Why do DNS servers log in to my Router ?

When I check the IP address of the computers logging in to my Wireless Router, I sometimes see two DNS addresses (DNS addresses from my internet Service provider) logged in. DSoes that mean that I am being hacked ?
Thanks for any information.

DNS servers are more of a personal preference. ISP's will often distribute routers with thier own DNS servers. This means you go through them to find any other website/ip address. You will have no problems if you have a working internet connection (Default Gateway is important for this) and have different (but valid) DNS servers on every device.
People sometimes use Primary 8.8.8.8 Secondary 8.8.4.4. These belong to google so should pretty much resolve anything and can default searches to google.
Most routers will push out themselves as the default gateway and the dns server. For example, on a Linksys router (IP address is 192.168.1.1) the router will use 192.168.1.1 as the DNS server. This is fine, and normal. This just means it's added itself to the dns path. This means you will be able to resolve internal IPs (other devices on your own network).
You may need to contact D-Link for further configuration on their router's DNS settings.

Similar Messages

If your Airport is connected but you can't surf, check your DNS Servers

I just had 2 customers who upgraded their OS's to 10.6 and it stuck 2 DNS servers in their network settings, 65.106.1.196 and 65.106.7.196. Delete them and if your computer is set to DHCP, it'll acquire the correct DNS servers from your modem or router. You can find them in "Advanced".

Finally got it fix and setup!
How I did it:
1) Turn on AEBS, press and hold on reset button for 5 sec.
2) Turn off AEBS after its initialization. (only center light permanently ON)
3) Turn on iMac.
4) Remote all KeyChain files related to AirPort. AEBS is still off.
4) Update AirPort software to v4.2
5) Update AirPort Extreme card dirver to v1.0 (update 2005-001)
6) Restart iMac and login then Turn on AEBS.
7) Pop-up shows "Apple Network as980510" is found, click OK.
8) Run AirPort Setup Assistant from Application/Utilities
9) Update AEBS firmware to v5.7
10) After AEBS restart successfully, fine its configuration accordingly.
11) Set dial-up ISP parameters and click Update
12) At iMac System Preferences>Network click 'AirPort' then 'Configure'
13) At 'AirPort' tab, change 'By default join' to 'Preferred Networks' and choose the one defined at step 8.
14) At 'Proxies' tab, checked 'Web Proxy (http)', 'FTP Proxy' and key in ISP's proxies according.
15) Launch Safari and start surfing.
Because I have missed out step 12-14, that causes me hours of troubleshooting and late night sleep. Finally.... it works and I'm confident it's solved. Hope it will help some of you out there! Cheers!

Unix command in ARD to remove DNS Servers from Network prefs?

I need to know how to send a unix command to remove DNS Servers in Network preferences. I need the DNS Servers field to be blank. Can this be done?

Our network administrator is getting ready to change the IP address of our DNS server. This means I have over 30 Macs that will be needing changes to their DNS settings. Since each machine is setup with limited access to the system prefs, that means I have to go to each machine and log in as the admin user to make this change. In the interest of saving time, is this something I can do with Remote Desktop and how? Would I use the same commands in this post and replace dns1 with our DNS' new IP address? Will this distrupt the users access to the network when I do so?
Thanks for any help.
Beth

Why can't i log into my facetime or ichat

i can login into my apple id just fine on my phone but when i try to on my macbookpro i cant. same goes with my ichat. please help

Hi,
You say FaceTime and iChat which suggests Lion (OS X 10.7.x) as you operating system.
That means that your Apple ID can be used in FaceTime on both the iOS device and the FaceTime app on the Mac.
In iChat the Apple ID will only be a Valid AIM Name but the password does need to be 16 characters or Less to work with the AIM servers.
I would start by adding a Public DNS Server IP address to the System Preference > Network > Advanced Button > DNS tab
Google run 8.8.8.8 and 8.8.4.4 which seem to be able to 'find" the two Apple Server involved if your ISPs DNs servers can't.
I would then check System Preferences > Security > Firewall and make sure it is allowing iChat and FaceTime.
9:16 PM Friday; March 1, 2013
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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

DNS debug logging to determine if 2008R2 DNS server is still being queried?

