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• Two mail servers, need help with dns configuration for the backup one

  - by user92231

  I need to run a redundant backup mail server in case the main one goes down. The settings in GoDaddy look something like the following: A (Host) Host Points to @ ip address of mail1 41.x.x.x mail1 ip address of mail1 41.x.x.x mail2 ip address of mail2 196.x.x.x MX Priority host points to 10 @ mail1.mydomain.com 20 @ mail2.mydomain.com When mail1 goes down, mail2 is able to get emails. I can access it through the browser with no problem, but I want my users to able to pop3/smtp as well without changing anything in their outlook. I dont want any impact to the users when mail1 is down. Also, I'm using the windows server DFS to keep both folders of the mails in sync. Is this the right way, or should I be using something else?

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• hightraffic dns ttl record

  - by hest

  Whats bestpratice TTL for hightraffic www sites? Should there be a high TTL to make dnsservers around cache longer so the dnsserver wont have to get requests to often?

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• ipv6 reverse DNS delegation

  - by user1709492

  I currently have 2001:1973:2303::/48 assigned to me and i'll be assigning /64's to customer's I'd like to have 1 zonefile for the /48 where i can essentially point / redirect query to different nameservers. Example ( Desired effect ) 2001:1973:2303:1234::/64 -> ns1.example.com, ns2.example.com 2001:1973:2303:2345::/64 -> ns99.example2.com, ns100.example2.com 2001:1973:2303:4321::/64 -> ns1.cust1.com, ns2.cust1.com Current /48 zonefile $TTL 3h $ORIGIN 3.0.3.2.3.7.9.1.1.0.0.2.ip6.arpa. @ IN SOA ns3.example.ca. ns4.example.ca. ( 2011071030 ; serial 3h ; refresh after 3 hours 1h ; retry after 1 hour 1w ; expire after 1 week 1h ) ; negative caching TTL of 1 hour IN NS ns3.example.ca. IN NS ns4.example.ca. 1234 IN NS ns1.example.com. NS ns2.example.com. 2345 IN NS ns99.example2.com. NS ns100.example2.com. 4321 IN NS ns1.cust1.com. NS ns2.cust1.com. Where am i going wrong ? My request seems simple to me atleast. To put it in terms of firewalling i want to redirect traffic client queries 2001:1973:2303:4321::1 - ns3.example.ca sees the request and redirects the query to ns1.cust1.com - ns1.cust1.com answers the query with omg.itworks.ca ( provided ns1.cust1.com is properly configured.

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• Resolving host names to their domain name in an internal BIND domain

  - by Adam Plumb

  I'm setting up a domain on my home network for learning purposes, using BIND on CentOS to act as the name server. I've got the name server up and running as type master for my internal domain (plumbnicoll.family), and can do forward and reverse lookups from other computers in my LAN. For example, host office2.plumbnicoll.family correctly returns office2.plumbnicoll.family has address 192.168.1.3. What I'd like is to be able to resolve just office2 to its address, without needing to put .plumbnicoll.family at the end. Is this possible, or even desirable to do? I'm running a mixed environment at home with both Linux and Windows computers.

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• tcpdump dns output codes

  - by tim

  Captured on the nameserver: 21:54:35.391126 IP resolver.7538 > server.domain: 57385% [1au] A? www.domain.de. (42) What das the percent sign in 57385% mean? As far as I can see 57385 is the clients sequence number, a plus would mean RD bit set. Second question: what does the ARCOUNT do in the query? As I understand the tcpdump man page the [1au] means tcpdump treats this as a protocol anomalie - as would I. I see this in a lot of queries.

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• DNS lookup aliasing of hostnames (not IP aliases), probably via dnsmasq

  - by intuited

  I'd like to be able to set up a host, say "eg", to be an alias to some server on the internet, say "example.example.com". I just need this functionality to be available from my local machine. I'm running dnsmasq on that machine, which is running ubuntu 9.10. Is there a way to configure dnsmasq or the resolver subsystem (including avahi) to resolve that alias hostname via the actual hostname, so that eg will resolve to the ip address of example.example.com?

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• How Can I Map IIS on My PC with Static IP to my Domain Name?

