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• Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

  - by MadBoy

  I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose? I have an 2x Exchange 2010 server with one SMTP Sender with TMG 2010. TMG has 2 links connected so that we have 2 separate internet providers. The problem is I have no way to control TMG behavior on which link is used to send emails as it picks it randomly. I have 2 MX records: - mail.test.com which resolves to IP and IP resolves to mail.test.com - mail2.test.com which resolves to IP2 and IP2 resolves to mail.test.com This was done to prevent smtp banner issues but it provides problems with Reverse DNS if the server on the other side is eager enough to do comparison. But I've checked with Google and they also don't have that in perfect condition.

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• DNS queries to compromise DNS cache [on hold]

  - by Chris

  The transaction ID for DNS queries can take values from 1 to 65,536 and my computer pseudorandomly chooses one for each DNS request. If I sents 1,024 false replies per request, how many requests should I trigger to compromise the DNS cache with probability 99%? or as close tot hat as I can get. Thanks I'm getting a result of .6 requests which doesn't seem right to me. Feel as though it should be around 30

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• FTP could not connect after applying local DNS(private DNS)

  - by Rahul

  I made a software router in CentOS linux and in that made a DNS server. I am using centOS 6..4 for making DNS i applied following steps: changed the host name = abc.zoom.com and domain name = zoom.com. then did changes in the named.rfc.1912 file as per rename named.localhost = forward and named.loopback = reverse in forward lookups i changed zone "zoom.com" IN { type master; file "forward"; allow-update { none; }; and in reverse lookups i changed zone "x.168.192.in-addr.arpa" IN { type master; file "reverse"; allow-update { none; }; and then did changes in the named.conf file options { listen-on port 53 {192.168.x.x;}; 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; 192.168.x.x is my local DNS address. then i copied lookups file in /var/named and edited the file "forward" $TTL 1D @ IN SOA abc.zoom.com. rahul.abc.zoom.com. ( 0 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum NS abc.zoom.com. abc A 192.168.x.x and for " reverse" $TTL 1D @ IN SOA abc.zoom.com. rahul.abc.zoom.com.( 0 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum NS abc.zoom.com. x PTR abc.zoom.com. when i put the public ip details in the Eth0 it was automatically redirect in to the resolve.conf when i checked through dig command the answer, query all were 1. my system is itself a Software router.In gateway of my all local machine i give my system ip address. however my DNS and Gateway IP is same. Now the problem is that. i gave the static ips to all my local machines when i give the DNS which i made i.e 192.168.x.x that time my ftp is not connect in filezilla software E.g: host : pqr.zoom.com ("zoom.com" is my local domain name) username : pqr password : pqr gives an error: Error: Connection timed out Error: Could not connect to server but if i give the public DNS address it get connected. i want to solve this problem please give solution on this.

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• Configuring DNS on my Amazon AWS [closed]

  - by Ricardo

  So, I have an AWS EC2, and I need to configure a dns server, I have a Ubuntu 11.04 and webmin is configured, I have a domin point to my ip. So, know I need to redirect my domain to my ip and configure BIND dns server? What configuration I have to do to redirect my domain account to my ip and create my own dns server? I see some videos on youtube but, i don´t know what is the best of for me. Thank´s for any help.

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• how can I effect DNS Caching on PHP/Memcache application

  - by Niro

  In a very high loaded Ubuntu/PHP web server I found that the PHP line: $memcache-connect("int-aws_ec2.memcached.myapp.net",11211); sometimes takes ~5 secs. Replacing the url with the ip address decreases the server load from ~20 to 0 My question is - where are the settings that effect the DNS caching for this? Is it in the server level or the memcache library ? How can I change it ? Additional info: Ubuntu 10.04 lucid PHP: 5.3.2-1ubuntu4.10 Apache/2.2.14 (Ubuntu) Amazon EC2 Even more info per Celada's comment: The DNS handling for the memcache server is done by scalr (the platform I use to manage the cloud resources). They have a client located on the instances and their own DNS servers. /etc/nsswitch.conf - hosts: files dns /etc/resolv.conf: nameserver 172.16.0.23 domain ec2.internal search ec2.internal The domain is not in hosts.conf To check if I run nscd I used /etc/init.d/nscd stop and received 'no such file' so i guess I dont run nscd. Thanks !