We are removing multiple DNS servers. We have removed those servers from DNS reference from all dhcp scopes, and ran script across all windows servers to make sure they are not being used. There still might be Linux/telecom/workstations manually
set that we do not know about, so I was going to use debug logging just to look for queries that are coming and to try and determine where they came from. I have debug logging set to log packets for Incoming, UDP, Queries/Transfers, and Request, but having
trouble figuring out this log. Here is an example of what I am seeing. Does anyone have a reference for this? I am having trouble finding one.
Is this saying that a computernamed POS188 made a query for a host(A) record? or is it saying that a query came in from 128.1.60.221 for a host(A) record named POS188? Just looking for reference to help explain this. The good news is the only
IP address that shows(128.1.60.221) is the IP of the DNS server, but the only thing I could find for reference was this -
http://technet.microsoft.com/en-us/library/cc776361(WS.10).aspx
9/16/2014 12:05:23 AM 1144 PACKET 000000000624CBD0 UDP Rcv 128.1.60.221    8952   Q [0001   D   NOERROR] A
(8)POS188(11)contoso(3)com(0)
Thanks,
Dan Heim

Hi Dan,
The example you provide means that the DNS server receive a packet sent by 128.1.60.221,and the packet is used to query a host(A) record named POS188.contoso.com.
And the detail information about each field of the message is shows below. It is also showed in the dns.log.
Message logging key (for packets - other items use a subset of these fields):
                Field # Information         Values
                   1     Date
                   2     Time
                   3     Thread ID
                   4     Context
                   5     Internal packet identifier
                   6     UDP/TCP indicator
                   7     Send/Receive indicator
8     Remote IP
                   9     Xid (hex)
                10     Query/Response      R = Response
                             blank = Query
                11     Opcode
Q = Standard Query
N = Notify
U = Update
? = Unknown
                12     [ Flags (hex)
                13     Flags (char codes) A = Authoritative Answer
T = Truncated Response
                             D = Recursion Desired
R = Recursion Available
                14     ResponseCode ]
15     Question Type
16     Question Name
The corresponding example:
9/16/2014 12:05:23 AM 1144 PACKET 000000000624CBD0 UDP
Rcv 128.1.60.221    8952   Q [0001
D   NOERROR] A
(8)POS188(11)contoso(3)com(0)
Best Regards,
Tina

Configuring airport DNS servers

I use an airport extreme base station which connects to the internet via an ethernet DSL connection. The airport TCP/IP settings are DHCP. The DNS servers, however, show 192.168.1.1 and not the DNS settings of the DSL. As a result the internet connection on my MacBook Pro is patchy at best with some pages that open and images not showing up. The only way I resolve this is by manually setting the DNS servers in my settings on the laptop. I have tried manually setting the DNS configuration on my Airport but for some reason this does not broadcast to all the computers in my house. The DNS settings that do appear on computers are the standard 192.168.1.1 and not the actual DNS. I cannot seem to figure out why the airport is doing this. Any suggestions would be appreciated.

I am also wondering if it is possible to turn DNS relay off on an Airport Extreme or Airport Express. I am using the latest firmware on both devices, 7.6.1 and they are the latest model.
Regarding your question about DNS servers; the IP address that shows in your device as a DNS server is the Airport Extreme LAN IP address. DNS queries will be sent to that device, and the DNS settings which it uses will be used to look domain names up.
So, for now, put the DNS server addresses you'd like to use on your Airport Extreme. This is done through the Airport Utility, under Internet > Internet Options.
Also, as a final note, try the ' namebench ' program to find the best DNS servers available. It helped me choose ipv4 dns servers and I'm noticing a difference in loading times.

Changing settings for DNS Servers?