  - by Subhen

  Hi, Now I have got an internet connection with Static Ip. I want to know How can I map my website to my Static IP(Received from ISP). I know this is not a good Idea for Security and Performance issues, But just Wanted to know as I can set up a test Project. Again, Can't I just by a domain name and map it to my Static Ip, instead of buying them from WebHosting Providers. Now I have bought the space from bizzhost and hosted my site by setting the Name Server. Thanks, Subhen

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• What are DNS TXT records and why are they needed

  - by Saif Bechan

  I am creating a server with a primary nameserver and mutliple domains. Do i need to make TXT records for all the domain, they all have there own email, but use the mailserver from the primary.

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• Google DNS Same Entry Different Results

  - by Henrik P. Hessel

  Why is this happening? The Rootserver returns a wrong entry I fixed containing 5269.XXX.com. instead of 5269 XXX.com. Macbook @ Home ; <<>> DiG 9.6.0-APPLE-P2 <<>> @8.8.8.8 srv _xmpp-server._tcp.XXX.com. ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18412 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;_xmpp-server._tcp.XXX.com. IN SRV ;; ANSWER SECTION: _xmpp-server._tcp.XXX.com. 64328 IN SRV 10 0 5269 XXX.com. ;; Query time: 21 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Tue Dec 28 03:16:45 2010 ;; MSG SIZE rcvd: 86 Rootserver ; <<>> DiG 9.6-ESV-R1 <<>> @8.8.8.8 srv _xmpp-server._tcp.XXX.com. ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27240 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;_xmpp-server._tcp.XXX.com. IN SRV ;; ANSWER SECTION: _xmpp-server._tcp.XXX.com. 52139 IN SRV 0 10 0 5269.XXX.com. ;; Query time: 7 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Tue Dec 28 03:23:23 2010 ;; MSG SIZE rcvd: 91

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• Catch-all DNS record

  - by Christian Sciberras

  Intro Our users have the ability to buy a domain (eg: user1.com) and make it point to out website, (eg: example.com), by simply pointing user1.com to ns1/ns2.example.com . Issue So far everything's good, however, example.com does not like this; we need to set up WHM/cpanel to make the server accept user1.com . Problem is, we'd rather made this automatic, possibly without having to use WHM API. The question We need some sort of "catch-all" wildcard entry so that we capture all of our user's possible domains.

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• dig gets the right result from DNS server, but name still fails to resolve

  - by EMiller

  Under what conditions would the following occur? From a given OSX machine on an internal network: $~ cat /etc/resolv.conf nameserver 10.102.120.7 nameserver 10.102.120.2 From the same machine: $~ dig @10.102.120.7 in.local <snip> ... ;; QUESTION SECTION: ;in.local. IN A ;; ANSWER SECTION: in.local. 43200 IN A 10.102.123.30 <snip> ... And yet, this workstation cannot ping in.local, nor load pages hosted by apache on that machine. 10.102.123.30 is definitley up (2 OSX machines I know fail to resolve in.local - but other machines on the network can). I have also checked their /etc/hosts to see if anything there might interfere... Not sure what else to check...

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• cisco asa query dns external

  - by Alpacino

  my lab network asa firewall below 10.10.10.20 -- ASA --- 192.168.1.10 -- website external my client 10.10.10.20 want to access website external and i create nat nat (inside,outside) static 192.168.1.10 and access list access-list outside-acl extended permit tcp any host 10.10.10.20 eq www access-list outside-acl extended permit tcp any host 10.10.10.20 eq domain access-list inside-acl extended permit tcp 10.10.10.0 255.255.255.0 any eq www access-list inside-acl extended permit tcp 10.10.10.0 255.255.255.0 any eq domain access-group outside-acl in interface outside access-group inside-acl in interface inside when i access to website with domain name it can't access but i access website with ip address it work please help me to solve problem thank you

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• DNS Name lookup (was SSH) Not Working After Snow Leopard Upgrade

  - by Peter Cardona

  I think this started with the Snow Leopard update. Cleaned out the .ssh directory, still having the issue. ~: uname -a Darwin california-example-com.local 10.0.0 Darwin Kernel Version 10.0.0: Fri Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386 i386 ~: ssh -V OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009 ~: ls -l ~/.ssh ~: nslookup nevada Server: 10.94.62.3 Address: 10.94.62.3#53 Name: nevada.example.com Address: 10.94.62.3 ~: ssh nevada ssh: Could not resolve hostname nevada: nodename nor servname provided, or not known

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• Is there any DNS that supports Geo-location / Directional DNS?

