Propagating changes to DNS servers to DHCP clients

I have a routed network with 8 subnets all served by a 3550 running a DHCP server. I have 8 dhcp pools set up, one for each subnet. Currently there are about 100 dhcp clients with leases across those subnets. I had to change the DNS server list for each of the dhcp pools. How do I ensure that the new DNS server info gets to all clients? Will the clients get updated DNS info by virtue of the changes I made to the dhcp pools, or do Ineed to wait until the leases are renewed for the changes to propagate? If so, short of having each client release/renew, is there a way to force the change? I know that I can start/stop the dhcp server which I believe will clear all bindings which then in turn will force all clients to get a new lease. Is there any other way to propagate the DNS change?

It should change automatically when you modify the parameters. No need to stop/start dhcp for that.
As as an alternative, it will certainly be updated when the clients are rebooted.
Best is to change it after office hours, systems will be updated when the users start their PC's in the morning.
regards,
Leo

Similar Messages

Multiple windows open in safari when click on web site. Also can't change/edit DNS servers or any other changes in advance window of network tab

macbook pro
osx - mavericks
multiple windows open in safari when click on web site. Also can't change/edit DNS servers or any other changes in advance window of network tab.
Basically every time i click on website other windows open and get redirected to other websites selling something (same as that mackeeper site which seems to open often) Really ***** as in just a few minutes on the web I have many windows open and many are the same pages. Can't make changes in the advanced tab of network as options are greyed out and the + & - symbols do nothing when clicked. Hope there is an easy answer as surfing net is really sucking right now

I hope to get some more info on a similar situation.
I have a new Mac Pro, less than 2 months old. OSX 10.5 updated to 10.5.2. Quicktime updated too. When I use the Desktop and Screen Saver system pref, I can easily select and use one of the Apple supplied desktop pictures as a desktop background.
But I wish to use a Photo from an iPhoto (iLife 08) folder / album as the desktop background. I can find all the albums, I can see all the icons for the pictures, I can select an iconed pciture and it appears in the top left of the preference pane (showing the effect of "fit to window" or "stretch to fit", etc). But all I get is a pale blue screen (which might be my default desktop colour). I don't get any of my iPhoto album pics to appear as a dektop background.
There is one minor note on this, I don't keep the pictures in my iPhoto Library, I just reference them, and the originals are on a different internal disk.
I've tried the suggestions above, trashing finder and desktop plists, killall Finder, etc. restart. Nothing gets it working again. It did work originally, for most of the time I've had the Mac Pro, then I changed the dektop to an Apple supplied picture of Earth.
This affects both an Admin, and a standard user. The photos (and enclosing folders) are read / writable by the admin user, and readable by the Standard user. Both users can easily access the photos in their iPhoto. They open the original files on the second internal drive, and performing a right click - Show File shows the original file as expected. I've even emptied the iPhoto library completely and rebuilt it, just in case there was an issue here.
Any ideas ? or anyone else seen this ? I don't really want to start reformatting disks and reinstalling the OS, but any suggestions short of this are extremely welcome.

Assigning 2 DNS servers to VPN clients

It seems like I can only assign 2 DNS servers to VPN clients using the "dns-server" command in config-group-policy? How do I go about assigning more than 2?
what exactly does dns server-group do? Can I use that command to assign dns servers to vpn clients since I can add more than 2 dns servers?