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• DNS-Based Environment Determination

  - by zvolkov

  Found the following here. The questions is: where can I find more details on how exactly implement this on Windows? Any guide or how-to anybody? Or maybe you can provide your invaluable suggestions? Specifically, how do I make so that "all QA servers would first resolve entries in qa.example.com first and then if that lookup failed they would try example.com" (I'm a dev, not a DNS specialist, but our IT Support has refused to help on this:() Use DNS Based Environment Determination for your servers. Do this by initially splitting your top level domain into a number of sub domains depending on their function, and then creating DNS Service Names in each of the sub domains pointing to the relevant server for that service. Based on the list above we would then have: * clientdb.prod.example.com for Production * clientdb.perf.example.com for Performance Testing * clientdb.qa.example.com for QA * clientdb.dev.example.com for Development Servers then resolve entries in their relevant sub domain by function. That is, all QA servers would first resolve entries in qa.example.com first and then if that lookup failed they would try example.com. This allows you to have a single configuration entry for your client database hostname (clientdb) that would resolve correctly in all environments. This technique has the added advantage of still having global services defined in a common top level domain. This seems to be related to Providing "split horizon" DNS service. Reading that, I see that I will probably need separate DNS Server for each environment. Is this true or does Windows support some form of "tagging" the records to be visible depending on the requestor's IP?

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• Get IP network range after reverse DNS?

  - by Max

  For analytics purposes, I'm looking at large sets of IP addresses in server log files. I'm trying to perform reverse-DNS lookups to understand where traffic is coming from - e.g. what percentage of IPs resolve to corporations, schools, government, international etc. Despite a bunch of optimizations, individually reverse-DNS'ing every IP address still appears to be fairly expensive though. So - is there any way to obtain an entire range of IPs from a reverse-DNS? If yes, this could greatly reduce the number of actual reverse-DNS lookups. Example (numbers slightly obfuscated): Log file contains a request from an IP 128.151.162.17 Reverse DNS resolves to 11.142.152.128.in-addr.arpa 21599 IN PTR alamo.ceas.rochester.edu (So this is a visitor from Rochester University, rochester.edu) Now, would it be safe to assume that all at least all IPs from 128.151.162.* will also resolve to rochester.edu? What about 128.151.*.*? Is there a way to get the exact IP range?

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• Mass change DNS settings or at least identify by DNS

  - by tearman

  We have quite a few Windows based servers and I'm attempting to figure out either A. How I can change all of their DNS settings automatically (they all have local static IPs) or, failing that, B. at least query what their DNS settings are and sort by those that're using our old DNS servers. We have both SCCM and SCOM if that helps in the situation.

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• Windows Server 2008 Active Directory DNS setup

  - by Mister IT Guru

  I have to setup a small windows network inside my bigger linux/mac infrastructure. In order to get the windows clients logging onto the domain, I have had to make the DC their primary DNS server, which seems to have worked. I would much prefer to have one DNS server running on my network, or at least one authoritative server running on the network. I have a USG 200 router/firewall and I can configure some static records for DNS, but I an not sure what I need to put in order to get DNS and AD working together, and hints and tips appreciated.

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• DNS issue for internal website routing internet connection from remote location

