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• Configuring DNS & MX records for exchange 2010

  - by Mahmoud Saleh

  i am trying to configure Exchange Server 2010 on Windows Server 2008 R2 to receive emails from the internet following the danscourses tutorials: and i followed this video for the DNS & MX records: http://www.youtube.com/watch?v=jdf_3DRssks i don't have any windows administration skills, and i am stuck with the DNS configuration. and the following are my domain configuration i got from the hosting. following are the steps i made: 1- Add new name server: add ns1.centors.com ip Exchange Server Public IP: 41.233.26.131 2- Change the A record change it to point to the public ip address Exchange Server Public IP: 41.233.26.131 3- New cname record for www and make it resolve to centors.com 4- New mx record for mail.centors.com 5- New A record for mail.centors.com: name: mail ip: Exchange Server Public IP: 41.233.26.131 6- new A record for ns1: ip: Exchange Server Public IP: 41.233.26.131 7- i made port forward in the router for SMTP and POP3 to the exchange server local ip address. ISSUE: i have a user account in the active directory, and the user is member of the domain, the user is [email protected] and when trying to login with this account in outlook 2010 on other machine using following data: account type: POP3 incoming mail server: mail.centors.com outgoing mail server: mail.centors.com i always get the error: Authorization failed, check your server settings. please advise what's wrong with the configuration, thanks in advance.

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• postfix concurrency limit with round robin dns

  - by goose

  Take the following internal round robin dns setup mymta.com. IN A 172.31.1.1 mymta.com. IN A 172.31.1.2 mymta.com. IN A 172.31.1.3 mymta.com. IN A 172.31.1.4 mymta.com. IN A 172.31.1.5 mymta.com. IN A 172.31.1.6 mymta.com. IN A 172.31.1.7 mymta.com. IN A 172.31.1.8 mymta.com. IN A 172.31.1.9 mymta.com. IN A 172.31.1.10 Now assume the following postfix setup (assume these are the only tweaks from defaults in debian package) main.cf: smtp_connection_cache_destinations = mymta.com smtp_connection_cache_reuse_limit = 750 smtp_destination_concurrency_limit = 75 transport * :[mymta.com] I would expect 75 concurrent connections spread across the 10 A records I've set in DNS. However I'm seeing more than a few hundred connections to mymta.com and I'm wondering if Postfix is "smart" enough to set up 75 concurrent connections for each IP address. Thoughts?

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• Widespread misinterpretation of DNS rules in resolving wildcards

  - by Dominic Sayers

  [EDITED to add: This problem has gone away on its own. I believe Cloudflare's name resolution may have been to blame. See my own answer below] Here is a snippet of my zone file *.example.com. 300 IN CNAME proxy.herokuapp.com. foo.example.com. 300 IN A 111.111.111.111 If I dig @8.8.8.8 foo.example.com I get the answer I expect: ;; ANSWER SECTION: foo.example.com. 30 IN A 111.111.111.111 The same is true of all other public DNS servers I've tried. However, when I try to set up a check with Pingdom to a URL on foo.example.com it instead sends the traffic to my Heroku app referenced by the *.example.com RR. The same is true of checks set up on New Relic, Errplane and traffic generated by the Heroku app itself. So on the one side, all public DNS servers interpret the zone file one way. Yet four service providers all interpret it a different way, one that differs to the standard suggested by RFC 4592. My question is: are these reputable, mature service providers all wrong? Or is it little me?

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• Internal/External Moodle - DNS

  - by Chief17

  Network diagram: I have a moodle (a VLE) setup that I want to be internally and externally accessible. The green route on the diagram below is the route I would like the traffic to take when the user is inside the LAN, and the red route is seemingly what it does take. The website has a domain name (like most websites do). From the User PC, if I ping the domain name, I get the internal IP of the webserver (because of a hosts file entry), if I nslookup the domain name I also get the internal IP of the webserver (because of an A record on my DNS server). Running the same two commands on the webserver gives me the webservers external IP. (going well so far) If I use PHPs gethostbyname() on the moodle website and use domain name as a parameter (getting php/apache to resolve the hostname) it returns the exernal IP of the webserver (good news, DNS seems to be doing what I want it to). All things so far seem to be going well. The only thing that is confusing me and preventing the moodle single sign on from working is the fact that if I get moodle to show my IP address, it says that it is an external one (outside my NATting firewall) when it should show an internal IP. This is the issue, any ideas on how to go about resolving this? Any ideas on tests I can perform (I have also tried a tracert and the request goes directly to the webserver), anything? Thanks all!

