DNS forwarder with 2 real DNS servers, querying them simultaneously

DNS forwarder with >2 real DNS servers, querying them simultaneously and ignoring "server can't find" errors
Hi. When I connect to VPN, my normal DNS isnt queried, and DNS given by VPN answers: "server can't find"
An extract from 'man resolv.conf'
If there are multiple servers, the resolver library queries them in the order listed.
I need another logic. All servers should be queried at the same time, and the soonest positive reply should be used.
The algorithm used is to try a name server, and if the query times out, try the next, until out of name servers, then repeat trying all the name servers until a maximum number of etries are made.
So, if I get "server can't find" error, the next DNS server not queried. I want the DNS forwarder to ignore such answers and wait for replies from other servers.
What software can do this? Maybe dnsmasq? I plan to add 'nameserver 127.0.0.1' to the top of my resolv.conf and configure my scripts to add other nameservers below.

All servers should be queried at the same time
--all-servers
dnsmasq: ignoring nameserver 127.0.0.1 - local interface
good.
How to tell dnsmasq to completely disable dhcp? List all interfaces like this?
no-dhcp-interface=eth0
no-dhcp-interface=tun0
no-dhcp-interface=vboxnet0
no-dhcp-interface=wlan0

Similar Messages

How to prevent Mac DNS registration with W2K3 DNS

I have a Mac with two ethernet cards. The Mac is bound to a W2K3 AD and presents LAN services via one card (LAN IP). The other card is connected to a non-routed separate network used for other purposes (Private IP).
The Mac registers its forward lookup A record in the AD DNS twice, once with the wanted LAN IP address and once with the unwanted Private IP.
The Private IP address is not reachable by clients so I don't want it to register. Because of the round robin nature of AD DNS, it serves out the wrong IP address to 50% of LAN clients, who then fail to connect.
On Windows, it is possible in the GUI to specifically set a network card's properties not to register with the DNS. On the Mac this setting is absent in the GUI.
I assume there is a setting I can throw from terminal to block dynamic DNS registration for a specific ethernet card, whilst retaining it for the one I want. But I cant find it.
Can anybody point me in the correct direction please?

I think you will have a better chance of seeing your problem solved if you post on the XServe or Server forums.

HT201269 I got a new iPhone and want to know how I can get my progress back on my Game Center games? Some with real money purchases in them

Is it possible to get you old game progress back when you changed to a newer device on gamecenter games?

Good luck getting help with that attitude.

DNS Issues with Hyper-V 2012 R2 VDI Pooled Desktop Deployment

Good afternoon all!
We are running a POC VDI deployment on a Nutanix system, and I am having a DNS issue. I would appreciate some help trying to figure this out. Two situations that are causing issues that I can see:
1. VMs go into a saved state if not being used: This in itself is not an issue, and I see it as a way to save resources not being used; however, if a VM is saved for a few days, the DHCP address often gets reassigned. Now if users are connecting, and that
saved VM with the stale address is called to wake up, the VM is not found.
2. Recreating the pool after updating the golden image: This is the bigger issue. After a couple days of running smoothly, I was asked by my pilot users to add Firefox. I installed it and recreated all the VMs in the pool. When this happened, they all got
new IPs, but the old DNS records were not updated. This made the broker unable to find a single VM in the pool. I could not ping a single one.
Has anybody else run into these DNS issues with a VDI deployment? If so, what did you do to resolve it? If not, have any ideas on what is going on here?
Thank you in advance!
Eric

Hi Eric,
As per my research, I can say that the default behavior. When we will recreate the VM it will change the IP address dynamically. But from your description it seems the DNS record is not getting update and due to that you can’t find your VM with hostname or
IP. But for this you can set one option under DNS server with which DNS record can update the new IP address. The option you need to set is “Dynamic updates>Nonsecure and Secure” under general properties in sites. You can check below snap.
Hope it helps!
Thanks.
Dharmesh Solanki
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Update Policy for multiple networks with specific DNS servers