I need to enter some DNS settings in order to use certain programs on the network. On a Windowz machine, these settings are entered into an area called DNS suffixes.
I go to Network and try to enter the names into DNS Servers, though it is only allowing me to enter certain characters. For example, it will not let me enter a "l" or a "p." Why is this?
Thanks.

The only thing you can enter for DNS servers is the actual IP address in the form: xxx.xxx.xxx.xxx, e.g., 192.0.100.40

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 :-)

Switching from Comcast DNS servers solve my slow image loading on WiFi devices?

I have a Netgear C3700 N600 WiFi Cable Modem. I have two android devices that were being very laggy when I was connecting to my devices 5g connection when loading pictures. There was no packet loss and signal strength was high. The download tests show very high speeds. But anytime I went to Play Store, Facebook, or tried to surf the internet, pages or images would load in very slowly.
This was happening on both my Android Devices running Android 5.1 and 5.0.1 (Nexus 6 and Galaxy S4). My C3700 allows me to changes the DNS server from the one provided from the cable company (Comcast Xfinity). After setting my modem's DNS to Google DNS servers ( 8.8.8.8 and 8.8.4.4 ) my issues were resolved! Now I'm just trying to figure out why this is the case. Related: http://forums.xfinity.com/t5/Home-Networking-Router-WiFi/Xfinity-Wireless-very-slow-on-mobile-devices-only/td-p/2197456

You may also want to download Namebench. It is a DNS server benchmarking program that will find the closest and fastest DNS server near you. Google's DNS are good but there are probably better and closer ones out there to you.

"No DNS Servers" error after 7.6 update

After updating my Airport Extreme 4thGen to firmware 7.6 I recevied this "No DNS Servers error". I did a restart of the modem then the Airport Extreme the problem is still there. Please help.

Crowhaven, did that work?
I just updated firmware for my 5th gen Extreme, and got told that there were no DNS servers.
I don't have a clue what a DNS server is.... (and why should I, I'm no IT expert!).
I went into network settings, clicked on my 2Wire option (modem that used to do the wifi too) and found an IP address and some words.... it wouldn't let me type letters into the DNS box that came up with the warning, so I just typed some numbers in, which appear to be an IP address too.... it seemed to work.... I'm managing to post this.
However, I have a feeling that I'll have problems later... :-)
I'm running the latest version of Snow Leopard on a Mac Pro, 1st gen Intel.
Anyone know what I should put in those two DNS boxes???

Testing an ISA Server Rule, the recursive query to other DNS Servers test fails

Hello,
I am trying to configure the following infrastructure with ISA Server 2006 and two W2003 servers (called "Server1" and "Server2") . "Server1" is a domain controller, and in
"Server2" is the ISA Server installed, which also has
attached two network Ethernet cards, one called "Internal Ethernet Card", and the other one called
"External Ethernet Card".
The infrastructure would be: "Internal Ethernet Card"---- ISA Server ----"External Ethernet Card"---"Router"----"Internet"
"Internal Ethernet Card" manages the internal package traffic of the infrastructure, the network segment which belongs is isolated from what we could called the Outbound traffic, which is linked to a router. "Internal Ethernet Card" it`s
a virtual network.
"Internal Ethernet Card" feature configuration is the following:
- IP address: 192.168.3.3
- Subnet Mask: 255.255.255.0
- DHCP Enabled: No
- DNS Server: 192.168.3.1 (Must point to the DC "Server1" which has the DNS Service installed)
- Default Gateway: None (because doesnt point to outside)
- Primary WINS Server: 192.168.3.1
The "External Ethernet Card" provides, the outbound connection, and this card is connected to the physical router.
It`s feature configuration is the following:
- IP address: 192.168.1.50
- Subnet Mask: 255.255.255.0
- DHCP Enabled: No
- Default Gateway: 192.168.1.1
- DNS Servers: 192.168.3.1 (Must point to the DC "Server1" which has the DNS Service installed)
After configuring the network cards, I create the following rule in the ISA Server to allow the traffic towards outside from the server and the clients which have joined to the domain:
Action: Allow. Protocol: DNS. From:"Server2". To : External. Condition: All Users
After applying the changes to update the configuration, I enter in the Dns Server of "Server1" and in the "Monitoring" tab, I run a "recursive query to other DNS Servers" but fails.
Only works the "simple query against this DNS Server".
I don`t know why fails, but I`m stucked on this issue, because in the "Server1" DNS Server, in the "domain forward IP address list", I have added two DNS addresses which work OK.
I would appreciate some help to solve this issue.
Thanks
Regards