  - by Michael Paul

  I have an issue that I could use some help with. Our company has a main location and a remote location. Previously, the remote location was connected to the main location through an internet connection VPN tunnel. The connection was pitifully slow at 1.5Mbps, so we upgraded it with a 75Mbps direct link. That meant the remote location lost it's internet access, so we routed their access through the main office internet connection. Everything works perfect except for one thing. The website we host is not accessible from the remote location unless the IP address is used. If I do NSLOOKUP on our website address from a machine connected to the main location network, it resolves correctly to the inside IP address. However, if I do the same from a remote location machine, it resolves to the website's outside IP address. Our internal DNS server(s) have a pointer and CNAME records set up, and everything was working perfectly before the connection was upgraded. In addition, the remote location has a domain controller, DNS server and DHCP server to service these requests at the remote location and prevent these requests from getting routed back and forth over the link. So I think was it happening is that for some reason the DNS server at the remote location is not resolving our website name correctly and passing the requests on to the routers, which then push the request out to the internet DNS system. That resolves the name to our external IP. This is purely a DNS issue, everything else works just fine. I am just stumped on this one. Any ideas on how to fix this? Edit: I forgot to mention that at the remote side of the link is a Cisco ASA-5505 and at the main office there is a Cisco ASA-5510. The link is connected between these 2 devices and the routing is handled in the 5510. Thanks, Michael

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• DNS requests failing from computers that can ping DNS server

  - by dunxd

  I have a situation where computers in some of our remote offices from time to time lose the ability to use our DNS server (in head office) to resolve hostnames. The offices are connected via VPN using Cisco ASA 5505 (VPNclient config rather than Site to Site). Ping to the IP address of the DNS server works. But nslookup will get a "no response from server" message. Computers in other locations can use DNS fine. This is an intermittent problem. One day/hour it works, another it doesn't. Other offices connected in the same way work when another doesn't. No config changes have been made on routers around the time we see the problem. Some users have reported that the problem goes away after doing a repair connection in Windows XP. I think this could be caused by the DNS cache being flushed as part of this - the Windows DNS cache makes the intermittent problem look less so because it caches failed lookups as well as successful ones. However, it is possible some other aspect of Windows is involved. Windows 7 clients have also had the same problem. Any pointers on deeper troubleshooting, or anyone else found this?

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• Suggested managed DNS provider?

  - by Arelius

  We own/manage a few domains (nothing too large or too trafficked). Currently our DNS servers are hosted onsite. For ease of management and lower-latency DNS requests we are interested in moving our Domains offsite, does anyone have recommendations for a good DNS provider?

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• Unstable DNS with bind

  - by yasser abd

  we have a Centos machine called jupiter, on which I have installed bind9, On every other machine the DNS is set to be the IP address of jupiter (192.168.2.101), as you can see in the output of the following command in windows >ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : mypcs Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetXtreme 57xx Gigabit Controller Physical Address. . . . . . . . . : 00-1A-A0-AC-E4-CC DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::c16d:3ae4:5907:30c4%8(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.2.98(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Thursday, September 20, 2012 10:26:11 AM Lease Expires . . . . . . . . . . : Sunday, September 23, 2012 10:26:10 AM Default Gateway . . . . . . . . . : 192.168.2.1 DHCP Server . . . . . . . . . . . : 192.168.2.1 DHCPv6 IAID . . . . . . . . . . . : 201333408 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-3A-50-01-00-1A-A0-AC-E4-CC DNS Servers . . . . . . . . . . . : 192.168.2.101 192.168.2.1 192.168.2.1 NetBIOS over Tcpip. . . . . . . . : Enabled All machines can always nslookup one of the domain (mydomain.com) that is set in the jupiter's DNS server, you can see that in the output of nslookup on the same windows machine: >nslookup mydomain.com Server: UnKnown Address: 192.168.2.101 Name: mydomain.com Address: 192.168.2.100 The problem is, sometimes mydomain.com can not be pinged, here is the output of the ping on the same windows machine >ping mydomain.com Ping request could not find host mydomain.com. Please check the name and try again. This looks very random, and happens once in a while, so the machine can lookup the DNS records but can't ping it, nor can browse the website that is hosted on mydomain.com, which should resolve to 192.168.2.100 On a linux machine that has the same DNS settings, the output of dig command for mydomain is as follows: $ dig mydomain.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.2 <<>> mydomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36090 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;mydomain.com. IN A ;; ANSWER SECTION: mydomain.com. 86400 IN A 192.168.2.100 ;; AUTHORITY SECTION: mydomain.com. 86400 IN NS jupiter. ;; ADDITIONAL SECTION: jupiter. 86400 IN A 192.168.2.101 ;; Query time: 1 msec ;; SERVER: 192.168.2.101#53(192.168.2.101) ;; WHEN: Thu Sep 20 16:32:14 2012 ;; MSG SIZE rcvd: 83 We've never had the same problem on MACs, they always resolve mydomain.com Here is how I have defined mydomain.com on Bind9's configs on Jupiter, notice that the name of the machine on 192.168.2.100 is venus, so I have this file: /var/named/named.venus: $TTL 1D @ IN SOA jupiter. admin.ourcompany.com. ( 2003052800 ; serial 86400 ; refresh 300 ; retry 604800 ; expire 3600 ; minimum ) @ IN NS jupiter. @ IN A 192.168.2.100 * IN A 192.168.2.100 /var/named/zones/named.venus.zone zone "mydomain.com" IN {type master;file "/var/named/named.venus";allow-update {none;};}; One thing to note is that I haven't defined reverse DNS lookups, only the forward DNS lookups are defined in Bind9 configs, not sure if that's relevant or not. So my question is, why is this being so unstable? what could be the cause?