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• Which DNS settings are used when setting up your server

  - by Saif Bechan

  I have a server and want to run my own name server service. Now I have set it up already and it works not, but I do not know where the exact settings are stored. On my server I use Plesk. When I edit DNS settings there I think it is stored in named.conf. Named is installed on the server, and BIND. Now I also have a panel from my registrar. This is separate from my server. Both places I can add the normal MX,A,CNAME, etc records. Now where is the best way to place this settings. Currently I have the same records on both places, on the server and at the registrar panel. I am correct to just add all the records at the registrar panel, and remove everything from within PLESK, and just don't run DNS on my server, because it is already done in the registrar panel. Or should I add the records in both places.

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• Problems forwarding zone to another DNS server.

  - by sebastian nielsen

  I have a authorative DNS server at 83.248.21.18 which are authorative for the domain "finahemgoteborg.se". Now my registrar is requiring me to have 2 DNS servers for the domain, so I would now want the machine 85.228.103.141 just forward all incoming queries for "finahemgoteborg.se" to the 83.248.21.18 server. In the 85.228.103.141 BIND server, I have the following config: zone "finahemgoteborg.se" in { type forward; forwarders {83.248.21.18;}; }; But the problem is that 85.228.103.141 is still responding with "REFUSED" when querying it for example www.finahemgoteborg.se A record. How can I fix it. I do NOT want to set up a master/slave situation, just one nameserver that forwards to a another. Edit The Rest of named.conf: options { directory "/var/cache/bind"; version "none"; allow-recursion {"none";}; minimal-responses no; }; zone "sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "ns1sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "ns2sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "finahemgoteborg.se" in{ type forward; forwarders {83.248.21.18;}; };

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• Proper DNS records for handling subdomains and missing subdomains

  - by Cerin

  I'm trying to craft DNS records to support: Explicitly defined subdomains, e.g. ftp.mydomain.com A missing subdomain that redirects to www. Implicitly defined subdomains, e.g. <some user entered value>.mydomain.com For 1, I'm using CNAME records. All seems to be working well. For 2, I'm using an A record, @ -> 123.456.789.012. Worked well. For 3, I ran into some trouble. I tried adding another A record, * -> 123.456.789.012. This appeared to work initially, but it broke #2. i.e. now browsing to mydomain.com doesn't redirect to www.mydomain.com. I tried adding the CNAME record @ -> 123.456.789.012, but my DNS admin tool won't accept it because it's saying the @ is already in use, even though I deleted the A record using it. Am I configuring this incorrectly? What am I doing wrong?

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• dns in a small network with router and AD domain

  - by Felix

  I have a small office network with router (running OpenWRT), Windows Domain Controller (used to be 2008R2; I just backed it up and upgraded to 2012), about a dozen AD clients (3 server and windows workstation) and several non-AD clients (network printer, PBX). The problem is that the clients can't access servers by name (only by IP). I tried all kind of permutations. Right now domain controller runs DNS server for all desktops; but unless I put an entry in hosts file - I can only get by IP. I have router as DHCP server (since not all devices are on AD); and except for Domain Controller all IP addresses, including "static", are assigned by the router. Most frustrating, some servers sometimes just work! for example, I can often get to the Linux box by name (it is part of Domain using Beyond Trust Integration Services); but I can never get to SQL Server box. Seems like non-domain devices see more names than domain members... This network should be fairly typical; but I couldn't get any guidance about how to set up DNS/DHCP service to make all nodes happy. The closest is this question, but still it's different! Thanks

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• Dns - wildcard vs. cname subdomains

  - by Matthew

  Alright I have to admit I'm confused with how DNS works. I've always just added things until they worked, and now it's time to learn how they work. So one confusing thing to me is that there's sort of two places I can have records. I have an account with rackspace cloud servers. And then there's the place I registered the domain. But both allow me to edit DNS records. Should I do everything at both places or is one better than the other or am I missing the point? Subdomains confuse me too. I'd like to be able to just have a wildcard subdomain (I've done this in the past.) I just don't like the idea of adding a cname record or A record every time I need a new subdomain. Then I read this and it says: The exact rules for when a wild card will match are specified in RFC 1034, but the rules are neither intuitive nor clearly specified. This has resulted in incompatible implementations and unexpected results when they are used.

