strange delay while dns resolve

From: Kevin Börgens (kevin_at_boergens.de)
Date: 01/27/05 

Date: Thu, 27 Jan 2005 18:21:19 +0100

Hi

I experience a problem I don't understand - in fact, I have no clue what
could create it.

I have a Debian notebook being connected to a router which is connected to
the german dsl net.

If I ping my router or a ip out in the internet, everything is fine:

-----------8<------------
64 bytes from 64.233.167.99: icmp_seq=15 ttl=244 time=147 ms
64 bytes from 64.233.167.99: icmp_seq=16 ttl=244 time=148 ms
64 bytes from 64.233.167.99: icmp_seq=17 ttl=244 time=148 ms
64 bytes from 64.233.167.99: icmp_seq=18 ttl=244 time=147 ms
64 bytes from 64.233.167.99: icmp_seq=19 ttl=244 time=148 ms
64 bytes from 64.233.167.99: icmp_seq=20 ttl=244 time=148 ms
64 bytes from 64.233.167.99: icmp_seq=21 ttl=244 time=146 ms
64 bytes from 64.233.167.99: icmp_seq=22 ttl=244 time=147 ms

64 bytes from 192.168.0.1: icmp_seq=5 ttl=255 time=1.03 ms
64 bytes from 192.168.0.1: icmp_seq=6 ttl=255 time=0.979 ms
64 bytes from 192.168.0.1: icmp_seq=7 ttl=255 time=0.985 ms
64 bytes from 192.168.0.1: icmp_seq=8 ttl=255 time=0.990 ms
64 bytes from 192.168.0.1: icmp_seq=9 ttl=255 time=1.02 ms
64 bytes from 192.168.0.1: icmp_seq=10 ttl=255 time=0.993 ms
64 bytes from 192.168.0.1: icmp_seq=11 ttl=255 time=0.970 ms
64 bytes from 192.168.0.1: icmp_seq=12 ttl=255 time=0.994 ms
-------------->8--------------

as you can see, I didn't use the dns server but pinged using the ip.
When I ping using the host name instead, something strange happens:
The ping times stay the same but between each ping is a 2 second delay, I
think it is the time where the host name is resolved to its ip.
resolveip <host name> has the same delay

I experience the same delay when I do a "route"

------------------8<-------------
Kernel IP Routentabelle
Ziel Router Genmask Flags Metric Ref Use
Iface
localnet * 255.255.255.0 U 0 0 0 eth0
###2 seconds delay###
default SE515.home 0.0.0.0 UG 0 0 0 eth0
----------------->8---------------------

Its clearly a problem of my machine because the other clients in this net
don't have it but I still have it if I use a friend's net. I don't think
its a hardware problem either, because using wlan it was the same.

Any help appreciated,
     Kevin

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