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• DNS and DHCP not agreeing on an IP address

  - by Mr. Jefferson

  I'm having a problem where our Windows Server 2003 domain controller assigns my Windows 7 computer one IP address (x.x.x.75) via DHCP, but reports another (x.x.x.84) via DNS. This causes some interesting behavior on the network. If I change my adapter settings to get IP and DNS addresses from DHCP, I can access the internet, but no one on our network can access my computer. If I change my IP manually to what DNS says it is, I lose my internet access, but everyone can get to my computer again. I know that we have some old, invalid reverse DNS pointers hanging around (a reverse lookup on an IP address often gives more than one result, usually not including the one that is correct), so that could be contributing, but my problem is recent, and the invalid reverse pointers have been around a long time. What's going on, and how do I fix it?

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• xp vpn client dns issue

  - by David Archer

  Hi All, I have a problem with dns when connected to my work vpn. For ease of explanation I'll use the following in my outline of the problem: - name of my machine on work network is REMOTE_XP (original i know) - ip of my machine on work network is 192.168.2.80 - name of my machine on my local network is LOCAL_XP - ip of my machine on my local network is 10.0.0.3 What I want to be able to do when connected to vpn: - browse the internet from LOCAL_XP - ping by name REMOTE_XP Now it seems I've so far mentioned either 1 but not both of my wishlist. If i go to my vpn network properties (on LOCAL_XP) and uncheck the "use default dns on remote network" then I can browse the internet from my local machine but can't ping REMOTE_XP (though I can ping 192.168.2.80) If I check "use default dns..." then I can ping REMOTE_XP but can't browse the internet from LOCAL_XP. Is there a way I can have my dns cake and eat it, or will I have to accept that it will be an either/or situation? Thanks in advance.

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• Add DNS record for subdomain on different web hotel

  - by Martin Wiboe

  Hi, I am quite inexperienced with DNS, so this might be simple. Our main domain foo.com is hosted at provider A. Now, we would like to host bar.foo.com at some other provider B - they have the domain set up with them, so I figure that I can do this by somehow adding the nameserver at provider B to the DNS configuration at provider A. The current DNS config is as follows: http://imgur.com/kG099.png How can I add the new subdomain to this configuration? Regards, Martin Wiboe

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• Windows 2003 Active Directory Integrated DNS zone not registering non-domain computers

  - by Jeff Willener

  I'm not a networking guy by all means, I'm just a developer who dabbles enough to get into trouble and I'm there. So bear with me... :) At my office I have a Windows 2003 Domain Controller which also services DNS. On the domain I have a handful of computers and other misc. equipment/toys. For the DNS I only created a Forward Lookup Zone for my domain (mydomain.com). I run a lot of VM's so generally I have everything on the domain, however some of those VM's are not and only in a 'Workgroup'. I also have another laptop which belongs to another domain (otherdomain.com) which is here 100% but I use it for other purposes and has to belong to the otherdomain.com. With all that said, I have two questions: I have found any computer not on mydomain.com does not register it's IP address even though 'Register this connections address in DNS' is set to in the 'Advanced TCP/IP Settings' for the nic. Where have I messed this up? On the laptop which is registered on otherdomain.com, when I do a nslookup for a computer on mydomain.com (e.g. nslookup devbox1) it appends otherdomain.com as the suffix (e.g. queries devbox1.otherdomain.com). Same thing occurs if I use the fully qualified name. In the 'Advanced TCP/IP Settings' for that nic, I can 'Append these DNS suffixes' of mydomain.com but I fear that will hose my DNS lookups when I VPN to otherdomain.com. So what is the correct approach to resolve this issue? Do I add both mydomain.com and otherdomain.com in that order?

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• DNS Settings in Cisco Wireless Lan Controllers

  - by Braden

  The WLC is a 2100 series and I have looked back and forth through the entire web interface. Originally the idea was that the gateway should be the DNS controler and the WLC pointed directly at the gateway. For some reason, random clients are having DNS specific issues when it comes to seeing certain shares around the network. The problems are also very intermittent. Aside from going to each box and implementing a static DNS is there ACTUALLY a DNS setting lodged into the WLC settings (and I am being a numpty and can't find them) or am I stuck with performing the config 1 by 1?

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• Godaddy hosting with dynamic ip?