Hello Ms. Long,
Yes, you are right. In the Server1 is configured the DNS server, to use forwarders whose are set in the field "Selected domain`s forwarder IP address list", two DNS address numbers obtained from "Open DNS", which work well.
There is no DNS Server linked to the External NIC.
The Server1 belongs to a private network configured as "VMnet3", which it is set as follows:
IP address: 192.168.3.1
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.3.3
DNS Server: 192.168.3.1
I have tried to test your suggested idea:
> set d2
> google.com
Server: srv-dcfs-01.dominio.local
Address: 192.168.3.1
SendRequest(), len 42
HEADER:
opcode = QUERY, id = 2, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
google.com.dominio.local, type = A, class = IN
Got answer (113 bytes):
HEADER:
opcode = QUERY, id = 2, rcode = NXDOMAIN
header flags: response, auth. answer, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
google.com.dominio.local, type = A, class = IN
AUTHORITY RECORDS:
-> dominio.local
type = SOA, class = IN, dlen = 46
ttl = 3600 (1 hour)
primary name server = srv-dcfs-01.dominio.local
responsible mail addr = hostmaster
serial = 41
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 86400 (1 day)
default TTL = 3600 (1 hour)
SendRequest(), len 28
HEADER:
opcode = QUERY, id = 3, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
google.com, type = A, class = IN
DNS request timed out.
timeout was 2 seconds.
timeout (2 secs)
SendRequest failed
*** Request to srv-dcfs-01.dominio.local timed-out
As you can see highlighted in bold, the problem remains in the "recursive query to other DNS Servers" check.
Maybe is better to put the issue on the "Windows Server General Forum" , because the issue has not nothing in common with the ISA Server, dont you?
Thanks
Best regards

Why can I not log into The app store after changing credit card information?

Why can I not log into the App store after changing credit card information?

DNS -
Some folks resolve download and other connection issues by using either OpenDNS or Google Public DNS services. The best use is to use it as the DNS configuration in your modem/router/gateway device, but often the configuration in the computer or iOS device will over ride the other configuration if you don't have access.
Open DNS;
http://www.opendns.com
208.67.222.222, 208.67.220.220
Google Public DNS;
https://developers.google.com/speed/public-dns/
8.8.8.8, 8.8.4.4

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.)

Fetching the DNS servers

Hi
In java version 1.4
How can i get the list of the DNS servers configured on my operating system?
And how can I change the current (primary) dns server the InetAddress class is resolving the hosts with to another one?
Thanks

[root@solaris ~]# cat /etc/named.conf
options {
directory "/var/named"; # Working directory
pid-file "named.pid"; # Pid file in working dir
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
* If there is a firewall between you and nameservers
* you want to talk to, you might need to uncomment the
* query-source directive below. Previous versions of
* BIND always askedquestions using port 53, but BIND
* 8.1 uses an unprivileged port by default.
# query-source address * port 53;
//zone "." {
// type hint;
// file "named.ca";
zone "0.0.127.in-addr.arpa" {
type master;
file "named.local";
notify no;
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
[root@solaris ~]# mkdir /var/named
[root@solaris ~]# mkdir /var/named/data
[root@solaris ~]# svcadm enable /network/dns/server:default
Now you have you own DNS server

Why do DNS servers log in to my Router ?

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