ciscoasa# sh run
: Saved
ASA Version 8.0(4)
hostname ciscoasa
enable password c.LHJMlCqC0Qvrsf encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
interface Ethernet0/0
speed 100
duplex full
nameif outside
security-level 0
ip address extip 255.255.255.240
interface Ethernet0/1
speed 100
duplex full
nameif inside
security-level 100
ip address 172.17.193.100 255.255.255.0
interface Ethernet0/2
shutdown
no nameif
no security-level
no ip address
interface Ethernet0/3
shutdown
no nameif
no security-level
no ip address
interface Management0/0
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
management-only
boot config disk0:/exit
ftp mode passive
clock timezone mst -7
clock summer-time mdt recurring
dns domain-lookup inside
dns server-group TA-UAT
name-server 44.44.44.102
domain-name ta.corp.adds
access-list split_tunnel_list standard permit 172.17.193.0 255.255.255.0
access-list split_tunnel_list standard permit 44.44.44.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 172.17.193.0 255.255.255.0 192.168.20.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 44.44.44.0 255.255.255.0 192.168.20.0 255.255.255.0
access-list inbound_on_outside extended permit icmp any any
access-list inbound_on_outside extended permit tcp any host extip eq 5555
access-list inbound_on_outside extended permit tcp any host extip eq www
pager lines 24
logging enable
logging asdm informational
mtu outside 1500
mtu inside 1500
mtu management 1500
ip local pool vpnuserspool 192.168.20.101-192.168.20.254 mask 255.255.255.0
no failover
icmp unreachable rate-limit 1 burst-size 1
icmp deny any outside
asdm image disk0:/asdm-613.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 44.44.44.0 255.255.255.0
nat (inside) 1 172.17.193.0 255.255.255.0
static (inside,outside) tcp extip 5555 172.17.193.96 5555 netmask 255.255.255.255
static (inside,outside) tcp extip www 172.17.193.1 www netmask 255.255.255.255
access-group inbound_on_outside in interface outside
route outside 0.0.0.0 0.0.0.0 extip 1
route inside 44.44.44.0 255.255.255.0 172.17.193.1 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
aaa authentication ssh console LOCAL
http server enable
http 192.168.20.0 255.255.255.0 inside
http 172.17.193.0 255.255.255.0 inside
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set firstset esp-3des esp-md5-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto dynamic-map dyn1 1 set transform-set firstset
crypto dynamic-map dyn1 1 set security-association lifetime seconds 28800
crypto dynamic-map dyn1 1 set security-association lifetime kilobytes 4608000
crypto dynamic-map dyn1 1 set reverse-route
crypto map mymap 1 ipsec-isakmp dynamic dyn1
crypto map mymap interface outside
crypto isakmp enable outside
crypto isakmp policy 1
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 43200
crypto isakmp nat-traversal 3600

How can I make Firefox recognise that I have changed the DNS servers to use?

After I edit /etc/resolv.conf to make my computer use more reliable DNS servers, Firefox doesn't notice until I restart it. How can I make Firefox notice the change without restarting it?

I discovered that I can do this by ticking Work Offline in the File menu, and then immediately unticking it again.
(I believe this mimics what would happen if the operating system disconnected and reconnected from a wireless network, which would be a situation where Firefox would need to check for new DNS servers. So that explains why it works.)

My modem works just fine, but my airport extreme refuses to connect to the internet. I even reset it more than once, changed the DNS servers and still nothing. Help

Ok so recently we were having problems with our phone. We had to disconnect our modem in order to fix the phone lines and when that happened, our airpot extreme disconnected itself from the internet. No matter what I did i could not get it to connect back. I would power down the modem, I would reset the AE and nothing would happen.
I tried changing the DNS server and nothing happened. I always get the same messages in the airport utility app: No internet connection and no DNS server
Nothing I seem to do works. I do know for a fact though, that the problem is not the modem. I have connected it through ethernet to other devices and the internet has worked just fine.
Please please please if anybody sees this help me out!!

Since you feel good about having internet access up to your Airport, I would suggest as a next step checking your Airport's status light to see if it is giving any clues as to what may be going on. Below is some info on what the light can indicate
AirPort Express Status light sequences and what they indicate.
No light (Off) - AirPort Express is unplugged
Solid green - AirPort Express is on and working properly.
Flashing amber - AirPort Express is not set up or cannot establish a connection to the network or
the Internet. Use AirPort Utility to find out the cause. See “If Your AirPort Express
Status Light Flashes Amber” on page 20.
Solid amber - AirPort Express is starting up.
Flashing amber and green - There may be a problem starting up. AirPort Express will restart

Pros and cons of changing DNS servers?

Hello guys, First of all I am a non technical person related to DNS servers. So I want to know what are the pros and cons if you change your DNS servers?
I wanted to access Netflix but its not yet available in my country so I came across http://unotelly.com/ . They provide a method to access but by changing DNS. Can someone guide should I do it? What are the pros and cons? Thank you

The DNS is what translates in and outgoing URLs to your local domain server. Changing it may have no adverse effect. It could result in faster or slower translations, but you may not even notice either. However, if it does not work properly, then you will not get web sites in your browser until you revert back to a DNS that you know works or delete all added DNS entries which returns to the system default.

