Server :: Can't Resolve MX Records - Zone File?

May 30, 2011

I am no expert when it comes to BIND. I seem to be able to resolve NS and A and TXT records for my domain, but I cannot get the MX records to come out. Does anyone have an idea what might be wrong with my BIND zone file? I wonder if it might have something to do with the fact that my IP is currently on a policy Block List?


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Server :: Not Able To Write In Zone File / Resolve This?

Jul 1, 2011

This is the entry which iam seeing in my /var/log/messages. code...

because of the issue now i cant able to write the zone file, via my application. it possible to resolve this issue!

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Debian Configuration :: DDNS (dhcp+bind9) - Wrong PTR Records In Reverse Zone?

Jun 3, 2011

I've configured my dhcp server to update dynamically the DNS zones of BIND9 name server. Everything works ok, except for reverse nslookup:



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Server :: Create A Zone File?

Nov 12, 2010

1.How create a Zone file
2.Named.conf file conf...
3.Dig check is not working......

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Server :: Comparing Zone File Counting And Same Name

Mar 29, 2011

I want to compare zone file counting and same name, not records etc of master and slave dns server so that i sure both server contains same copy of the files at a time. Any utility to compare such files in linux?

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Server :: Script To Change TTL Of All Zone File?

Jul 13, 2011

I need to script to change TTL of all zone file in my DNS and aslo i require the serial to be updated to reduce my work load.

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Server :: DNS Merge / Intercept Queries From Zone File

Jun 4, 2010

I chose -Server-, if this is more appropriate in -Networking-, just let me know. Basically, I need to be able to merge responses stored in a zone file with responses from an "upstream" authoritative server. I'm in the sad position of needing to "intercept" requests to *part* of a domain (but not restricted to a sub-domain!) and return results for *some* hosts that use an internally routed address, and results for the rest using the public internet addresses. Unfortunately, it's not my domain, so I can't just use views (although I suspect they could end up having some part to play in this, at least potentially)... but instead I have to actually send requests recursing to the other site's external DNS for any hosts my server doesn't have records for in the zone file.

Some background on the situation:
I work at a local government, which has a private link / VPN connection to a state government entity, and needs to use internal addresses for some of the state servers, which then get routed over an "internal" network link. But the state uses the same domain name internally and externally, just presenting views to internal clients vs. external clients. -- However, we are only being allowed access to certain of their servers through the internal link, which means that for any other servers that we don't have internal/private access for, we have to visit the public addresses just like anyone else on the internet... So, I can't just send all requests to their internal DNS and get responses, because we'd get IPs for some servers (e.g. their main web site) that we wouldn't then be able to reach using the internal network link.

For Example: Say I have a client machine, "client1", on my network (""), which uses "" for name resolution ... and which needs to access 2 servers on the state network, "" and "" -- so named based on how "" needs to access them.

The external state DNS server/view ("") responds to requests with something like: -- --
(Those are just crap addresses, obviously.

The internal state DNS server/view ("") responds to requests with something like: -- --
This works on their network because their own clients have access to all such IPs.

But for us, they only allow traffic flowing between "" and their internal network to reach the address, blocking all other address destinations. So, when "" asks "" for the address of "", I need "mydns1" to recurse out to "" to get an answer ( and then return that IP to "client1" -- because "" is blocked from accessing the server's address. But, when client1 asks mydns1 for "" I need to pull the IP ( from a local zone file instead of asking either of the state DNS servers -- or optionally forward the request to "" I suppose -- because the state blocks access to certain services (which we need and are the whole cause of this problem!) via the public ( address.

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CentOS 5 Server :: Create A,NS And MX Record - Where The DNS Zone File

Apr 11, 2011

I just ordered a new unmanagd VPS I have already Apache, PHP and Mysql the only problem I have now is how to create a A,NS and MX record in CentOS. I dont know where the DNS zone file is in CentoS

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CentOS 5 Server :: Unable To Recover Zone File From Ns To Apnic

Feb 17, 2010

I have installed a centos 5.4 server with Bind services running on the 2 servers.but getiing error "the working directory is not writable". while restarting the named services.