  - by Razor Storm

  I bought a domain name on godaddy.com let's call it www.website.com, but my server has a dynamic ip, how do I resolve this issue? What I've tried: get a dns account at dyndns.com let's call it dns.dyndns.com, so I set up godaddy to forward the domain to dns.dyndns.com. problem: When the user goes to www.website.com, they see dns.dyndns.com in the url bar. Bad So then I set up the forwarding on godaddy to forward with domain masking, but then the problem is now that users can't even see url paths/get queries/ or hash marks anymore! `www.website.com/folder/search?id=4#ajax=4` becomes just www.website.com in the url bar. bad! What do I do?

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• linux dns server

  - by Clear.Cache

  Can someone explain to me how to easily setup a centos 5 (64bit) dns server? I want to use this strictly for dns for my clients who require rdns (ptr) for their domains. I do have IP delegation/authority from the data center and allocated IPs directly from ARIN. I just want to setup a Centos 5 box to use strictly as a dns server, perhaps with redundancy with a secondary, clustered (or not) dns server Server 1 = dns1.mycompany.com Server 2 = dns2.mycompany.com Then, I need simply instructions on how to create rdns records for clients upon request, especially in bulk amounts. Thank you.

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• Surgemail DNS lookup failure

  - by Spencer Ruport

  Just curious if anyone has any experience with Surgemail. I've set it up a couple times and never had an issue but my latest install keeps leaving outgoing messages in the queue with the error "DNS Lookup Failed". I double checked that the local DNS server is running and even tried switching the IPs to my ISP's DNS servers but still no go. [DNS] Ok(avge) Bad(avge) 76.227.63.137: 0(0.0s) 5(31.0s) 76.227.63.254: 0(0.0s) 1(0.0s) Anyone have any ideas why this might be happening?? Thanks.

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• Windows 2003 DNS updates from ISC DHCP server

  - by wolfgangsz

  We have a very mixed network, with most clients being Debian Lenny, the rest Windows XP/Vista/7. The network itself is split into two segments (for technical reasons) called "corporate" and "engineering". On the "corporate" side all clients get their IP addresses from a Windows DHCP server and the dynamic updates into the Windows DNS work just fine. On the "engineering" side, clients get their IP addresses from a linux machine running the standard ISC DHCP server. Although this server is configured to do dynamic DNS updates, they actually don't work. Anybody got any advice on how to fix this? Please note: dynamic updates from the clients directly into the DNS would work, but are not an option for us. So this is strictly on how make this work from an ISC DHCP server to a Windows DNS server.

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• Clients didn't switch to secondary DNS server during fail over

  - by The Digital Ninja

  I have two internal dns servers set up and all my servers have both of them in the resolv.conf Our main dns server went down and suddenly no server could see each other. I edited a few of the servers resolv.conf manually and committed out the first (down) dns server and that machine would instantly be able to ping again. What did I do wrong, does it not auto switch to the secondary dns server when it times out? # File managed by puppet nameserver 192.168.146.100 nameserver 192.168.159.101 ;nameserver 72.14.188.5 domain example.com search example.com

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• Round-Robin DNS in mobile networks

  - by k7k0

  After reading load distribution alternatives and giving my limited skills on the area I'm biased toward round-robin DNS strategy. From what I understood, one key aspect of DNS Round-Robin is setting a low TTL value, avoiding caching. My main concern is that all my traffic comes from mobile networks, almost 30% of that comes from t-mobile 3G. Some questions: 1) Is there a chance that almost all clients on the same mobile network will be redirected to the same IP in the TTL frame? That would kill the distribution technique. 2) If I choose a really low TTL (zero or one). That impacts directly over client performance? It does a DNS miss every time or it's a setting that only impacts on DNS servers? Any help would be much appreciated. Thanks

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• Help setting up a secondary authoritative DNS server.

  - by GLB03

  We have three Authoritative DNS servers and three recursive/caching DNS servers on my campus. Authoritative servers DNS1- Windows 2003 DNS2- Old Red Hat ----- Replacing w/ newer version DNS3- Windows 2008 (I installed) Caching and Recursive resolvers servers Server1- Windows 2003 Server2- CentOS 5.2 (I installed) Server3- CentOS 5.3 (I installed) I am replacing DNS2 with a newer Red Hat version, but have no documentation on how it was implemented. I have setup caching and windows authoritative servers, but not a linux secondary authoritative server. I have a perl script from the original server that pulls data from our DNS1 server. We use DJBDNS and TinyDNS on our linux servers. Our Network Engineer says the DNS2 server I am replacing is an authoritative server that doesn't need to be caching, but the only instructions I see is for an Authoritative server that does caching as well. Can someone point me in the right directions. I thought I was on the right track with using these instructions but when I query my new dns server I get "No response from server", I have temporarily disabled iptables to eliminate it from being an issue. ps -aux | grep dns avahi 3493 0.0 0.2 2600 1272 ? Ss Apr24 0:05 avahi-daemon: running [newdns2.local] root 5254 0.0 0.1 3920 680 pts/0 R+ 09:56 0:00 grep dns root 6451 0.0 0.0 1528 308 ? S Apr29 0:00 supervise tinydns dnslog 6454 0.0 0.0 1540 308 ? S Apr29 0:00 multilog t ./main tinydns 9269 0.0 0.0 1652 308 ? S Apr29 0:00 /usr/local/bin/tinydns