  - by Devrim

  At ultradns.com or on comwired.com you can select multiple A records depending on location; x.com (United States) 174.1.1.1 x.com (Europe) 65.2.2.2 So requests are routed based on proximity/where they come from. You can do that as many times as you like, which is a great service for our distributed application needs. However, we want to manage this on our own servers. Do you know any linux package that does this ?

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• cPanel Domain Aliases Messing Up DNS?

  - by user37888

  Hi guys I have an issue, on my main domain when I added subdomain aliases it broke access via www and none of the sub domain aliases work. When I do it for other domains however it works. The main nameservers for this domain are ns1.domain.com and ns2.domain.com. Could it be because they are the domain servers this cannot work correctly? This worked fine in plesk, its just weird its breaking in cPanel.

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• Setting up DNS using BIND

  - by dupdupdup

  i have troubles setting up my db files. Please kindly point me in the right direction! i need to define a nameserver that manage a domain example.org.au then i need it to have two records. one called server which is the ip address of current machine the other called www where www.example.org.au will be pointed to another ip address. i cant seem to get my system to work. This is my db.example.org.au file example.org.au. IN SOA server.example.org.au. ( 1; 3; 1h; 1w; 1h ) ; ; ;Host addresses localhost.example.org.au IN A 127.0.0.1 www.example.org.au. IN A 192.168.1.200 ; another virtual machine server.example.org.au IN A 192.168.1.199 ; current virtual machine If possible Please correct my errors! thanks! Any good guides out there? Thanks in advance ! :)

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• Configuring bind9 views so I can have DNS services?

  - by Cesar Downs

  I want to configure bind9 using the Ubuntu terminal to have the DNS resolve a local name, not a domain name. For example, if I type in Nicole it will resolve my IP address in a local network fashion. How can I do this, step-by-step please? I've already installed bind9 using: sudo apt-get install bind9 It's fully installed now, I just need some help configuring. Should I be using local views? I am going to do the connection with two laptops probably connected to each other by Ethernet cable or WIFI. One of them is running Ubuntu and the other is running Windows. I not sure if that's part of the problem.

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• Can I completely remove the Windows DNS in favour of BIND9 in an AD network?

  - by Vinícius Ferrão

  I would like to remove the DNS feature of Windows Domain Controllers and point the DNS servers to our BIND9 servers. I know it's possible to setup coexistence but this requires a number of extra Windows DNS Servers equals to the number of Domain Controllers in the network. Active Directory expects the _msdcs zone and other things like _tcp, _udp; etc. The main question is: how to make BIND9 takes care of all this AD specific data? And with dynamic updating to make AD even more happier. Thanks, PS: Making BIND9 points to the Windows DNS Servers to resolve the Active Directory specific zones isn't an option. We already do this... EDIT: As today, I'm running without Windows DNS. I'm writing up a guide on how to do this, and I'll update this topic.

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• Can I log into a Domain account without pointing DNS to the domain controller?

  - by user72593

  My situation is as follows: I have a Windows 2003 Domain Controller which is also my DNS server. I have 10 Windows XP Pro PC's which all login to domain accounts. I am about the forward my DNS requests to OPENDNS so I can regulate web access but I have (2) PC's that I would like to keep unregulated. I manually changed their DNS server IP to (8.8.8.8) which worked but that caused my login to fail (by creating a 3 minute delay before it would let me get to the desktop) when I change the DNS IP back to the IP of the Domain Controller, everything works smoothly. Question is, how can I continue to login to the domain but have a different DNS path...is this possible ?

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• Which GPO is making my Domain Controller my clients' DNS server?

  - by Harry Muscle

  I maintain a small domain (about 20 clients) and we need to make some changes to the DNS server that's being used by the clients. All the clients have been hard coded to use the domain controller as their DNS. Since these are new machines, and I never changed their DNS settings, I'm guessing there must be a GPO that's causing them to use the domain controller as their DNS. Since we don't have any GPO other than the default one yet, it's got to be the default GPO, however, I have looked through all the GPO settings and none of them refer to anything related to DNS. So I'm wondering if there's anything else that might be causing this. Any help or advice is highly appreciated. Thanks, Harry

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• Server 2012 R2 DNS Conditional forwarding not working reliably, possible caching issue?