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• Router that allows custom Dynamic DNS server [closed]

  - by Thuy

  I've made my own DDNS service and it works fine using an application running on clients to update the IP. But if for some reason I don't have the choice of using my software and instead I need to use a router to update the IP, it becomes troublesome. For example, I needed to setup IPsec from a customer to me and the customers router/firewall (netgear srx5308) has a dynamic IP which is given from the ISP which can't offer static IPs. So it needs to use dynamic dns for it to work. In this case there really isn't a client to run the software on since it's a router/firewall. Unfortunately it seems that most routers are rather unfriendly towards custom DDNS solutions and most offer only dyndns.com or similar templates. Which was the case with this router too. Leaving me with no way to use my own dynamic dns server IP. I have the option of switching out the customers router and I've been looking around for alternatives and other routers/solutions and I was wondering if anyone on this great site might have been in a similar situation or might just know about some router/firewall that is more friendly towards custom ddns solutions that I might be able to use. Thanks in advance for any help or guidance!

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• SBS 2008 - DNS Forwarders timing out.

  - by Moif Murphy

  Hello, We have an SBS 2008 server that keeps losing connection to the internet approx 2-3 times a day. It's a simple setup, BT Business Broadband ADSL to a Wireless Zyxel router to the server. Clients connect via WiFi from their laptops. Plugging ethernet in makes no difference, only a reboot of the router seems to bring everything back again. I'm looking at the forwarders on the DNS properties page and they're timing out when trying to resolve the IPs. Currently there are two IPs in there, 194.72.9.34 which has timed out and 194.72.9.38 which has finally resolved to ns8.bt.net We've been in there and replaced all media, installed a PCI NIC, have changed the router three times. There are no errors in the DNS event logs pertaining to what's going on. We've also been on to BT who are adamant that it's not their end. Could someone shed some light on what could be going on or where else to look in the configuration of the server? Thank you.

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• Cant configure DNS properly on centos

  - by Nuker

  I am on a VPS i must manage my own. I have network problems because in the last days many of my users report they cant enter my site from my domain and seems like Google and Facebook cant either (this never happened before). However i can enter my site without problems and so many other people as well. So i tested by making a php include like this <?php include 'http://mysite.com/somepage.php'; ?> and i get this error: Warning: include(): php_network_getaddresses: getaddrinfo failed: Name or service not known in I even tried by including content from yahoo.com or facebook and didnt work either. However the includes will work if i use IPs instead of domains. Do i have a DNS problem or something? What can i do to fix it? Im on a Linux 2.6.32-431.11.2.el6.x86_64 on x86_64 CentOS Linux 6.5 I have this on my resolv.conf # Generated by NetworkManager # No nameservers found; try putting DNS servers into your # ifcfg files in /etc/sysconfig/network-scripts like so: # # DNS1=xxx.xxx.xxx.xxx # DNS2=xxx.xxx.xxx.xxx # DOMAIN=lab.foo.com bar.foo.com nameserver 8.8.8.8 nameserver 8.8.4.4 Thank you.

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• Providing access to a no-www website in an active directory environment

  - by oasisbob

  Our website is hosted externally, off our network. The canonical URL is a is intentionally lacking www, and will 301 redirect any requests containing www to the canonical URL. So far, so good. The problem is providing access to the website from within our LAN. In theory, the answer is simple: add a host record in DNS pointing foobarco.org to the external webhost. (eg foobarco.org -- 203.0.113.7) However, Our active directory domain is the same as our public website (foobarco.org), and AD appears to periodically auto-create host (A) records in the domain root corresponding to our domain controllers. This causes obvious problems: users on the LAN attempting to access the website resolve the domain controllers instead. As a stop-gap measure we're overriding DNS using the hosts file on clients, but this is a quick hack that doesn't scale well. The hosts-file hack hasn't broken anything obvious, so I doubt that this behavior is essential to AD operations, but I haven't found a way to disable it. Is it possible to override this behavior?

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• BIND9 Forwarding by view

  - by Triztian

  Hi I think this is a simple issue, I'd like to forward only to certain IPs in the LAN network, for example I have 2 acl lists: acl "office1" { 192.168.1.15; // With internet access }; acl "production" { 192.168.1.101; // No internet access }; I know that there probably should be more efficient ways to restrict internet access, but at the moment this is what I'd like to try.Here's what I've tried in named.conf.local // Inlcude my acl definitions include "/etc/bind/acls.conf"; view "no-internet" { match-clients { production; }; include "/etc/bind/named.conf.default-zones"; zone "localdomain.com" { type master; file "/etc/bind/db.localdomain.com"; }; zone "1.168.192.in-addr.arpa" { type master; file "/etc/bind/db.192.168.1"; }; } view "internet" { match-clients { office1; }; include "/etc/bind/named.conf.default-zones"; forwarders { 201.56.59.14; // Made Up 201.56.59.15; // Made Up }; zone "localdomain.com" { type master; file "/etc/bind/db.localdomain.com"; }; zone "1.168.192.in-addr.arpa" { type master; file "/etc/bind/db.192.168.1"; }; }; As you can see I want a localdomain.com defined for every computer in my network and forward internet access to the computers in the office but not to the ones on the production floor. I've modified my conf file, however the IP in the "no-internet" acl is able to resolve the domains, even though I've rebooted the computer, flushed the DNS using ipconfig /flushdns and set my DNS Server as the only one, why is this still happening? Thanks in advance.

