BIND do not listen on udp port 53

[Jeff Lightner]

You might want to try "man nmap".  It specifically states -sS is for
checking TCP.  There is a -sU for checking UDP.

 

However simpler than using nmap from within a server is using "lsof" to
check activity on a given port:

lsof -i :53

 

________________________________

From: bind-users-bounces at lists.isc.org
[mailto:bind-users-bounces at lists.isc.org] On Behalf Of Thomas Manson
Sent: Thursday, May 28, 2009 9:28 AM
To: bind-users at lists.isc.org
Subject: BIND do not listen on udp port 53

 

Hi,

 

I'm using BIND 9.5.0-P2 (on ubuntu server 8.04).

 

 And the bind server do not listen anymore on the udp port.

 

I've updated the /etc/bind/named.conf to add a domain, but didn't touch
the /etc/bind/named.conf.options.

 

On localhost, when I use nmap I can see that the udp port is not listed.

 

thomas at ns1:/etc/bind$ sudo nmap -sS localhost

[sudo] password for thomas:

 

Starting Nmap 4.62 ( http://nmap.org ) at 2009-05-28 15:17 CEST

Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.

Interesting ports on localhost (127.0.0.1):

Not shown: 1709 closed ports

PORT     STATE SERVICE

22/tcp   open  ssh

25/tcp   open  smtp

53/tcp   open  domain

80/tcp   open  http

953/tcp  open  rndc

9102/tcp open  jetdirect

 

Nmap done: 1 IP address (1 host up) scanned in 0.175 seconds

thomas at ns1:/etc/bind$

 

 

Does anyone have an idea of what's going on ? 

 

I can't figure out why this stop working as before.

 

Maybe it's trivial, but as it's not my fulltime job to manage these dns
servers (and have so much other thing to deal with), so help would be
appreciated.

 

Regards,

Thomas.
 
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