  - by Matt

  I have a bit of a home lab setup with a domain controller that is acting as the DNS server for my network. For everything, it's working fine and forwards external DNS requests to my ISP. The household recently wanted to get Netflix going and it seemed a DNS option was better than a VPN to get around the region locking, so I signed up for unblock-us.com Since I have a Windows DNS server I thought I'd be clever and make use of conditional forwarders and added the Netflix domain to the list. Initially this worked well and all devices on the network could now access Netflix, however after about an hour going to the Netflix site would result in a page cannot be found. Doing an nslookup of Netflix.com from my PC resulted in it not returning any IP addresses. As a test, I deleted the Netflix domain from the DNS servers cache and things started working again - devices could get to the site again however the same thing happens again after around half an hour to an hour. Have I missed something here that's causing it to stop working?

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• DNS Server (2008 r2) MMC The server DC01 could not be contacted. The error was: Access was denied

  - by Silviu-Ionut Radu

  I've just migrated the AD with the whole nine yards, FSMO, PDC, RID, Schema, etc, from an SBS 2003 to a Win 2008 R2 Std. I have managed to have no error in the dcdiag before I demoted the SBS 2003 from the AD, fsmocheck, conectivity, advertising, dns, etc. The SBS 2003 demoted successfully. After this step I have restarted both, the old SBS and the new Win 2008 r2. After restart the new DC (which is the GC) started with an Access denied to the DNS Server MMC, actually it is looking like I would try to connect to the 2008 r2 DNS server from an older server console I can NOT manage DNS server through MMC nor through dnscmd (Command failed: ERROR_ACCESS_DENIED 5 0x5) I cannot even use the Action Option from the DNS Server MMC because all the options are DISABLED but for "Launch nslookup". I've made a lot of research on the internet but no luck, yet. So I come to ask for help. Thank you very much.

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• Why my dns server ip got blacklisted instead of my email server ip?

  - by Khurram Masood

  We are hosting our own dns server our scenario is as under; dns ip: a.b.c.1 fqdn:ns1.example.com ------ reverse lookup to a.b.c.1 mail server ip a.b.c.2 mail.example.com ------ reverse lookup to a.b.c.2 smtp.example.com ------ no reverse lookup pop.example.com ------ no reverse lookup web server ip a.b.c.3 example.com ------ reverse lookup to a.b.c.3 www.example.com ------ no reverse lookup a few days back our dns server ip got blacklisted and all our services were down from outside. We had also added a new dns server on a separate network that caused our domain and machines with same names as above to resolve on different ips, can this b a cause of being blacklisted? But all blacklists points towards spamming. Can anyone please explain why my dns ip got blacklisted instead of my email or web server ip?

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• Can I create a DC without a DNS Server?

  - by onik

  So as the title says, I need to promote a standalone Win2008R2 server to a Domain Controller, and I don't a DNS Server (I think), as there will be no clients connected to the domain, it will be only used for Remote Desktop Services. Yes, I know, it's considered bad practice to install other roles on the DC, but in this case, it's necessary. Do I need to install the DNS Server, and if I do, how to make it as transparent as possible? EDIT: Seems that I need to install the DNS Server, so I can I configure it not to mess up my entire domain? For example: The server I need to promote is rdc.mydomain.com, and it has an A entry to it's IP in the current DNS, while other servers under mydomain.com are running Linux and don't need to know anything about this Windows box. The domain uses a third-party DNS and all edits and updates need to be done via a separate web page, our servers don't have write/update access.

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• Why are my DNS Lookups so long (300+ms) when accessing my web site?

  - by Travis

  I'm running a Fedora 11 server with Apache 2. I'm trying to optimize so things are as fast as possible from the server side, and I'm noticing (via Firebug for Firefox) that upon loading the homepage of one of the sites on the web server that for every file it loads (HTML, CSS, JavaScript, GIF, PNG, JPG, etc.), it does a DNS lookup. All of the files it is looking up are local to the server, so I'm surprised to see it even do a DNS lookup. Also, each of these lookups is in the 150-450ms range, which is way too high for my liking. I've tried adjusting /etc/resolve.conf to use Google's Public DNS servers. I restarted the network service and tapped the page again, but the numbers didn't go down. I've reverted back to the default DNS servers since I didn't see any gain. Any ideas on what is causing it to: a) do the dns lookup in the first place, and b) take so long when doing the actual lookup? Thanks in advance.

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