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• Shorten Long DNS names

  - by user32425

  Hi, Amazon gives us a very long dns names i.e. c-123-123-123-255.compute-1.amazonaws.com Is there a way to map this name into a shorter name i.e. essentially what i want to do is to modify /etc/hosts file, and map the long name into a short one, i.e. aws1 c-123-123-123-255.compute-1.amazonaws.com but because /etc/hosts file only accepts ip address mapping, then I cannot do that. Is there any other way to do this? Thanks

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• how to bypass internal DNS?

  - by fabjoa

  This is about Ubuntu but should be pretty much the same on all Linux flavors. Let's say I add an entry to my /etc/hosts such as 127.0.1.12 facebook.com and an Apache virtual host such as <VirtualHost 127.0.1.12> ServerName facebook.com DocumentRoot /var/www </VirtualHost> when i open my browser and send a GET request to facebook.com, firefox will browse my /var/www folder. Question: How could I fetch (ie, using wget in bash) the real facebook.com domain - without erasing the entry in /etc/hosts nor my Apache VirtualHost -- IOW how could I bypass internal DNS?

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• Linksys Router/Tomato Firmware DNS issues

  - by jasonh

  I've got a WRT54GS that I've loaded the current version of Tomato onto. I entered static DHCP addresses in for the devices on my network, released and renewed the address on my desktop and tried to ping another computer. All I got was The request could not find host blah. Please check the name and try again. Now, I verified that my desktop and the target machine I'm trying to ping have both received their proper static DHCP lease and that their DNS server is the IP address of my router. What am I missing?

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• Software for failover across multiple external hosts

  - by Lin

  I have multiple webservers with the same content, hosted across different providers. However, I can't seem to find a nice, simple failover solution. Load-balancing software (Pound, HAProxy, etc.) are unnecessary, and I need the flexibility to manage over 100+ domains, so the paid DNS failover solutions I've found are too expensive. So far the simplest solution I've thought of is just to set a very low TTL (30min - 1hr) in each zone entry on my nameservers (running BIND). Then, continuously monitor each server, and temporarily remove failed servers from zone entries. But this seems like something that should be currently available. I only have root access to different VPSes running CentOS. Any suggestions? Thanks!

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• DNS/Apache config to change ServerName on Mac OS X and LAN

  - by nickyc

  Hi, I want to run an apache web server on a machine running OS X, with the server running on a small intranet LAN with no internet connection. I've set up web sharing and the web server is now accessible from other machines on the LAN using the custom name a.local - but what I would like to do is remove the .local part if possible. Does anyone know how i would go about configuring this in OS X? I wasn't sure if it would be the apache httpd.conf file or some DNS config that would be required.

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• DNS entries issues

  - by Yaman

  I have some troubles with my DNS entries (or maybe my Apache conf). I have something like this : kira.mydomain.com A 123.45.67.89 youfood.mydomain.com CNAME kira.mydomain.com www.youfood.mydomain.com CNAME youfood.mydomain.com All's good when I check theses entries with nslookup. When I try going on http://www.youfood.mydomain.com, it work but not with http://youfood.mydomain.com ... Here my vhost : <VirtualHost *:80> ServerAdmin webmaster@localhost ServerName youfood.mydomain.com ServerAlias www.youfood.mydomain.com DocumentRoot /home/ftp_youfood/www/trunk <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /home/ftp_youfood/www> Options FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> [...] </VirtualHost> Is there anything wrong ?