Why doesn't my airport express router issue proper DNS server address to DHCP clients?

I have an Airport express router (version 7.6.4). It was configured to connect to internet via a cable modem, acting as a router with NAT. This means it obtians WAN address from cable modem, and in LAN it assumes IP address 10.0.1.1 as a gateway, and issue IP address to my 4-5 wireless clients (MBA, iPads, PCs) vi DHCP.
However I recently encounter an issue, that the router no longer issues DNS server address obtained from Cable Modem(206.x.x.x) but instead tell every DHCP client to use router ip address (10.0.1.1) as DNS server. I was pretty sure before Dec 2013 it is issueing (206.x.x.x) to all DHCP clients.
Apparently now the Airport express is acting as a DNS server or as a DNS cache. This works sporadically and very often result in long DNS look up or DNS look up failure.
Is this a bug or is it supposed to do so? Any configuration can turn it off so Airport express will issue Cable modem obtained DNS server to DHCP clients?
My network otherwise works fine. for some of the Clients (e.g. one MBA) I configured DNS for it mannually and it's internet is working very smoothly.

But this will be a problem for my ipad and iphone that uses wifi.
These devices either allow full DHCP. If you need to mannually enter DNS server, you will need to turn entire IP configuration to mannual and that will be a problem for me.

Script to Change DNS Servers on Remote Server

I am new to powershell and I am trying to construct a script to change the DNS servers settings on a whole list of machines remotely. I have the list of machines that I want to change in a txt file. I have read several posts on this and tried several different
methods but I cannot seem to get it to work. Here is my code, any help is much appreciated.
$servers = Get-Content C:\PathToFile\computers.txt
foreach($server in $servers)
    Write-Host "Connect to $server..."
    $nics = Get-WmiObject Win32_NetworkAdapterConfiguration -ComputerName $server -ErrorAction Inquire | Where{$_.IPEnabled -eq "TRUE"}
    $newDNS = "10.1.1.1","10.2.2.2"
    foreach($nic in $nics)
        Write-Host "`tExisting DNS Servers " $nic.DNSServerSearchOrder
        $x = $nic.SetDNSServerSearchOrder($newDNS)
        if($x.ReturnValue -eq 0)
            Write-Host "`tSuccessfully Changed DNS Servers on " $server
        else
            Write-Host "`tFailed to Change DNS Servers on " $server

http://blogs.technet.com/b/heyscriptingguy/archive/2012/02/28/use-powershell-to-configure-static-ip-and-dns-settings.aspx
Ed Wilsons Blog.
$computer = Get-Content C:\PathToFile\computers.txt
$wmi = Get-WmiObject win32_networkadapterconfiguration -computername "$computer" -filter "ipenabled = 'true'"
$wmi.SetDNSServerSearchOrder("10.0.0.15", "255.255.255.0")
I dont have the feasibility to check as of now. Please test and let me know.
Thanks
Azam
Mark As an Answer if it answered your question or helpful if helped.

Airport not distributing DNS servers over network

Hi everyone,
I connect to the Internet over ADSL (ISP: Arnet Highway, Buenos Aires, Argentina) using PPPoE from my MacBook Pro.
I have my ADSL modem connected to the Airport Extreme (802.11n) and distributing IP over DHCP just fine. Every device that joins the network obtains a valid IP.
However, DNS servers aren't distributed by the router over the network. Every connected device has to be manually configured to set the DNS servers of my ISP to be able to resolve hosts, instead of 'asking' these addresses to the router, as it should be.
Initially I thought there might be a problem obtainig the DNS servers from the ISP. So in the Airport Utility, in Internet / PPPoE settings, I've manually set my ISP's DNS servers, which should be distributed over the network to all connected devices.
This doesn't happen, and every somebody new joins my wireless network I have to manually change the DNS servers for that connection which, as I'm sure you'll agree with me, can be quite annoying. Not to mention what would happen if my ISP decides to use dynamic DNS addresses.
Thanks for any help you might provide.
Cheers.