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• IPSec tunnel between FortiGate and iPhone / iOS - Works except for DNS / Wins

  - by user57988

  I have configured my Fortigate with a new VPN IPSec tunnel to allow the iOS Cisco client to connect. That works fine. I can RDP to my servers, browse to my servers via IP address, etc. But, the iPhone does not resolve my internal IP addresses. I have added the DNS servers that serve addresses for my internal users, as well as the WINS servers, but the iPhone acts like it doesn't see them at all. config vpn ipsec phase1-interface edit "iPhone_VPN" set type dynamic set interface "wan1" set dhgrp 2 set proposal 3des-sha1 3des-md5 set xauthtype auto set mode-cfg enable set authusrgrp "iPhone_VPN_Users" set ipv4-start-ip 10.10.99.100 set ipv4-end-ip 10.10.99.199 set ipv4-netmask 255.255.0.0 set ipv4-dns-server1 10.10.2.1 set ipv4-dns-server2 10.22.1.80 set ipv4-wins-server1 10.10.2.1 set ipv4-wins-server2 10.22.1.80 set ipv4-split-include "Dialup_VPN_Networks" set psksecret ENC xxxxx next end For whatever reason, as far as I can tell, the iPhone does not 'see' the DNS or WINS entries. I don't know how to check it...

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• setup dns server on leopard machine?

  - by user9179

  what is the easiest way to setup dns server on leopard machine? Is leopard come with dns server? my leopard machine virtual name is abc.local . i want to add this to dns server. can guide?

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• Windows server 2008, Dns. I'm confused

  - by Dejan.S

  Hi. I recently setup a window server 2008 server at work. Keep in mind I have never worked with it before:). Background story is I try to host a couple of sites on the server through iis7, I got domains (currently hosted at other hosters for the moment). I want to point the domain NS to my server on all of them. I have read how to setup a DNS on the server, so far so good. now my dns is companyname.com in the server manager I got DNS / companyname.com in there I got ns.comanyname.com, in there I got Host(A) with the server ip now this is where I get confused about how things work with DNS, NS & Host(A). I dont know how to assign(so to speak) the Host(A) to one of my webapps hosted on the iis7, because that is the pointer right?. To leave an example to work with lets say, Hosted.com is hosted on my iis7, on port 81. You don't understand how great full I would be if somebody could explain this confusion. EDIT: Do I need to create a DNS for every site hosted on my server? Or just make a A Host/Record? Thanks guys

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• BIND9 DNS Server

  - by Stevecomptech

  I am trying to set up my own DNS server solaris 10, i used the setup guide from http://www.logiqwest.com/dataCenter/Demos/RunBooks/DNS/DNSsetup.html I tried to join windows xp clients to the domain i configured using the above guide but i was unable to join giving me these errors, An error occurred when DNS was queried for the service location (SRV) resource record used to locate adomain controller for domain MYDOMAIN.COM. The error was: "No records found for given DNS query." (error code 0x0000251D DNS_INFO_NO_RECORDS) The query was for the SRV record for _ldap._tcp.dc._msdcs.MYDOMAIN.COM Where could i be going wrong? Your assistance will highly be appreciated

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• DNS Provider/Domain Registrar

  - by Arcath

  I have a whole bunch of domains with my current web host and when i got the package i got it with a few gig of web space and a bunch of mysql databases but times have changed and now and i don't use the hosting im paying for, and i just my host as a DNS server to forward everything else where. The process of removing the host is going to require me to transfer all the domains to another package etc... which is going to cause disruption so my question is: Who is the best provider for DNS only? I don't want any space or mail just someone to hold the domains and let me set any DNS options I want (A/MX/CNAME records for everything, even possibly the ability to point my domains at my own DNS server).