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• DNS server not functioning correctly

  - by Shamit Shrestha

  I have setup a DNS server which isnt working properly. My domain is accswift.com which has glued to two name servers ns1.accswift.com and ns2.accswift.com for the same IP address - 203.78.164.18. On domain end everything should be fine. Please check -http://www.intodns.com/accswift.com I am sure its the problem with the linux server. Can anyone help me find where the problem is for me? Below is the settings that I have in the server. ====================== DIG [root@accswift ~]# dig accswift.com ; << DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.6 << accswift.com ;; global options: +cmd ;; Got answer: ;; -HEADER<<- opcode: QUERY, status: NOERROR, id: 11275 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;accswift.com. IN A ;; ANSWER SECTION: accswift.com. 38400 IN A 203.78.164.18 ;; AUTHORITY SECTION: accswift.com. 38400 IN NS ns1.accswift.com. accswift.com. 38400 IN NS ns2.accswift.com. ;; ADDITIONAL SECTION: ns1.accswift.com. 38400 IN A 203.78.164.18 ns2.accswift.com. 38400 IN A 203.78.164.18 ;; Query time: 1 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Wed Nov 6 20:12:16 2013 ;; MSG SIZE rcvd: 114 ============== IP Tables settings vi /etc/sysconfig/iptables *filter :FORWARD ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A FORWARD -o eth0 -j LOG --log-level 7 --log-prefix BANDWIDTH_OUT: -A FORWARD -i eth0 -j LOG --log-level 7 --log-prefix BANDWIDTH_IN: -A OUTPUT -o eth0 -j LOG --log-level 7 --log-prefix BANDWIDTH_OUT: -A INPUT -i eth0 -j LOG --log-level 7 --log-prefix BANDWIDTH_IN: -A INPUT -p udp -m udp --sport 53 -j ACCEPT -A OUTPUT -p udp -m udp --dport 53 -j ACCEPT COMMIT Completed on Fri Sep 20 04:20:33 2013 Generated by webmin *mangle :FORWARD ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT Completed Generated by webmin *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT ====DNS settings vi /var/named/accswift.com.host $ttl 38400 @ IN SOA ns1.accswift.com. root.ns1.accswift.com. ( 1382936091 10800 3600 604800 38400 ) @ IN NS ns1.accswift.com. @ IN NS ns2.accswift.com. accswift.com. IN A 203.78.164.18 accswift.com. IN NS ns1.accswift.com. www.accswift.com. IN A 203.78.164.18 ftp.accswift.com. IN A 203.78.164.18 m.accswift.com. IN A 203.78.164.18 ns1 IN A 203.78.164.18 ns2 IN A 203.78.164.18 localhost.accswift.com. IN A 127.0.0.1 webmail.accswift.com. IN A 203.78.164.18 admin.accswift.com. IN A 203.78.164.18 mail.accswift.com. IN A 203.78.164.18 accswift.com. IN MX 5 mail.accswift.com. ====Named.conf vi /etc/named.conf options { listen-on port 53 { 127.0.0.1; }; listen-on-v6 port 53 { ::1; }; directory "/var/named"; 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"; allow-query { any; }; recursion yes; allow-recursion { localhost; 192.168.2.0/24; }; dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto; /* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key"; managed-keys-directory "/var/named/dynamic"; forward first; forwarders {192.168.1.1;}; }; logging { channel default_debug { file "data/named.run"; severity dynamic; }; }; zone "." IN { type hint; file "named.ca"; }; include "/etc/named.rfc1912.zones"; include "/etc/named.root.key"; zone "accswift.com" { type master; file "/var/named/accswift.com.hosts"; allow-transfer { 127.0.0.1; localnets; 208.73.211.69; }; }; zone "ns1.accswift.com" { type master; file "/var/named/ns1.accswift.com.hosts"; }; ==================================== Can anybody find any flaw in this? I am still unable to reach accswift.com from any other ISP. But it is browsable from the same network though. Thanks in advance.

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• DNS and mod_rewrite not-collaborating

  - by ???? ?????????