Hello belbo,
I connect to the Internet over ADSL using PPPoE from my MacBook Pro.
Is your Macbook Pro Network configured to use PPPoE or DHCP?
I have my ADSL modem connected to the Airport Extreme (802.11n) and distributing IP over DHCP just fine. Every device that joins the network obtains a valid IP.
Is NAT enabled on the AE? Are the valid IP Address obtained from your ISP or from the AE?
However, DNS servers aren't distributed by the router over the network. Every connected device has to be manually configured to set the DNS servers of my ISP to be able to resolve hosts, instead of 'asking' these addresses to the router, as it should be.
When you setup the AE to use PPPoE did you enter a Domain Name or a DHCP Client ID?
Initially I thought there might be a problem obtainig the DNS servers from the ISP. So in the Airport Utility, in Internet / PPPoE settings, I've manually set my ISP's DNS servers, which should be distributed over the network to all connected devices.
The DNS servers listed in the AE aren't distributed to each Network Device but are only used to translate names into IP addresses when need by a Network Device.
This doesn't happen, and every somebody new joins my wireless network I have to manually change the DNS servers for that connection which, as I'm sure you'll agree with me, can be quite annoying. Not to mention what would happen if my ISP decides to use dynamic DNS addresses.
If your AE is distributing IP Address using DHCP and NAT then this should not be a problem but I'm not sure without more information about the questions I asked.
Later.
Buzz

DNS setup on portable clients

I have what must be an embarassingly simple problem. Unfortunately, I have not been able to locate an answer anywhere.
We have a simple wireless office network behind a DSL modem. The server is a new Mac Mini set up on one of the wireless router's ethernet ports, so it is not used as a gateway to the internet. The server is used for calendar sharing, the wiki functions, file sharing and the directory services.
The client computers are three MacBook Pros, all set up identically and all connected to the server.
The server has a fixed internal ip address, 10.0.0.7. When I first connected the client machines to the servers, the setup application added 10.0.0.7 as a DNS server in the AirPort settings. From what I understand, that makes perfect sense, since that is where the internal mapping is done to resolve the address for the iCal server and presumably also the other server functions.
However, when we take our computers out of the office and connect to other networks, this is way less than ideal. AirPort now appears to look for a DNS server at 10.0.0.7, which it obviously will not find. This causes long delays in all network access situations. Removing that DNS server entry immediately resolves the problem, of course, but I'd much prefer to have this change done automatically. Unfortunately, I can't find any way to automatically adjust the DNS server list depending on what network AirPort happens to be attached to at the moment.
As the observant reader will surely have noticed by now, I am very much a beginner in this world of clients and servers. Presently, we do not have a static ip address at work, so we can't access the office server externally.
Any advice would be very much appreciated.

Are you using DHCP for your client configurations? If so, you shouldn't need to set DNS servers in the clients - just let them take the settings from the DHCP server.
If you're not using DHCP then the classic solution to this is to create two Locations in System Preferences -> Network.
One of the Locations will have the settings for your office network, the other will have the settings for a public network. You'd need this anyway since the 10.x.x.x client address wouldn't be valid outside of the network anyway.
Once you have multiple locations you can switch between them via the Location menu in the Apple menu. If you want an automatic switch, check out Marco Polo which can make automatic Location selections based on heuristics like available wireless networks, date/time, and even connection peripherals.

WRT54G - won't display DHCP clients, won't let me change port forward

Just wondering if I need a new router....
It seems to never be able to display the DHCP clients table any more & when I try to forward a port to a connection, the table says it's forwarded, but it never actually changes it.
I upgraded the firmware to 8.00.7 (the latest for v8 hardware), did a hard reset and powered off to reset.
Still no luck....maybe it's just time for a new one?
Any suggestions welcome.
Thanks,
Eric