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CentOS 5 Server :: Reverse Name Resolution Zone File Didn't Create By Default

Oct 19, 2010

I install a Bind 9 with chroot in Centos 5, but the issue is the Reverse Name Resolution Zone File didn't create by default like other zone files, so i look into /var/named directory i don't find the reverse name resolution zone file even if i add this zone on named.conf

zone "" IN {
type master;
file "";
allow-update { key "rndckey"; };
notify yes;

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Server :: Dns And Multiple TTLs - Specify Different TTLs In The Zone File?

Feb 7, 2011

My question is about DNS use of the $TTL directive. I realize the $TTL directive stands for TimeToLive, my question is why would you specify different TTLs in the zone file? I have a zone file with

$TTL 300
TTL 3600


I'm not sure why you just wouldn't specify the same TTL for all systems or at least not have all the 300's grouped together and all 3600s grouped together. The file I'm looking at has about 12 different groups of 300 and 3600 TTLs.

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Programming :: Loop Through Records In A File?

Apr 23, 2011

I want to loop through the records in the below file (homedir.temp)

I want to do the following activities with each record1. du -s - to get the total usage for that directory (my variable name is SIZE)2. divide SIZE by du -c for /home to get the percentage of usage. (my variable name is PER)3. write the directory, SIZE, PER to a filePROBLEMI am using the below for loop: for record in homedir.tempthe mentioned activitiesdonehe above is not looping through the records. It does the first record perfectly and exits the loop.

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Programming :: Parse A File Containing Billions Of Records?

Nov 17, 2010

I have to parse a file containing billions of records and populate them in the Data structure. I have used a lot of C++ class and creating objects of the class I am storing the information retrieved by parsing the file.

Now as the file become huge and number of objects become very large my code is getting bad_alloc error as it is not finding any space avalable in the heap for allocating new object.

Is there any way to parse the file?

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OpenSUSE :: Records Desktop Activity As A Video File?

Jun 24, 2010

I would like a program that records my desktop activity as a video file. Do you know any nice program to do that? Moreover it would be nice afterward to insert this video the openoffice or microsoft's powerpoint. Do you know what is the "best" video format that guarantees the biggest interoperability (the ability the video to play in different platforms).

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Server :: Migrate DNS Records From Old To New?

Nov 3, 2009

Our hardware that is running DNS is very old (Pentium 1 Redhat release 6.2), and I want to migrate the DNS Records to a new computer (Pentium 4 Debian Lenny). There is no GUI environment on the old server: no Gnome or KDE. I may consider using VMware Workstation for this project.

1. I don't have very much DNS experience. Is this a painless process?

2. Are there commands that I can run to export the DNS records from the old server?

3. Are there commands that I can run to import the DNS records to the new server?

4. What other advice do you have that could help this process?

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General :: Grep - Manipulating Large Text File Full Of Records

Nov 26, 2010

I'm trying to manipulate a large text file full of records (metadata - one complete record per line). I need to delete every line on which certain words appear - there are five different words, all pretty simple all-caps strings with occasional whitespace. I tried using grep -v, which worked a treat, but only string-by-string. Ideally I'd like to run this as grep -v -f, where the file targeted by the -f contains the strings I need to match in order to delete the lines they're in.

i.e. grep -v -f filecontainingSTRINGS.txt targetfile.txt > outputfile.txt

When I try this, however, I don't get any matches - or more specifically, no changes are made in the output file. It works fine if there's only one string in filecontainingSTRINGS, but it doesn't work if there's more than one (I'm using newline as the delimiter). (Also my machine doesn't recognise /usr/xpg4/bin/grep - no idea what that's all about!)

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Server :: Command Line Tool To Add User Records To LDAP?

Jun 11, 2010

I'm looking for a script or a tool I can use from the command line, non-interactively, to add users to our LDAP server.

I could write a wrapper for ldapsearch, ldapadd and ldapmodify, or write something from scratch in perl, but I imagine someone has done this already.

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Server :: Zone Minder USB Web Cam Not Working?