I have a mid size network with 5 locations all with different IP addresses. All sites host their own DNS servers and connect directly through an ISP dedicated VLAN.
Main Site
10.1.1.1
255.0.0.0
Remote Site 1
192.168.100.1
255.255.255.0
Remote Site 2
192.168.101.1
255.255.255.0
Remote Site 3
192.168.102.1
255.255.255.0
Remote Site 4
192.168.103.1
255.255.255.0
All sites can be managed through the main site, but have their own DNS servers on location.
My purpose is to point all computers and devices to a new DNS server from their previous static assignment. (XP and later versions)
My question is can I use GP or DHCP* to push DNS server information to each device making them site specific without having to travel to those locations?
Requirements:
All devices on 10.1.1.1 will be changing from 10.1.1.2 to 10.1.1.4 (decom of old 2k3 server)
DNS servers at each 192 location will need to point secondary server to 10.1.1.4
Devices at main will need to use 10.1.1.4 as primary and 10.1.1.3 as secondary.
Devices at each site will need to keep their respective DNS server.
*If I use DHCP to change the information on a per scope level, can I use GP to force computers with locally set static assignments to update to DHCP static assignments
Bonus: If anyone can give me an estimate on how much network traffic/bandwidth this would create that would be great because I would consider staggering the assignments as I am a 24 hour business.

Hi,
You may configure a Scheduled Task Item in Group Policy.
To create a new Scheduled Task preference item, please follow the steps below,
Open the Group Policy Management Console . Right-click the Group Policy object (GPO) that should contain the new preference item, and then click
Edit .
In the console tree under Computer Configuration or
User Configuration , expand the Preferences folder, and then expand the
Control Panel Settings folder.
Right-click the Scheduled Tasks node, point to
New , and select Scheduled Task .
In the New Scheduled Task Properties dialog box, select an
Action for Group Policy to perform. (For more information, see "Actions" in this topic.)
On the Task tab, enter task settings for Group Policy to configure or remove. (For more information, see "Task settings" in this topic.)
If creating, updating, or replacing a task:
Click the Schedule tab, and configure one or more schedules for the task. (For more information, see "Schedule settings" in this topic.)
Click the Settings tab, and enter any additional task settings for Group Policy to configure. (For more information, see "Other scheduled task settings" in this topic.)
Click the Common tab, configure any options, and then type your comments in the
Description box. (For more information, see
Configure Common Options.)
Click OK . The new preference item appears in the details pane.
In the task, you may use netsh to set the DNS address.
netsh interface ip set dns name="Local Area Connection" static yourdnssetting
Here is an article about netsh command,
http://technet.microsoft.com/en-us/library/cc738592(v=WS.10).aspx#BKMK_5
Hope this helps.
Steven Lee
TechNet Community Support

What is going on with the DNS servers?

I've been having intermittent connection problems with "DNS Server Not Responding" identified as the error by Win 7 troubleshooting for a little while now.
This has been sporadic for a couple of months and usually resolves itself after a short time, but in the last few days I've barely been able to access the internet at all, with the exception of a handful of websites and today it came to a head and I could only access a couple of websites for most of the day.
Thankfully I finally managed to find a website that I could access to remind myself of the addresses for the free google DNS servers and am now back online.
Just wanted to stop by to report the issue and ask What on earth is going on with BTs DNS servers?

Hi Epona222,
Thanks for posting. There are no reports of any specific issues with DNS servers but I can check your connection etc for you if you wish. Drop me an email with the details. You'll find the "contact us" form in the about me section of my profile.
Cheers
David
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry but we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)

Obtaining DNS servers automatically on Cisco ADSL routers;" not static dns with command dns-server x.x.x.x" ?

Obtaining DNS servers automatically on Cisco ADSL routers;" not static dns with command dns-server x.x.x.x" ?

Ok Thank you Karsten

DNS set-up for multiple servers?

I need some DNS advice....
I am replacing our old OS Leopard server (that provided web hosting, email, file serving, dns, etc.) with four new Mac Mini Servers (Maverick) to distribute the services. We had an issue on the old machine's fileserver service that brought all services to a halt and then the employees to a halt.
Since one machine was the central hub of everything it was easy to set-up the DNS to point to it for everything. Now that I have four machines (one of them serving the DNS) I need to know how to point to the other services. The DNS user interface only allows me to input DNS infer for that particular server. How do I add names and address in the DNS to point to the other three servers?
Thanks in advance.
Brian