I just recently got the same issue in regards to the DHCP on my WRT610n. On windows XP a simple right click of the connection, and clicking repair forced windows to flush the DNS and renew them. After than the machine showed up in the DHCP list on the router again (I guess for some reason the leases suddenly stopped being renewed). Unfortunately this appears to of been removed in Windows Vista and been replaced by some kind of automated diagnose and repair system (If no problem is found it does nothing. Unhelpful).
However if you go to start > run > type "cmd" and enter to bring up the prompt, then type ipconfig /flushdns and then after it's complete type ipconfig /registerdns, that should force it to renew it's DNS from the router and it may show up in the DHCP table once more on the router. There's also a ipconfig /renew command that renews all adapters. If you wish to find out more about the ipconfig commands and what each of them does before doing anything, feel free to type ipconfig /?
Unfortunately I haven't found a way to get my router to keep renewing the leases as usual, so I guess this is just a temporary solution to part of your problem. As for the router going to the wrong IP, I was going to suggest DHCP reservation but I've just found out you don't have that, so instead I've found this quick thread that may / may not be helpful to you as it points out a few interesting rules that Linksys operates by: Click Here
As for the Port not forwarding, I'm not really sure, I'm just another user with issues of my own. I hope that one of the mods/staff/more knowledgable techi/person on this forum addresses your issues better than I have soon. Though isn't port 80 the default http port, and thus automatically open anyway? Can you even assign that port to anything? I thought it'd be reserved and thus not usable. Have you tried assigning a different port and forwarding that instead? But then again I'm not the most knowledgable of people =P

DNS record ownership for DHCP clients

my configuration:
dhcp/dns/dc installed on same system - Windows 2008 R2 SP1 in domain environment.
all zones configured to secure updates only with aging and scavenging enabled
dhcp servers are member of DNSupdateproxy group.
dhcp are configured with standard domain user account (this user was made a member of dnsupdateproxy as well, DOES THAT MATTER?)
dhcp scopes are configured with default DNS setup (force DNS update by DHCP)
now...
all DNS records for endpoint devices on dhcp lease (windows7, mac os X, ubuntu) are owned by SYSTEM
in security tab for some DNS records i can see service account with write permission to record ( i believe this is desired state)
in other records service account has no permission but timestamps are still updated by computer account (hostname$ has write permission). these records have pencil icon on computers in dhcp lease table.
Problem with this (hostname$ has write permissions) is when user connect to network via VPN (obtains dhcp lease) it get's two records registered in DNS -> 1 record for ip distributed by dhcp server and 2nd record for his home private network.
Have anyone seen this before?
i've tried deleting DNS records / releasing ip on endpoint device (example win7). It would not register to DNS by DHCP. However if i do ipconfig /registerdns it will do it, but dhcp service account won't have permission no this record.

Apparently it appears that DHCP may not be configured with credentials, DHCP DNS settings are not configured to force DHCP to register ALL requests, nor has the DHCP server itself have been added to the DnsUpdateProxy group. These are all prerequisites
for DHCP to own all records, otherwise you will see default behavior, which is:
By default, a Windows 2000 and newer statically configured machines will
register their A record (hostname) and PTR (reverse entry) into DNS.
If set to DHCP, a Windows 2000 or newer machine will request DHCP to allow
the machine itself to register its own A record, but DHCP will register its PTR
(reverse entry) record.
The entity that registers the record in DNS, owns the record.
In summary:
Configure DHCP Credentials. The credentials only need to be a plain-Jane, non-administrator, user account. Give it a really strong password.
Set DHCP properties, DNS tab, to update everything, whether the clients can or cannot.
Add the DHCP server(s) to the Active Directory, Built-In DnsUpdateProxy security group.
Make sure ALL other non-DHCP servers are NOT in the DnsUpdateProxy group. For example, some believe that the DNS servers or other DCs not running DHCP should be in it. They must be removed or it won't work.
On Windows 2008 R2 or newer, DISABLE Name Protection.
If DHCP is co-located on a Windows 2008 R2 or Windows 2012 DC, you can and must secure the DnsUpdateProxy group by running the following:
dnscmd /config /OpenAclOnProxyUpdates 0
Configure Scavenging one one DNS server. Set the NOREFRESH and REFRESH values combined to be equal or greater than the DHCP Lease length. What it scavenges will replicate to others anyway.
DHCP Service Configuration, Dynamic DNS Updates, Scavenging, Static Entries, Timestamps, DnsUpdateProxy Group, DHCP Credentials, prevent duplicate DNS records, DHCP has a "pen" icon, and more...
Published by Ace Fekay, MCT, MVP DS on Aug 20, 2009 at 10:36 AM 3758 2
http://msmvps.com/blogs/acefekay/archive/2009/08/20/dhcp-dynamic-dns-updates-scavenging-static-entries-amp-timestamps-and-the-dnsproxyupdate-group.aspx
Good summary:
How Dynamic DNS behaves with multiple DHCP servers on the same Domain?
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/e9d13327-ee75-4622-a3c7-459554319a27
DNS Record Ownership and the DnsUpdateProxy Group
http://technet.microsoft.com/en-us/library/dd334715(v=ws.10).aspx
DNS Record Ownership and the DnsUpdateProxy Group
"... to protect against unsecured records or to permit members of the DnsUpdateProxy group to register records in zones that allow only secured dynamic updates, you must create a dedicated (NON-ADMIN) user account and
configure DHCP servers to perform DNS dynamic updates with the credentials of this account (user name, password, and domain). Multiple DHCP servers can use the credentials of one dedicated user account."
http://technet.microsoft.com/en-us/library/dd334715(WS.10).aspx
DNS record ownership and the DnsUpdateProxy group
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/b17c798c-c4b2-4624-926c-4d2676e68279/
Ace Fekay
MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/
This post is provided AS-IS with no warranties or guarantees and confers no rights.