  Hello, I have added a CNAME record to my DNS on my CentOS server to redirect subdomain.mydomain.com to another server. I also use mod_rewrite to rewrite mydomain.com to www.mydomain.com: RewriteEngine on RewriteCond %{HTTP_HOST} ^mydomain\.com$ [NC] RewriteRule ^(.*)$ http://www.mydomain.com/$1 [L,R=301] this is placed into .htaccess in the root public html directory Now, the problem is that whenever I lookup subdomain.mydomain.com it redirects me to www.mydomain.com I tried adding another RewriteCond: RewriteEngine on RewriteCond %{HTTP_HOST} ^mydomain\.com$ [NC] RewriteCond %{HTTP_HOST} !^subdomain\.mydomain\.com$ [NC] RewriteRule ^(.*)$ http://www.mydomain.com/$1 [L,R=301] But it didn't help... Anyone has some ideas?

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• Domain DNS Lookup time

  - by Maxim Dsouza

  I have a website hosted at www.doondoo.com. The site when loaded in the browser for the first time, takes a bit of time to load. It looks like the DNS lookup takes a lot of time. Once the site is loaded on the browser, other pages load very quickly. The application is hosted on Linode and I have pointed my domain to the nameservers of Linode i.e ns1.linode.com and ns2.linode.com I wanted to know what is the reason behind this delay in the loading. And what could be the possible means to improve it. Thanks in advance.

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• How to shorten DNS propagation effect

  - by Sempa

  Atm i have a domain example.com, it uses dedicated server, and it uses "ns1.example.com" and "ns2.example.com" as nameserver. Now i want to change to another dedicated server (with different IP obviously). How to shorten DNS propagation effect so that all visitors that open my domain will be pointed to the new server quickly? At this moment i am lowering the TTL value on old server (to 5 minutes) hoping that once i change the nameserver, all visitors will be pointed to new server. Am i correct? If not, can you give me suggestion?

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• proxy/vpn by dns entry

  - by rcourtna

  I've been using a service by unblock-us.com, which provides a proxy to Canadians/others allowing access to services that are locked down to only US ip addresses. This is easy enough to achieve by setting up a reverse proxy (eg: squid) on a US-hosted server, and then configuring your browser or OS to use that proxy. However, there is something that unblock-us does that I'm not sure how to duplicate. Rather than configuring your OS to use them as a proxy, you can simply change the DNS Server settings on your router to point to their addresses. Any requests to services they support are automatically proxied. The advantage to this is that you don't have to set up every computer in your house, and it "just works" with clients like ps3, xbox, android, etc. Disadvantage is you really don't have control over what gets proxied, as well as there are privacy concerns I suppose. How can I achieve this same functionality on my own us-based slice?

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• Can connect to DNS addresses typed in the URL but not by IP addresses

  - by Ben

  I just changed over my modem to bridged mode, and changed my wireless router to PPPoE. My PC IP address is reserved and forwards port 80 to my computer's IP address based on my MAC address. I have a problem, however. I cannot access my local webserver by public IP address or my router 192.168.0.1 wirelessly from any other computer or iPad. I can, however, connect by this PC which is connected to the wireless router via ethernet. Via wireless, it says it cannot connect, however DNS addresses work (e.g. google.com, etc.) Any ideas?

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• DNS updating issue

  - by Will

  Hey guys, I'm new to serverfault so please excuse me if I sound a tad nub. I work in an environment that is kinda peace mealed together, and I honestly don't know how it works. I'm new to the IT field and am still in school. When I replace a PC I rename the old one to mo-o-pcname and give the new one the proper name of mo-pcname (mo is a location thing we use so it really doesn't apply to the problem.) The new PC will function on the network; it will have the ability to access network resources (printers, file shares, etc) and it will have the ability to get out to the internet. However I can no longer ping the machine. It would appear as if the DNS (A) record is not getting updated or something. Like I said I'm kinda new to the field and just trying to work through this problem. Thanks for your help.

