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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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 :: Bind Reverse Zone : No Name With Reverse Lookup

Oct 12, 2009

I am using RHEL5. These are my config files:


options {
listen-on port 53 {;; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";


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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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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 :: 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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Ubuntu Servers :: Bind9 Views - Reverse Lookup Zone Doesn't Work ?

Apr 1, 2011

I'm at a loss to why my reverse lookup zone doesn't work for me.I've got two views. One internal and one external. My domain is Public IP:

dig -x @

gives me:

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 2917
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

I've set it up so that the internal subnets gets the domains resolved to the internal IP-addresses. When querying from external addresses I will get public IP.My named.conf.local file:

acl internals {;[code]..........

I don't know whether the views has messed something up. It worked before I added the views.

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Server :: Getting The DDNS Configuration In RHEL 5.2?

May 18, 2011

Friends i got an opertunity to configure ddns in my office.I already configured staic dns in linux, but this is the first time iam configuring ddns.I just configured ddns in rhel 5.2 in my office.So far every thing working fine,dhcp is giving ip address to the clients and both forward and reverse dns database is updating.

1) In windows we can use flushdns and registerdns commands to update the dns database, like this any command is in linux to update client details in dns database?

2)how to restrict multiple client entries keeping in dhcp database.

3)if i change client hostname it is not updating the dns database,it is keeping the old one.

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Server :: BIND - Subdomain Names Not Getting Resolved?

Jun 14, 2011

BackgroundI have registered a domain name "" with domainit. is pointed to our mail server which is running at (fake address).All mails that are being delivered to have no problem getting delivered. We can also send emails out to other domains.I have recently configured BIND 9.3.6 on the same server (running CentOS) that is running our mail server. The purpose is to make sub domain dynamically without getting domainit involved. These subdomains will have incoming and outgoing emails as well. For example, I would want to make a usable subdomain "xyz" under abc and have email address.

I have configured file as follows
$ttl 38400


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Server :: Create Independent Subdomain On Centos?

Sep 26, 2010

creating independent sub-domains on my VPS.To describe this in clear words below is the example:I have a domain named as and k it as test1.demo.comand i have only one IP address assigned to me, which points to how can i set this sub-domain so that I will serve as a separate entity

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Server :: Zimbra - Restrict Mail Sending For Subdomain?

May 4, 2011

I am having trouble configuring Zimbra to restrict sending for some users. A subdomain has been added in the ZCS web page for the domain, resulting in two potential mail addresses:


The subdomain needs to be restricted from sending mail to the outside world and to other users on the same subdomain. It should only be able to message users on the main domain. The users on the main domain should be able to email anyone in the world. Is it possible to configure this without installing Zimbra on two machines?

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CentOS 5 Server :: Ddns Update With Dhcp Don't Work?

Jul 27, 2010

i've installed bind and dhcp. I'd like to update dns automatically by dhcp. For the reverse-lookup-zone everything works fine. But for the forward-lookup-zone there is still the message denied. But i cannot see a mistake.

# DHCP Server Configuration file.


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General :: NETWORKING: Assign Domain To Point To DDNS For Mail Server?

Feb 25, 2010

I was thinking about setting up my own mail server. Problem is my ISP will not let me have a static IP unless I upgrade to a Business class service which is just too expensive for home use. As a work around I use a DDNS service from Dlink, which is actually done via So essentially I have point to my Dynamic WAN IP, and it is all automatically managed by my router.

Is there a way I can haveoint to my mail server without it being a subdomain of my DDNS om)? In other words I would like to have the email and not have it be or something like that. I know someone has done it, I just have never done it. Not quite sure what to google to find the answer myself either.

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Server :: PHP And Sendmail With External Mail Server / Failed Reverse DNS Check?

Jun 7, 2010

After searching the forum I could not find a clear answer to my question so I am giving it a try...

I have installed a LAMP server with Postfix as mail server. The scripts send email as user www-data using the mail server on the same machine.

However, the email got rejected by external mail servers (failed reverse DNS check) so I setup a mail server that meets all needed requirements.

Now I would like to use this second server instead of the mail server on the LAMP server. I found that this could be done with changing sendmail settings in php.ini (I think).

However I am not sure how that will go: www-data is no actual user on the new email server (which requires authentication before sending). Do I need to create a new user on the email server or change the settings in php.ini to match an existing user?

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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 :: 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 :: Bad Entry In Directory Unaligned Directory Entry?

Apr 1, 2011

I have the following error on one of my servers. Is there a way to tell which directory is exactly having the problem? if there is, if i delete that directory, will that resolve the problem or no?kernel: EXT2-fs error (device md(9,0)): ext2_check_page: bad entry in directory #10158084: unaligned directory entry - offset=0, inode=605471640, rec_len=7606, name_len=177

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Server :: Setup Reverse Proxy With Proxy_mod To Port 443 On IIS Server

Aug 30, 2010

We currently have a SUSE Apache2 reverse proxy server setup to reverse proxy (proxy_mod) our GroupWise Web Access server. Our SUSE box is located at Our GroupWise Web Access server is located internally and is called GWMail. We are in the process of migrating from Novell to Windows, so we will have an exchange server with OWA access running on a Windows Server 2008 IIS7 box. That one will be called EXMail internally. Right now when someone goes to it goes to the GWMail internal server from the outside world. This was all set up by previous techs who used Linux more.

We would like to set up reverse proxy to be able to reverse proxy to the Exchange Server from the outside world. Unfortunately the snag we are running into is that Exchange needs to run on port 443, and forwarding to port 443 has been a little tricky. I've read elsewhere we need to implement a generic TCP proxy, such as IPtables. what we need to do to get our SUSU Apache2 server to be able to reverse proxy to our Exchange server on port 443. For the save of argument lets call our SUSE server ExtranetServer. Below is our default-configuration.conf file's configuration:


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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 :: 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 :: 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 :: 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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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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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 :: 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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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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