Client workstations point to ISP's dns servers

My single DC is also my DHCP/DNS server. The workstations are all set to acquire dynamic IP address from the DHCP server and everything seems to work fine except that the workstations get the IP address of our ISP's DNS servers.
Is there a way to find out from where these workstations are acquiring the DNS settings?
I am adding the ipconfig /all result from a client PC below.
Windows IP Configuration
   Host Name . . . . . . . . . . . . : <hostname>
   Primary Dns Suffix . . . . . . . : <domain name>
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : <domain name>
Ethernet adapter Local Area Connection:
   Connection-specific DNS Suffix . : <domain name>
   Description . . . . . . . . . . . : Intel(R) 82578DM Gigabit Network Co
on
   Physical Address. . . . . . . . . : 6C-62-6D-E6-D6-04
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::5009:c404:b075:a49f%12(Prefer
   IPv4 Address. . . . . . . . . . . : 192.168.5.10(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Thursday, April 10, 2014 9:12:28 PM
   Lease Expires . . . . . . . . . . : Sunday, April 13, 2014 9:12:26 PM
   Default Gateway . . . . . . . . . : 192.168.5.1
   DHCP Server . . . . . . . . . . . : 192.168.4.248
   DHCPv6 IAID . . . . . . . . . . . : 275538541
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-B5-78-62-6C-62-6D-E6
   DNS Servers . . . . . . . . . . . : 212.77.192.59
                                       212.77.192.60
   NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter isatap <domain name>
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . : <domain name>
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 9:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Microsoft 6to4 Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 11:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Ok, thank you. Two other things to check... Are there any servers on the network that used to serve as DHCP server? A long shot... But always worth a double check. Secondly, looking at your IP settings, your server and clients sit on different subsets.
I assume you have IP helper / DHCP relay agent in place to point to the DHCP server. If that's the case, it's worth checking the config on those and/or restarting the devices.
MCTS, MCSE 2000/2003, MCSA 2000/2003, CNA