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• DNS resolution over DHCP

  - by Eric

  I have a m0n0wall router a VMWare workstation running ubuntu a windows 7 workstation running the VM The ubuntu hostname is "renraku" From the windows machine I can't resolve dns automatically for this host. For example, when I ping renraku Ping request could not find host renraku. Please check the name and try again. However nslookup seems to work nslookup renraku Server: m0n0wall.local Address: 192.168.123.254 Name: renraku Address: 192.168.123.248 I don't get how to have ping to work with hostnames. The main goal behind this is to have my web server to work with hostnames instead of ip addresses EDIT : ping 192.168.123.248 works

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• Invalid domains in DNS don't work on mac/*nix like systems

  - by David Mulder

  At work we use domains like abc-01, which work fine on windows. Whilst developing mobile applications we already saw that this doesn't work on both iOS and android which we fixed for a few specific domains (by setting the dns up that abc-01.def.local also works in those) and was assumed to be caused by it being an invalid domain. Now however it's necessary to connect through VPN from a mac and changing all relevant domains is not an option at the moment (far too many of them and would require changing the settings of far too many applications), so I was hoping whether somebody knows a trick or setting to get this to work on mac (or even linux in general).

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• Round robin DNS for dynamic website

  - by Uwe

  We want to setup multiple servers hosting the same site. Each server (iis6 or iis7) is on its own. Meaning it does not sjare any information with the others. They are not even in the same country. The problem we encounter is that if we setup a round-robin DNS (multiple IDs under one Domainname) is that the client (browser) switches the servers so that the asp.net session gets lost. The question is how do we set this up, so the clients are randomly send to one of the servers and if one fails the users go to the next one. But if a user is using one of the it should stay there. Thank you!

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• Per-machine decentralised DNS caching - nscd/lwresd/etc

  - by Dan Carley

  Preface: We have caching resolvers at each of our geographic network locations. These are clustered for resiliency and their locality reduces the latency of internal requests generated by our servers. This works well. Except that a vast quantity of the requests seen over the wire are lookups for the same records, generated by applications which don't perform any DNS caching of their own. Questions: Is there a significant benefit to running lightweight caching daemons on the individual servers in order to reduce repeated requests from hitting the network? Does anyone have experience of using [u]nscd, lwresd or dnscache to do such a thing? Are there any other packages worth looking at? Any caveats to beware of? Besides the obvious, caching and negative caching stale results.

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• dns update frequency

  - by Roderik

  I was looking after the frequency of dns updates, since I had to change the location fo the vps that hosts the domain contents. What I ussualy read is that it takes up to 72 hours to get these changes propagated, sometimes this can be sooner based on your location. I changed the nameservers for the domain vasco-da-gama.nl about a week ago. When I ping the domain name from different locations it still points the old vps (which does not exist anymore). I was wondering if its normal that it can take this long for the change to point my new vps? If I might have done something wrong here, where should I look for it (it looks all ok, when I check it). If it is reachable from your location (if so, its probably a matter of time it will propagate to my location).

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• Ecommerce Database DNS Switch

  - by KThompson

  Hello, I am moving an e-commerce site to a new server. All has been successful and its time to change the DNS for the domain. It's a relatively popular site and I fear that during propagation orders will be split between the old database and the new one. The databases do contain content that is dependent of the server it is on (Cache path, upload directory, etc.) so I can't just point the old site to the new database. Are there any solutions to this without any of the sites going down. Thanks in advance

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• Ubuntu 13.10: nslookup not automatically appending DNS suffixes

  - by Alex

  When I configure Ubuntu 13.10 server I ran into a problem: Usally (working on 12.10 machines) I add the following information in my /etc/resolv.conf file: nameserver 192.168.2.180 domain our.domain.com Normally, when I then ping a given host , .e.g: ping host01 It would resolve the FQDN to host01.our.domain.com However in ubuntu 13.10 this doesn't seem to be working, it just returns the following: ~# nslookup host01 Server: 192.168.2.180 Address: 192.168.2.180#53 ** server can't find host01: SERVFAIL Which is normaly since the DNS server doesnt respont to a 'host01' request. However if I do the same nslookup on an Ubuntu 12.10 machine it automatically appends the 'our.domain.com' suffix to whatever I throw at it that doens't already have this suffix. Is this a 13.10 bug, or am I doing something wrong?