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• Can a faulty DNS record prevent networking?

  - by Bob

  My server's network interfaces are not available anymore since yesterday evening. I didn't change anything, but I added a new DNS-record shortly before. Unfortunately, the web interface I used to add this DNS record escaped some characters, so I've got a faulty DNS record: example.com 86400 IN TXT "\"v=spf1 mx a -all\"" However, this is the only unusual thing I could notice about this. Is it possible that the \-characters in my DNS record are confusing for some routers? Or could it be the system itself which is confused by this (it's a Debian Lenny system). Unfortunately, I can't quick-test it because of the long TTL of the record.

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• How to query a DHCP server to get the local DNS serves

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a)reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b)calling their T/S (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• How to query a DHCP server to get the local DNS serves

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a)reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b)calling their T/S (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• How does Windows 7 DNS client work?

  - by Mark Allison

  I am using a local DHCP and DNS server on my home network on a linux machine. It is running CentOS 6.3 with dnsmasq 2.48. It's all working fine except for local DNS lookups for Windows machines only. I have a mix of Ubuntu, CentOS and Windows machines on the network, some virtual, some physical. I have a machine called boron and the domain is called localdomain If I ping boron from any linux machine, I get [root@lithium lists]# ping -c3 boron PING boron.localdomain (10.0.0.5) 56(84) bytes of data. 64 bytes from boron.localdomain (10.0.0.5): icmp_seq=1 ttl=64 time=0.740 ms 64 bytes from boron.localdomain (10.0.0.5): icmp_seq=2 ttl=64 time=0.478 ms 64 bytes from boron.localdomain (10.0.0.5): icmp_seq=3 ttl=64 time=0.458 ms --- boron.localdomain ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2000ms rtt min/avg/max/mdev = 0.458/0.558/0.740/0.131 ms If I do it from my Windows 7 machine, I get: Ping request could not find host boron. Please check the name and try again. If I try ping boron.localdomain I get: Pinging boron.localdomain [67.215.65.132] with 32 bytes of data: Reply from 67.215.65.132: bytes=32 time=16ms TTL=57 Reply from 67.215.65.132: bytes=32 time=188ms TTL=57 Reply from 67.215.65.132: bytes=32 time=15ms TTL=57 Reply from 67.215.65.132: bytes=32 time=14ms TTL=57 Ping statistics for 67.215.65.132: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 14ms, Maximum = 188ms, Average = 58ms which is clearly wrong. Why is it going out to the internet? Why can't my windows machine resolve the boron hostname to a FQDN? My Windows machines and linux machines get their network config from DHCP. UPDATE If I do ipconfig /all in Windows, it looks as I would expect: Windows IP Configuration Host Name . . . . . . . . . . . . : lanthanum Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : .localdomain Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : .localdomain Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller Physical Address. . . . . . . . . : 50-E5-49-38-FC-A2 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 10.0.0.57(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : 23 August 2012 13:58:45 Lease Expires . . . . . . . . . . : 24 August 2012 07:58:48 Default Gateway . . . . . . . . . : 10.0.0.6 DHCP Server . . . . . . . . . . . : 10.0.0.6 DNS Servers . . . . . . . . . . . : 10.0.0.6 208.67.222.222 208.67.220.220 NetBIOS over Tcpip. . . . . . . . : Enabled When I do an nslookup I get: Server: carbon.localdomain Address: 10.0.0.6 *** carbon.localdomain can't find boron: Unspecified error However if I do ifconfig -a in Linux I get: [root@nitrogen ~]# ifconfig -a eth0 Link encap:Ethernet HWaddr 00:0C:29:AF:EC:2A inet addr:10.0.0.7 Bcast:10.0.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:187687 errors:0 dropped:0 overruns:0 frame:0 TX packets:5857 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:23910700 (22.8 MiB) TX bytes:712964 (696.2 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:329894 errors:0 dropped:0 overruns:0 frame:0 TX packets:329894 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:67153143 (64.0 MiB) TX bytes:67153143 (64.0 MiB) and nslookup: [root@nitrogen ~]# nslookup boron Server: 10.0.0.6 Address: 10.0.0.6#53 Name: boron Address: 10.0.0.5 Both machines are on the same network using the same DHCP server. UPDATE 2 I thought the issue was resolved but I am getting intermittent DNS resolving issues but only on my Windows 7 machine. All my linux boxes are fine. This is what happens when I ping and nslookup from Windows to a Windows 2008 Server: C:\Users\mark>nslookup magnesium Server: carbon.localdomain Address: 10.0.0.6 Name: magnesium.localdomain Address: 10.0.0.12 C:\Users\mark>ping magnesium Pinging magnesium.localdomain [67.215.65.132] with 32 bytes of data: Reply from 67.215.65.132: bytes=32 time=267ms TTL=57 Reply from 67.215.65.132: bytes=32 time=162ms TTL=57 Reply from 67.215.65.132: bytes=32 time=510ms TTL=57 Reply from 67.215.65.132: bytes=32 time=146ms TTL=57 Ping statistics for 67.215.65.132: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 146ms, Maximum = 510ms, Average = 271ms And from Linux: [root@beryllium ~]# ping -c4 magnesium PING magnesium.localdomain (10.0.0.12) 56(84) bytes of data. 64 bytes from magnesium.localdomain (10.0.0.12): icmp_seq=1 ttl=128 time=0.176 ms 64 bytes from magnesium.localdomain (10.0.0.12): icmp_seq=2 ttl=128 time=0.634 ms 64 bytes from magnesium.localdomain (10.0.0.12): icmp_seq=3 ttl=128 time=0.685 ms 64 bytes from magnesium.localdomain (10.0.0.12): icmp_seq=4 ttl=128 time=0.263 ms --- magnesium.localdomain ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3002ms rtt min/avg/max/mdev = 0.176/0.439/0.685/0.223 ms [root@beryllium ~]# nslookup magnesium Server: 10.0.0.6 Address: 10.0.0.6#53 Name: magnesium.localdomain Address: 10.0.0.12 UPDATE 3 I stopped the Windows DNS client on my Windows 7 machine with net stop dnscache and it is now working fine. It would be nice to get DNS working with the DNS client on, but I might be OK without it, what do you think?