May 24, 2011

I am wanting assistance with getting Zoneminder working under ubuntu 11.04.I have ran the install and setup the settings via http://ipaddress/zmadded the camera re instructions.I cannot view anything via Zone Minder.Cam is a Logitech Pro 5000

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Server :: BIND9 Conf And Zone Files?

Sep 20, 2010

The thing is, I've created a new local zone here (called "local.lan"), and, aparently, it is working fine, and DHCP3-SERVER is updating DNS info through the controls.But sometimes I get some strange answers from the server, like when I do the "arp" command in one of the clients, and get the server's hostname "mixed" with it's own reverse, like this: "dns.local.lan.2.168. | ether | 00:02:1e:f5:61:74 | C | eth0". Other thing is that sometimes my DNS don't update when a computer "enters" the lan. In the /var/log/syslog the DHCPOFFER appears, but the information about the DNS update isn't there.So, I would like to show you my named.conf file and my local zone db file, and get some feedback from you (what would you change... what is wrong...).

# ------------------- #
* named.conf:
# ------------------- #


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Server :: How To Configure Reverse Zone For X.x.x.x/18 Subnet

Feb 24, 2011

how to configure reverse zone for x.x.x.x/18 subnet ,all the example on the internet are for /24 or /16 subnets?

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OpenSUSE Network :: Dns Server Fail To Load Zone?

Mar 21, 2010

I have a DNS server with 3 zonesone is dynamic with an associated reverse and one is static
Everything was fine until I added a single host in the staticzone then the server stopped resolving names in that zoneThe only way I could get it to work again was delete the whole zone and re enter the zone and hosts

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Networking :: Run Script In EST Time Zone But Server In GMT / Achieve This?

Apr 4, 2010

I have a server which time zone is in GMT format. I have a user which is also get time zone variable in GMT. But I want to run script which will start from crontab in EST time zone. For that I�m not suppose to give extra entry in crontab. May be it would be in script.

How can I achieve this?

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Server :: Bind And CNAME - Configuring Second Level Zone?

Dec 9, 2010

It's possible to configure a second level zone like this:
IN CNAME www.domain2.ext
For example, if I want:
host domain1.ext -> CNAME of www.domain2.ext?
and NOT only www.domain1.ext -> CNAME of www.domain2.ext?

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Server :: Multiple Network Zone - Firewall Routing

Mar 29, 2010

We have a 10.0.0.x network with a working DNS Server (BIND) setup. Recently we purchased Watchguard firewall and configured three networks, so that our internal network can be divided into three networks and talk to each other through firewall routing. So I configured three ips, and for local network card in the firewall router. I separated three networks and individually configured machines with static ip and given gateway as the above ips. Now, I need to configure DNS server for each zone in the same server which is in the network 10.0.0.x, is this possible?. If yes do I need to setup ip aliases for eth0 in the DNS server with different ips from each network?

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Server :: Reversed DNS-lookup Do Not Work On Delegated Zone?

Apr 1, 2010

I'm having this problem that's driving me nuts.Basically I've set up 2 virtual DNS servers.1. Master on fictive domain "domain.xx". 2.ster of fictive domain "sub.domain.xx"NS 1 delegated sub. zone-space to the DNS 2.Everything works except for reverse lookup on sub-domain.For instance. should resolve to my fictive mail.sub.domain.xxIf I try to resolve it with 'host' from domain.xx I get:Host not found: 2(SERVFAIL)If I do the same from the actual sub.domain.xx I get:Host not found: 3(NXDOMAIN).

If I, on the other hand, try to resolve a hostname both from domain.xx or sub.domain.xx with 'host mail.sub.domain.xx' I get the proper address as the answer:'ve delegated the space to sub.domain.xx dns-server according to RFC 2317 specification, at least I think...Please note this is a virtual network address are the excerpts of the in-arpa-files on both domain.xx and the sub.domain.xx server.

