DNS lookup in FC2 still slow.

[Nigel Wade]

Ben Vitale wrote:
> Yang Xiao wrote:
> <snip>
> 
>>> again, have you tried to use different DNS servers for queries and
>>> what is performance?
>>> where is the dig output from your current DNS server queries?
>>>
>>> check for contrack use lsmod
>>> iptables -L -n will show you active iptables rule set
>>>
>>> Yang
>>>
>>>   
>>
>> P.S can you send the /etc/nsswitch.conf and /etc/resolv.conf file?
>>
>> Yang
>>
>>
>>  
>>
> /etc/nsswitch.conf and /etc/resolv.conf are attached.
> 
> Query times from the 4 servers in my resolv.conf, starting at the top:
> 
> ;; Query time: 16 msec
> ;; SERVER: 68.48.0.6#53(ns02.rtchrd01.md.comcast.net)
> ;; WHEN: Thu Aug  5 19:32:25 2004
> ;; MSG SIZE  rcvd: 436
> 
> ;; Query time: 25 msec
> ;; SERVER: 68.87.96.16#53(68.87.96.16)
> ;; WHEN: Thu Aug  5 19:34:26 2004
> ;; MSG SIZE  rcvd: 436
> 
> ;; Query time: 18 msec
> ;; SERVER: 68.48.0.12#53(68.48.0.12)
> ;; WHEN: Thu Aug  5 19:34:56 2004
> ;; MSG SIZE  rcvd: 436
> 
> ;; Query time: 25 msec
> ;; SERVER: 68.87.96.15#53(68.87.96.15)
> ;; WHEN: Thu Aug  5 19:35:09 2004
> ;; MSG SIZE  rcvd: 436
> 
> [bvitale at vandelay ~]$ /sbin/lsmod | grep conntrack
> [bvitale at vandelay ~]$
> 
> This makes sense, since I did not setup an iptables firewall.
> 
> Ben
> 
> 

In what way is DNS slow (how does it manifest itself)?

You can install ethereal/ethereal-gnome and capture the DNS lookup 
requests/responses. This should show you the exact time delay between the 
outgoing request and the response.

Are you running nscd? If so, try restarting it, or killing it - it can be a 
real PITA at times.

-- 
Nigel Wade, System Administrator, Space Plasma Physics Group,
             University of Leicester, Leicester, LE1 7RH, UK
E-mail :    nmw at ion.le.ac.uk
Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555