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• Industry Standard DNS & Authentication?

  - by James Murphy

  I'm just curious as to what is considered industry standard when it comes to doing DNS and authentication on an environment with mainly linux machines? Do people use Windows DNS & Windows AD to do it all if they have at least one windows server (well - alot might, but should they)? Does ANYONE use hosts files or local only user accounts on each server? What would people like Facebook/Google use for their DNS and authentication on their servers? We have an environment where we have about 10-15 linux servers and 1-2 windows servers. We are currently using Windows AD and Windows DNS but it doesn't seem like it's the most secure/stable/scalable way to do it for a mainly linux environment? We use RHEL as our linux environment.

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• Multihomed Windows server and DNS resolution

  - by mpkilroy

  I have a Windows 2008 server with two IP addresses assigned to a single NIC. The DNS settings are setup to register the connections's addresses on the DNS server. nslookup shows both IP addresses for the server name. How is name resolution done in this case, i.e. which IP address does the DNS server return for a host lookup? Or does it return both, and the client selects one of the addresses?

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• Configuring DNS and IIS for multiple domains on a single server

  - by RichardS

  I might be over complicating this but...I am hosting several websites and dns for the domains on a single server: domain1.net domain1.com domain2.net I have three items which I'm trying to work out whether to achieve by DNS, by IIS hostnames(bindings), or by IIS redirect. 1. Where I have domain1.net and domain1.com, I want everything from both (all emails and web requests) to just point to the domain1.net. Can I do this at the DNS level, or do I have to set up the email as forwarders on the email server and the domain as a hostname in IIS? For example: [email protected] [email protected] www.domain1.com www.domain1.net 2. I want to make sure that requests for domain1.net and www.domain1.net both resolve to the same place. Should this be done with DNS or with multiple hostnames, or with IIS redirects? 3. If I then want to have one webmail site serving all of domains (webmail.domain1.net, webmail.domain2.net), is it best to this with a cname in DNS or with host headers in IIS?

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• Access Bind9 DNS in Virtualbox on Host

  - by Philipp Melab

  I've set up a Ubuntu 10.04 Virtual Box with a Bind9 DNS server. The Box has a NAT Network connection for internet access and a host-only adapter for static ip connections from the host (OSX Lion). Thats the only way i managed to get internet and static ip inside the box, guess there is a better one ... The DNS works fine from inside the virtualbox, but not from the host. The http and ftp on the guest system is accessible via both addresses, so connection between host and guest are fine i guess. I tried to add both IP's as name servers. I'm completely new to Bind9 and DNS configuration. Anybody has a hint for me whats wrong? Or how i have to configure the DNS server?

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