To add to MrHoffman's advice, as long as the two machines have different IP addresses, they will only know about each other if you tell them.
For example, server.gilliland.com is running Leopard and is at address 172.16.0.10. You want a new device to also be know as server.gilliland.com but don't want to shut the other one down. Ok, give it another address, 172.16.0.11 for example and define on it DNS that points server.gilliland.com to 172.16.0.11. As far as the new server knows, it is server.gilliland.com and is start of authority for the gilliland.com domain. The old server thinks the same thing. But as long as you don't tell either about the other, they will live happily in the belief that they are the one and only server.gilliland.com server.
Now, as longs are you are already relying on DNS (meaning nothing is linked via IP), then you can completely build you entire new OD cluster while the old systems is still running. DHCP will tell everyone to use DNS from the old server. You new servers will be configured with new DNS and they will all be in on the new secret. When you are ready to make the migration to the new cluster, change DHCP and push new DNS out to the clients. As long as they connect by name (server.gilliland.com) they will not miss a beat.
Depending on your services, this can be done with almost no downtime. Got lots of data? rsync it. The biggest headache you will have is likely the mail migration. That is a torture I wish on no one. Make sure you have a backup plan, a regression plan, a head for the border plan, and then an alternate plan for when all of those plans fall apart. I also suggest closing your port forwards on the firewall when you decide to move mail. This will allow you to validate the migration without new mail coming in. Thus, if something goes wrong, but not completely "the sky is falling" wrong, then you can restore the old server, open the firewall, and live to try again another day.
Reid
Apple Consultants Network
Apple Professional Services
Author "Mavericks Server – Foundation Services" :: Exclusively available in Apple's iBooks Store
Author "Mavericks Server – Control and Collaboration" :: Exclusively available in Apple's iBooks Store

Real DNS on a OS-X Server not the cached version in 10.5 & 10.6

For the last year or so i have been running tenon.com itool9.05i on two Mac minis while I was running Leopard Server then Snow Leopard Server on two more mac minis. The 4 CPU idea worked well but I have been wishing I could just put DNS on my two Snow Leopard Servers and use my other two minis for other projects.
Well I found a way of doing just that and it was only mildly painful in the learning curve.
When you get ready to do the following please remember this has nothing to do with the Macintosh side of things so the IP address of your two name servers CAN NOT be defined in your Mac's Network Control Panel. CAN NOT...
1. Download VirtualBox from Oracle.
2. Download ubuntu-10.04-server-i386 this is the 32bit server version of Ubuntu.
I highly recommend you only install DNS (BIND9) server and do not add a GUI but instead add WEBMIN and admin your new server from Safari on the Mac side.
Go here and print out this very short tutorial:
http://sourceforge.net/projects/webadmin/forums/forum/600155/topic/3694824?messa ge=8385678
The 2nd line is going to be added to the file you opened in the first line.
The 4th line is a command so type it in exactly.
When the install completes just leave your Ubuntu Server running and jump into Safari or FireFox and type in the IP of your server as follows:
https://xxx.xxx.xxx.xxxt:10000/
When you get DNS setup you will be typing in:
https://ns1.my-server-name.com:10000/
You may want to change the port from 10000 to something unusual.
You will have already setup a Ubuntu username and password so use them. Do not worry about the self signed certificate as it is your own server and it is you going in.
I do love my OS-X Servers but I hated not having real DNS so this is my workaround.

I'm not clear what problem you're trying to solve here -- the DNS server in both Leopard and Snow Leopard server is BIND, and as far as I know isn't crippled ("cached"?) in any way. The Server Admin UI certainly doesn't expose all of BIND's configuration options, but you can use other management methods -- including using [webmin|http://www.webmin.com/osx.html] -- as long as you're careful to do config that Server Admin doesn't understand in files it doesn't look at (e.g. add resource records to the files in/var/named/, not the ones in /var/named/zones/).