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• keeping URL domain the same when pointing A record to a hosting account

  - by kwight

  Hello, I have a new WordPress website and a legacy billing system. For technical reasons, they cannot be on the same hosting plan. The hosting account for billing (and the original abc.com website) also manages DNS and mail. I'm trying to incorporate the new website under the same domain, eg. abc.com (website, on a different hosting account) and billing.abc.com (billing). I assume the answer is having a different A record for abc.com. I currently have a CPanel shared hosting account to use for the website (but can upgrade if necessary). How would I set this up in CPanel, so that the URLs work properly? Do I need a dedicated IP and then add the domain as an add-on domain? Thanks

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• Mac OS X Snow Leopard: permissions changed on /var results in dns lookup issues

  - by Ivan

  I was attempting to solve an issue ("/var/log/msmtp.log: permissions denied" error when attempting to send mail using msmtp) when I did this: > chmod -R 770 /var After that, my machine would not resolve domain names via cURL. (ping also fails) But, oddly, I can enter domain names into Safari and visit any web pages w/o a problem... I'm actually not sure if the chmod command is the cause of the problem, but I suspect it is. Also, if I ls -l on /var (or /private/var) it doesn't seem that any of the subdirectories or files there actually changed permission, but there are many, so I can't say that conclusively... Incidentally, I fixed the original error (msmtp.log permission denied) by setting TMPDIR=/tmp in my local environment (bash). Now the error goes away, but I get this error: msmtp: cannot locate host domainname.org: nodename nor servname provided, or not known Any ideas about how to go about getting DNS working again?

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• Mail on other server

  - by takeshin

  Here is the current DNS setup: mx.example.com 3600 A 93.157.123.73 example.com 3600 A 93.157.123.93 www.example.com 3600 A 93.157.123.93 mail.example.com 3600 A 93.157.123.72 smtp.example.com 3600 CNAME mail.example.com pop3.example.com 3600 CNAME mail.example.com imap.example.com 3600 CNAME mail.example.com panel.example.com 3600 CNAME panel.example2.pl www.panel.example.com 3600 CNAME panel.example2.pl ftp.example.com 3600 CNAME example.com mysql.example.com 3600 CNAME example.com pgsql.example.com 3600 CNAME example.com *.example.com 3600 CNAME example.com example.com 3600 MX 10 mx.example.com example.com 3600 NS ns1.example2.pl example.com 3600 NS ns2.example.pl example.com 3600 TXT "v=spf1 redirect=_spf.example3.pl" My client wants to have mail on his own server alfa.otherhost.com. Which entries do I have to update? Only the MX one? example.com 3600 MX 10 alfa.otherhost.com or: example.com 3600 MX 10 mx.alfa.otherhost.com Do I need to update POP, SMTP and IMAP entries too?

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• VPS DNS Resolution problem

  - by fatnic

  Hi. I've recently moved from a shared hosting to a VPS at vps.net but I think I might have broken it already! I have domain.com and domain.net. I have setup DNS records for both to point to my server. However, only domain.com pings to the correct IP address. domain.net is pointing to a different IP address. Possibly the old server it was pointing to. This has now been deleted. Is there possibly any way to correct this without having to submit a ticket to VPS.net?

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• Running dnsmasq as an authoritative DNS server

  - by Lord Loh.

  I am trying to implement a dynamic dns service for my computers. I have pointed h.lohray.com to my EC2 instance in the NS record of lohray.com and have installed dnsmasq on that system and have made sure to unblock the firewall port. For now, I have statistically added an entry on my /etc/hosts file. 129.118.19.163 i7.h.lohray.com however, i7.h.lohray.com does not resolve correctly with nslookup or dig :-( This is the only time I could have this resolved (online nslookup) - 50.19.103.190 is the IP address of the EC2 instance where dnsmasq is running. Where could I have gone wrong?

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