Domain Controllers that are DNS servers DNS Client settings

[Copying verbatim from a mail by Joe ]
So I have been pinged by a few folks recently on configuration of client DNS settings on Domain Controllers that are also functioning as DNS Servers. Lots of debate. I understand there has been long time debate within MSFT as well.
From http://blogs.technet.com/b/askds/archive/2010/07/17/friday-mail-sack-saturday-edition.aspx there
is the quote
"3.When referencing a DNS server on itself, a DNS client should always use a loopback address and not a real IP address."
From http://www.microsoft.com/en-us/download/confirmation.aspx?id=9166 (Windows
Server 2008 R2 Core Network Guide)
"9. In Preferred DNS server, type the IP address of your DNS server. If you plan to use the local computer as the preferred DNS server, type the IP address of the
local computer.
10. In Alternate DNS Server, type the IP address of your alternate DNS server, if any. If you plan to use the local computer as an alternate DNS server, type the IP address of
the local computer."
From http://technet.microsoft.com/en-us/library/dd378900(v=ws.10).aspx (DNS:
DNS servers on <adapter name> should include their own IP addresses on their interface lists of DNS servers)
"The inclusion of its own IP address in the list of DNS servers improves performance and increases availability of DNS servers. However, if the DNS server is also a domain controller and it points only to
itself for name resolution, it can become an island and fail to replicate with other domain controllers. For this reason, use caution when configuring the loopback address on an adapter if the server is also a domain controller. The loopback address should
be configured only as a secondary or tertiary DNS server on a domain controller...
Add the loopback IP address to the list of DNS servers on all active interfaces. The loopback IP address should not be the first server in the list."
ESPECIALLY "For this reason, use caution when configuring the loopback address on an adapter if the server is also a domain controller. The loopback address should be configured only as a secondary or tertiary
DNS server on a domain controller." and "Add the loopback IP address to the list of DNS servers on all active interfaces. The loopback IP address should not be the first server in the list."
Why shouldn't loopback not be first, the justification is why you shouldn't only use loopback, not why it shouldn't be first.
From http://technet.microsoft.com/en-us/library/ff807362(v=ws.10).aspx (DNS:
DNS servers on <adapter name> should include the loopback address, but not as the first entry)
"If the loopback IP address is the first entry in the list of DNS servers, Active Directory might be unable to find its replication partners.
The inclusion of its own IP address in the list of DNS servers improves performance and increases availability of DNS servers. However, if the DNS server is also a domain controller and it points only to itself,
or points to itself first for name resolution, this can cause a delay during startup. For this reason, use caution when configuring the loopback address on an adapter if the server is also a domain controller. The loopback address should be configured only
as a secondary or tertiary DNS server on a domain controller."
This also seems like justification against only using loopback versus using it first.
Are there any actual real documented issues for using loopback first and a remote DNS server second and perhaps third? If the local DNS server service isn't working yet (or at all), I would expect the DNS Client process
to try to connect to it, fail, and then failover to the secondary just like I would expect it to failover if the remote DNS server was secondary and it was unavailable and it failed back to the loopback. Am I making a bad assumption?
And by documented I don't mean random responses to questions on the internet or other such items. I mean a KB article or technet article or properly researched and tested other web article from a reliable resource.
thanks,
joe

As I understand it, the scenario whereby a DC could become an 'island' if it points only to itself, or to itself first, was repaired in the Windows Server 2003 product cycle. See
http://support.microsoft.com/kb/275278 for information about this scenario.
However, there is still a known problem of slow boot times that can occur. See
http://support.microsoft.com/kb/2001093 for information about this. The scenario that is discussed assumes there is a power failure and servers shut down due to overheating while on backup power. When
multiple servers come online simultaneously after power is restored, there can be a significant delay.
The recommended configuration is one that avoids a single point of failure, but also tries to optimize the speed of resource record registration, so that Active Directory can properly synchronize.
-Greg

Changing dns servers vs cname

I'm confused...I'm using iweb 2.0.3, I've published my pages to .mac, and now I want to have my website name (www.stoneaxefarm.com) which I purchased through Register.com point to those pages on .mac rather than to the servers someplace in Tennessee where my site is currently residing.
Register.com wants me to enter the new dns servers...there's nothing about cnames.
the current dns looks like : ns57.1and1.com do I replace that with www.mac.com/myusername/etc?
then how do I get my mail that currently is forwarded from [email protected] to [email protected]?
Thanks, Martha H.

Register.com wants me to enter the new dns servers...there's nothing about cnames.
It's in the Help
[How do I change mu Domain alias|http://help.register.com/cgi-bin/registerhelp.cfg/php/enduser/std_adp.php?p_faqid=1270&p_created=1097608669&p_sid=maCHzq5 j&p_accessibility=0&p_lva=1252&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZw X3Jvd19jbnQ9NCZwX3Byb2RzPTAmcF9jYXRzPTAmcF9wdj0mcF9jdj0mcF9wYWdlPTEmcF9zZWFyY2hf dGV4dD1jbmFtZQ**&p_li=&ptopview=1]

Propagating changes to DNS servers to DHCP clients

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