Help with Proper DNS Setup for Leopard Standard Server Setup

Hello All,
Problem Description-
I was reviewing some training today on DNS setup and checking for proper setup with the sudo changeip - checkhostname tool and I seem to have an incorrectly configured DNS setup. So I need some help on correcting it. When I go to the "Server Preferences" tool I cannot log in using apple.ourdomainname.com instead in order to use the tool I have to input localhost as the server name. Now I just thought that the system was broken or something and with the help of my training I now see it's a DNS problem. I thought I had everything proper since I followed the steps of creating proper DNS/RDNS entries with my ISP. Now I am stuck wondering what else isn't working properly due to the DNS issue. Thanks in advance.
Technical Info-
My ISP provides us with 5 static IP's and we have asked them to create entries and verified the setup of apple.ourdomainname.com = x.x.x.x which is one of our public IP's assigned currently assigned to the WAN port of our Apple Airport Extreme. We have also had them create a PTR record which also is present, verified and functional. Our MacMini running 10.5.5 is connected directly to one of the ethernet ports on our Apple Airport Extreme which is our NAT/Firewall for the LAN. So during the setup of the Standard Server install the OS configured the Airport with the required ports for chat/web/vpn. And mobile Mac's can VPN in and gain folder access and web works fine too. We don't use the e-mail portion so I can't say how that works. The server is using the DNS of 10.0.200.1 which is the IP of the Airport and the airport is programmed with the DNS of OpenDNS servers 208.67.222.222 and 208.67.220.220. The reason for this whole long shpeal is that I want to give as much technical background as possible for the best possible help.
Thanks
DM

What happens when you use 'Localhost' instead of 'localhost' (i.e. capitalizing the 'L')?

External DNS zone on Internal DNS servers

We currently have a 2 domain forest with DNS running on all domain controllers. All domain controllers are 2012 or 2012 R2 and our Domain and forest functional level is set at 2008 R2 due to the existence of an exchange 2003 server which wont be retired
for several months. We have 2 DNS servers in the root domain and 4 DNS servers in the child domain. This is a centralized DNS setup. Our parent domain is DOMAIN.LOCAL and the child domain is XX.DOMAIN.LOCAL. Externally, our DNS is MYDOMAIN.com. we
do not have a public facing DNS server and our DNS records are hosted by a 3rd party
We want to add the MYDOMAIN.COM DNS zone internally (AD Integrated) since we have several instances where applications do not really work well with the XX.DOMAIN.LOCAL DNS. We want this zone to host several DNS records for internal resolution
only since we do not have any public facing applications or web servers such as SharePoint etc.
My question(s) is this?
How is the best way to do this and how will it affect the zones we currently have in place.
Is it as simple as creating a new forward lookup zone, adding static records?
How do we (or do we) handle delegation?
Any information or suggestions to get me started would be greatly appreciated.
Russ

Hi,
I’m not quite understand your question, do you want to create a new primary DNS zone on your current DNS server? If so, you
just need to create a new primary, you can create the additional primary DNS zone.
The related KB:
Configuring a new primary server
http://technet.microsoft.com/en-us/library/cc776365(v=ws.10).aspx
Hope this helps.
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Bit Torrent port forwarding issue and DNS resoluti...

Good morning comunity!
Something odd has happened and I was hoping for some further guidance as I'm not sure what my next steps are.
Background
I have uTorrent running on a a machine that accesses a private RSS feed of torrents I am watching. The client sees a new file posting and automaticlly downloads the .torrent file then proceeds to download the main file itself.
When I had BT installed back on 23 Decemeber I set up port forwarding to this machine, using a static IP, and there were no connection issues.
What has happened
The previous evening as I was going to bed I checked the machine and the active torrents and all my files were sitting at 0 connections for connected seeds & peers. Meaning that uTorrent wasn't able to see anyone to conenct to.
My Troubleshooting
After seeing the above I began checking my connections and set up on the router as well as the machine. uTorrent has within its preferences a port checking utility for its assinged port and that was showing no open connection. I then logged in to my HH4 and verifed my port forwarding rules: nothing had changed there.
I removed and re-added the rules, turned off UPNP as well as turned it on with no success. And during the process of adding the rule back into the system I recieved an error stating that the port was already assigned even though at that moment there were no active assignments. So I changed port numbers and the issue went away.
I then went to chack the private torrent site and the page would not display. Then went to Down For Everyone Or Just Me to check the site as well and it was reported as being up. I loaded my VPN connection to bypass BT's network and I was able to visit the site. Logged back out and did a trace and the trace reported to route to the site. Changed my DNS to Google's DNS setting and was able to access the site.
Where I am now
My torrent machine is now running via the VPN but it's not the best connection in the world as changing the DNS there did not resolve the torrent connection issue.
Does anyone, especially you folkd familar with BT and their practices, have reccomendations as to what to try next or what the issue may be?