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• Public DNS redirect subdomain to Windows Server 2003 DNS

  - by user125248

  I'm a programmer by trade but often dabble in sysadmin tasks and responsibilities. I have recently been tasked with setting up a Windows Server 2003 networking environment for a small business with multiple branches. The business already has a domain name they use to host a website at www.example.com. Currently the DNS nameservers are at Zerigo and I would very much like it to remain that way (as they specialize in just providing DNS services and they do this very well). We also have a bunch of other subdomains we use to conviniently connect to the various branches that have static IPs assigned from ISPs, so we're able to connect easily to branch1.example.com. Is it possible to 'redirect' all intranet.example.com DNS requests to a Windows box? I've been doing a little reading and I see there are NS records that might be able to do this, and the Windows DNS server could then perform all of the lookups for that subdomain, say, server1.intranet.example.com or client5.intranet.example.com. This would seem better to me, than registering a new domain name for the organisation, as keeping a single domain name makes more organizational sense.

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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 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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• 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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• OpenVPN DNS: VPN DNS stomping local VPN

  - by Eddie Parker

  I've finally noodled with OpenVPN enough to get it working. Even better, I can mount samba drives, ping network machines through the TUN device, etc - it's all great. However, I'm noticing that if I have the directive: push "dhcp-option DNS 10.0.1.1" # Push our local DNS to clients Then some of the machines that are normally visible by the client, on the client's side (i.e., not through the VPN) get masked with some other server out on the Internet. Is there any way to avoid this, besides hacking the 'hosts' file on the client machine? Ideally I'd like to only use my VPN's DNS for machines within that domain.

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• Free Dynamic DNS Nameservers

  - by Maxim Zaslavsky

  I recently set up a home server that I want to use as my primary hosting platform. So far, I've mapped some domains to it by setting up A records for them that point to my home IP. As my home IP can change randomly and without notice, however, I'm afraid of such downtime. Thus, I'm looking for a dynamic DNS solution. So far, I've set up DynDNS, but I haven't found a way to use dynamic DNS with an existing domain. Are there any free dynamic DNS nameserver services available?

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• OpenVPN DNS: VPN DNS stomping local VPN

  - by Eddie Parker

  I've finally noodled with OpenVPN enough to get it working. Even better, I can mount samba drives, ping network machines through the TUN device, etc - it's all great. However, I'm noticing that if I use the following directive, then some of the machines that are normally visible by the client, on the client's side (i.e., not through the VPN) get masked with some other server out on the Internet. push "dhcp-option DNS 10.0.1.1" # Push our local DNS to clients Is there any way to avoid this, besides hacking the 'hosts' file on the client machine? Ideally I'd like to only use my VPN's DNS for machines within that domain.