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• Which DNS settings are used when setting up server

  - by Saif Bechan

  I have a server and want to run my own name server service. Now I have set it up already and it works not, but I do not know where the exact settings are stored. On my server I use Plesk. When I edit DNS settings there I think it is stored in named.conf. Named is installed on the server, and BIND. Now I also have a panel from my registrar. This is separate from my server. Both places I can add the normal MX,A,CNAME, etc records. Now where is the best way to place this settings. Currently I have the same records on both places, on the server and at the registrar panel. I am correct to just add all the records at the registrar panel, and remove everything from within PLESK, and just don't run DNS on my server, because it is already done in the registrar panel. Or should I add the records in both places.

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• Merging two separate DNS zones

  - by cube

  This is a hypothetical question. Let's suppose I have two networks, each with its own DNS server. Network A has names a1.local, a2.local, ... and network B has b1.local, b2.local, .... Zone file for each of the networks looks something like this: $ORIGIN local @ IN SOA .... blah blah blah a1 A 1.2.3.4 a2 A 2.3.4.5 ... for A, and $ORIGIN local @ IN SOA .... blah blah blah b1 A 3.4.5.6 b2 A 4.5.6.7 ... for B. Now I also have a regular internet domain example.com and I want to access the machines as a1.A.example.com, b1.B.example.com, ... How will I have to change the configuration of name servers in networks A and B? (in fact I am writing a super-magic DNS server, currently serving A and B separately, but there is a chance that I will have to add the ability to merge the networks; so I'm interested in knowing the problems which lie ahead of me and how to prepare for the possibility)

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• DNS no longer works after server reboot

  - by Burning the Codeigniter

  Strangely enough, when I reboot my Ubuntu 12.04 server, the DNS no longer works, which makes the domain unavailable to access to my site. Normally the DNS should be working after a reboot, but this doesn't happen anymore. I use nginx to serve content, but nginx is already configured to work with my domains. What are the typical practises must I do after a reboot and how can I solve this issue I experience? I already have BIND, networking and resolvconf to boot when the server boots up. ; <<>> DiG 9.8.1-P1 <<>> mysite.com ;; global options: +cmd ;; connection timed out; no servers could be reached This is my output with dig $ttl 38400 mysite.com. IN SOA ns1.mysite.com. webmaster.mysite.com. ( 1055026205 6H 1H 5D 20M ) mysite.com. IN A xx.xx.xx.xx # Server IP *.mysite.com. IN A xx.xx.xx.xx # Server IP www.mysite.com. IN CNAME mysite.com. ns1.mysite.com. IN A xx.xx.xx.xx # Server 2nd IP ns2.mysite.com. IN A xx.xx.xx.xx # Server 3rd IP mysite.com. IN NS ns1.mysite.com. mysite.com. IN NS ns2.mysite.com. mail.mysite.com. IN MX 1 mysite.com. This is the contents of /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 85.17.150.123 nameserver 85.17.96.69 nameserver 62.212.64.122 search localdomain After using more dig commands, outputs: ; <<>> DiG 9.7.3-P3 <<>> @85.17.150.123 mysite.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 24847 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;mysite.com. IN A ;; Query time: 2145 msec ;; SERVER: 85.17.150.123#53(85.17.150.123) ;; WHEN: Mon Nov 5 16:31:32 2012 ;; MSG SIZE rcvd: 30 ; <<>> DiG 9.7.3-P3 <<>> @85.17.96.69 mysite.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 27879 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;mysite.com. IN A ;; Query time: 949 msec ;; SERVER: 85.17.96.69#53(85.17.96.69) ;; WHEN: Mon Nov 5 16:32:59 2012 ;; MSG SIZE rcvd: 30 ; <<>> DiG 9.7.3-P3 <<>> @62.212.64.122 mysite.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 29293 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;mysite.com. IN A ;; Query time: 825 msec ;; SERVER: 62.212.64.122#53(62.212.64.122) ;; WHEN: Mon Nov 5 16:33:39 2012 ;; MSG SIZE rcvd: 30 With Google DNS (8.8.8.8): ; <<>> DiG 9.7.3-P3 <<>> @8.8.8.8 mysite.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 38498 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;mysite.com. IN A ;; Query time: 3982 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Mon Nov 5 16:37:27 2012 ;; MSG SIZE rcvd: 30

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• What DNS server to use for dynamic load-balancing of website?