A lot of torrent sites are starting to be blocked. Its possible the site in question is being blocked by BT(They have no choice in this as its being forced onto them by a court order same for most of the other big ISPs). If its being blocked you would still be able to access via a VPN so long as thats not being blocked too. In terms of what you can do about it not much other than keep using the VPN.

10.4 DNS forward

I just upgraded to 10.4 from 10.3 and it has killed my DNS forwarding. I set it up in 10.3 with Server Admin but in 10.4, Apple in their infinite wisdom, decided that that forwarding was a bad thing and removed it from the GUI. Worse yet: it overwrote my working DNS files.
Now I am at the point that DNS forwarding does not work and I do not know how to fix that. I do not even know what files I should modify. Here is what I do know:
zone "xyz.com" IN {
type forward;
file "fwd. xyz.com";
forwarders {10.0.6.32; 10.0.6.36;};
The forward is over a VPN.
Can anyone help?
TIA,
Dan
Loud Fan XServe Mac OS X (10.4.3)

The following is taken from a working /etc/named.conf file:
// Include keys file
include "/etc/rndc.key";
// Declares control channels to be used by the rndc utility.
// It is recommended that 127.0.0.1 be the only address used.
// This also allows non-privileged users on the local host to manage
// your name server.
// Default controls
controls {
inet 127.0.0.1 port 54 allow {any;} keys {
"rndc-key";
options {
directory "/var/named";
forwarders {
xxx.xx.1.10;
xx.xx.100.10;
Meh.... there's whitespace in there that gets ignored by this (Apple's) forum software.
You should - of course - only use forwarding to DNS servers you should be using (eg: your ISPs)

Unable to create DNS forwarder in my AD integrated DNS

Hi,
I have my mix AD servers (2003 + 2008) and im trying to create DNS forwarder to send requests to outside the Domain over natted IP for the name resolution. However, it works perfectly fine in my test environment.
Now, when i try to create on my production server, i get below error:
The operation requested is not permitted on the root DNS server
Please suggest.

Hi, it is worth checking if you have got a root (period) forward lookup zone. If you have, you will need to remove that before you can setup a forwarder. Hope this helps. If in doubt, please post some details of your forward lookup zones (with fake names).
Thank you
MCTS, MCSE 2000/2003, MCSA 2000/2003, CNA

Server 2008R2 with AD DNS Panel not showing any records only shows the zone name

Hi All new to the Form. We have had this new domain controller running dns for a few years now and recently I went to edit some DNS records and found them missing in the DNS console the zone names are there but nothing is under the zones just one record
for the server under our AD domain. If i do a nslookup to this server it still displays the records as it should. It is also setup to forward the zones to a secondary server which is only pulling info from this Master 2008R2 server. Any ideas where i can try
and recover the records for my Zones.
Thanks

Hi,
According to your description, there are several possible reasons resulting in the DNS records disappearing.
1. If the aging and scavenging was configured in the DNS server, scavenging can cause records to disappear. Even Windows-based computers that have statically assigned servers register their records every 24 hours. Verify if the
No-refresh and Refresh intervals are too low. For example, if these values are both less than 24 hours, then we will lose DNS records. To view the settings, right-click the zone in the DC, click
Properties, click Aging.
2. Is there a DHCP server in your environment? DNS Dynamic Update Protocol updates to existing records fail can also cause them to be deleted by the scavenging process as aged records.
Also, event logs are helpful to isolating the issues. Is there any event logs in your computer?
For more details about DNS records disappearing, please refer to the link below,
DNS Records Disappearing and DNS Auditing
http://msmvps.com/blogs/acefekay/archive/2010/12/09/dns-records-disappearing-and-dns-auditing.aspx
Using AD Recycle Bin to restore deleted DNS zones and their contents in Windows Server 2008 R2
http://blogs.technet.com/b/askds/archive/2010/08/12/using-ad-recycle-bin-to-restore-deleted-dns-zones-and-their-contents-in-windows-server-2008-r2.aspx
Best Regards,
Tina

DNS forwarder with 2 real DNS servers, querying them simultaneously

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