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• Mac OSX Server 10.6 DNS Issues

  - by dallasclark

  Hi, The server was upgraded from 10.5 from 10.6, during the upgrade the Reverse Zones were lost so I tried to recreate these but found that it's best to delete all zones, definitions and start again. So I've started again and Reverse Zones are appearing but I'm still having issues. I receive the following errors (if they help) 01-Nov-2010 12:52:01.254 client 192.168.1.52#57051: view com.apple.ServerAdmin.DNS.public: query (cache) 'server.dev.home.gateway/A/IN' denied 01-Nov-2010 12:59:24.487 client 192.168.1.52#52858: view com.apple.ServerAdmin.DNS.public: query (cache) 'earth.server.dev.home.gateway/A/IN' denied At the moment I have the following setup in the DNS 1.168.192.in-addr.arpa. Reverse Zone 192.168.1.100 Reverse Mapping MacPro-Server.local. server.dev. Primary Zone server.dev. Machine 192.168.1.100 earth.server.dev. Alias server.dev.

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• How to dynamically edit dns entries without restarting the dns server

  - by satish

  I am trying to host multiple sites on a single webapp in a tomcat server. For example www.abc.com, www.xyz.com and several sites fetch content from my webapp hosted on tomcat with apache as the web server. My web app is hosted at www.mysite.com. www.abc.com should forward to www.mysite.com?id=abc www.xyz.com should forward to www.mysite.com?id=xyz Can you tell me how to configure dns entries, apache and tomcat configuration to achieve this scenario?? These site will have to be added dynamically! so is there any way to update the dns entries dynamically without restarting the dns server ... and similarly for apache and tomcat also?? Thanks very much in advance

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• Virtual DNS recommended setup...

  - by luison

  Hi. We are new to virtualization which we are setting up with Proxmox VE (OpenVZ + KVM). I am a bit lost about the recommended DNS forwarder config specially in the OpenVZ (Virtuosso type) of enviroiment. Our intention was to have a small dnsmasq running in one of the VM acting as backup DHCP server and serving our in-office local addresses (and PCs) by an additional resolve.conf file which dnsmasq supports, but I've read that all VM should share DNS pointing to the host machine in which case it would make more sense having it there. My problem is that I would like to have as least as possible apps in the host so a reinstall of the environment (porxmox ve) and a machine restore can be as quick as possible. Does anyone have a similar setup? Does it make sense to have the 1st virtual machine running the local dns forwarder? Also... dnsmasq seems to want to have root permissions when running on an OpenVZ container... are there any work arrounds anyone knows for that.

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• Mac OSX Server 10.6 DNS Issues

  - by dallasclark

  The server was upgraded from 10.5 from 10.6, during the upgrade the Reverse Zones were lost so I tried to recreate these but found that it's best to delete all zones, definitions and start again. So I've started again and Reverse Zones are appearing but I'm still having issues. I receive the following errors (if they help) 01-Nov-2010 12:52:01.254 client 192.168.1.52#57051: view com.apple.ServerAdmin.DNS.public: query (cache) 'server.dev.home.gateway/A/IN' denied 01-Nov-2010 12:59:24.487 client 192.168.1.52#52858: view com.apple.ServerAdmin.DNS.public: query (cache) 'earth.server.dev.home.gateway/A/IN' denied At the moment I have the following setup in the DNS 1.168.192.in-addr.arpa. Reverse Zone 192.168.1.100 Reverse Mapping MacPro-Server.local. server.dev. Primary Zone server.dev. Machine 192.168.1.100 earth.server.dev. Alias server.dev.

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• Simple, manageable DNS on EC2?

  - by dkulchenko

  I'm working on a large network of servers sitting on EC2, and need a way for the servers to know about each other's locations in the cloud. I thought the simplest way would be to use DNS, because if I replace the EC2 instance, I simply update the DNS record, and the rest of the servers will know about it (with names like users.db.mysoft.com, routing.mysoft.com, cluster1.memcached.mysoft.com). I'm considering setting up a master DNS server on a micro/small instance to accommodate this. I'd preferably need something that's as simple as a key-value store (hostname - IP) into which the platform could remotely add/remove entries. Can I do this with BIND? Or is there a better solution?

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