$TTL 12h


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Server :: Script For Managing SOA Serial In Zone Files

Feb 25, 2011

Here's a little tool that does this:
Without arguments, updates the SOA serial in a zonefile to the current date. If the date was already updated, just updates the revision number (incrementing up to 99, and then again 01). Uses RFC 1912* recommended format.
With $1 == <two digit number>, auto updates (if necessary) just the date part and uses your provided revision number.
With $1 == <eight digit number>, uses that as a date (no validation of any kind), and just auto update the revision number
With $1 == <full serial>, will just replace whatever the serial is with the provided serial, without any validation

* YYYYMMDDRR (4-digit year, 2-digit month, 2-digit day of month, 2-digit revision number)
This script + keeping SOA/NS/MX/CNAME RRs in a common file $included from other files with $ORIGIN and A/PTR/TXT RRs, made everything way easier to manage, enabling me to script some zone switchers, automatic failover/redirection of DNS on WAN changes, etc, etc. I think this stuff might be cool to integrate with something like this script and make nice CLI toolset for bind. Looking forward to implement it.

Code in pastebin
# globals
script_dir=$(readlink -f "${0%/*}")
script_version=1 .....

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Server :: New Zone Entry In Master Not Getting Updated At Slave

Feb 19, 2011

I have configured master and slave Bind servers. Everything works fine. But whenever I add a new zone entry at master server it is not getting updated at slave server in logs I see this error:
client view external: received notify for zone '': not authoritative

At master server I do not see any error or warning message. This error clearly indicates that named.conf file does not have zone entry in it or domain name is wrong. While checking the named.conf file I see that the zone entry has not been updated at slave server. If I update it manually and reload named on slave then zone files (db files) are getting created without any issue and any modification at master server for the zone records are also getting updated. My concern is why zone record is not getting appended at slave server in named.conf file.

Is there anything I am missing in the configuration. I am pasting the steps which I have followed to configure my master and slave server:
Configure Bind as master and slave server
Install Bind on your server
yum install bind
sudu apt-get install bind9
Generate RNDC Key using the command
rndc-confgen -a -k rndc-key
it will stored in /etc/rndc-key file
Master Server IP
Slave Server IP
Master Server Configuration
options .....

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Fedora Security :: Securing A Server For Deployment In Untrusted Zone?

Apr 1, 2010

I have to deploy a server to some customers that should not be given access to the server itself. I know that nothing is 100% secure but I've searched without finding a decent answer (maybe I googled for the wrong terms ?)I need some advice about encrypted filesystem. * The server must boot without asking for a passphrase (the server will be in a restricted access area so typing a password could take a while). I can't store the password for luks in an unencrypted file so it seems a loop to me. The only way out I can see is to store the passphrase in the boot binaries (better than nothing...) but this results in more work for me.* possibly the customer should not be able to move the hard disks to another pc, i.e. reading the passphrase from some unique hardware ID. This is risky but I could add a master passphrase to be used in case of hardware replacement

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Networking :: IPtables Rules For Master DNS Server To Allow Zone Transfer

Oct 24, 2010

I have set up a master DNS server at and a slave DNS at Both servers are BIND9.Machines are for testing/experimenting, hence the IP addresses. Initially, the zone transfer was blocked by the firewall on the master, as the slave uses randomly selected non-privileged ports for zone-transfer query. So, as far as I understand, there are two possible approaches:

1. Allow connections based on source, which should be
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW,ESTABLISHED -s --sport 1024:65535 --dport 53 -j ACCEPT
(and it works for me fine)

2. Allow ESTABLISHED and RELATED connections, which would be something like
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
which was my initial idea but didn't work, but has inspired me to dig deeper into firewall configuration topics :).

Question: Does zone change notification message count for opening a dialog, or notification from master and slave zone update request are two absolutely separate actions? If the latter is true, that, of course, explains why option #2 didn't work.

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Server :: Ddns Reverse Zone Updates Add Subdomain Twice To Each Entry?

Mar 8, 2011

I've run into a strange issue with a DHCP/DDNS setup whereby when the DHCP server asks the DNS server to add a new host, the forward map is added correctly but the reverse map has the subdomain added twice (e.g.'m running ISC DHCPd version 3.0.1 and BIND version 9.2.3 on SuSE 9.2 - 32bit.Here is my dhcpd.conf file:

# dhcpd.conf
include "/etc/named.keys";


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