  - by Marki555

  I will have 2 servers in different datacenters (different countries) and I want to use DNS load-balancing mainly for High Availability of website hosted on those 2 servers. It is just ad tracking site, which records hit in local database and returns few lines on html code. I want to return 2 A records each time because of DNS pinning in browsers (if one server fails, browser will try second A record which it has already cached). Both servers will be acting also as DNS servers for redundancy. Now comes my proposed solution: I will use BIND and have both servers as a master for that zone. On each server there will be running script, which will periodically test availability (http) of both servers and remove IP from DNS in case of failure. Now the questions :) 1) Is BIND suitable for this solution? I think BIND performance is good and it is easy to manipulate the zone file via script. And as I will modify the zone only in case of failure/maintenance, the modifications (and thus bind reload) won't be often. 2) I plan to use TTL of 5 minutes. The website will have about 1000-3000 req/s but from distinct clients (each IP only 1-3 requests), so I think the DNS load won't be too much. I suppose their ISPs will cache the responses for those 5 mins. Is there any reason to lower the TTL even more? 3) Is my master-master approach good? Or should I make one of the servers master and the other one slave? Right now each server can monitor both itself and the other one. If only webservice fails, both DNS nodes will notice it. If the whole server fails, then the remaining DNS node will notice it and the failed node will not answer DNS queries anyway. 4) Is it a big issue when one NS server does not respond to queries? If yes, I can make a third DNS, so anytime at least 2 of them would accept queries... 5) Should I rewrite the zone file via script, or just use dynamic DNS update (for example via nsupdateutility)?

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• DNS Client Event 1012: Error reading local hosts file

  - by Sam

  My notebook boots extreme slowly and shows loads of the following error in the event log: Error reading local hosts file Source: DNS Client Events EventID: 1012 The computer is quite new, I kind of just finished installing. So I don't feel like installing everything again (especially since this probably would result in the same problem anyway). Any idea how to resolve this? Thanks, Sam

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• Website occasionally unavailable - DNS problem

  - by Kamil

  Hi, I have a problem with my website. I have webmin and virualmin. I have one domain as alias, and this alias sometimes is unavailable for several minutes. It's probably DNS problem because chrome shows 105 (net::ERR_NAME_NOT_RESOLVED). How can I troubleshoot this problem?

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• Set up DNS or F5 VIP to send traffic to a specific port

  - by Sam

  I have a clustered SQL instance set up at SERVER01\dev08 It's assigned to a static port of 1466. Can I set up something which will let users connect to SERVER01 and hit that port? If this is possible, what problems might it create (all traffic coming to this name hitting only one port)? It seems that DNS has nothing to do with ports - nor does the F5 big IP.

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• Problem with Macbook air automatically not acquiring free wifi network dns or router address

  - by Rumsfeld

  I have this problem when my macbook air sometimes does not connect to free wifi hotspots. When the problem happens and I try to run the diagnostics, it normally gets to yellow network settings tab. It seems that it for some reason does not acquire automatically the router or dns address. Sometimes after I shut it down and restart it magically connects to the wifi hotspot but it is very inconsistent. Anyone knows a fix for this problem?

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• DNS on window server 2008

  - by sysprep2010

  Hello everyone in superuser, I am a big geek. I have an IBM x306 server at home, and i bought window server 2008 text book and lab book. I am hoping I am asking this question correctly if not I am sorry. I don't want to pay for a DNS, is there any free webstes out there? Thank you

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• DNS on window server 2008

  - by SysPrep2010

  Hello everyone in Server Fault, I am a big geek. I have an IBM x306 server at home, and i bought window server 2008 text book and lab book. I am hoping I am asking this question correctly if not I am sorry. I don't want to pay for a DNS, is there any free webstes out there? Thank you

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• DNS servers and load balancing

  - by RadiantHex

  Hi there! I'm wondering if a simple DNS server could offer, even a limited amount, of load balancing capability. I have a couple of servers and I've been told that multiple IPAddresses can be associated with one domain. Help would be very much appreciated!

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