[clug] strange host name

[Jim Watson]

Hi,

I have an ADSL modem that allocates IP numbers by DHCP to machines in  
my LAN including 192.168.0.3
Each machine is told to use my ISP nameservers
nameserver 203.56.186.7
nameserver 192.168.0.1

when i connect from that machine 192.168.0.3  inside my home LAN, it  
is identified (for example when running who on the other machine) as  
www.irun.net.au. which according to whois, belongs to my ISP.

jim-watsons-computer:~ jim$ ping www.irun.net.au
PING www.irun.net.au (192.168.0.3): 56 data bytes
64 bytes from 192.168.0.3: icmp_seq=0 ttl=64 time=0.720 ms

If i ping www.irun.net.au from the host (192.168.0.3) then it pings  
itself, i think?
PING www.irun.net.au (192.168.0.3) 56(84) bytes of data.
64 bytes from 192.168.0.3: icmp_seq=1 ttl=64 time=0.173 ms

external pings take much longer :p

jim-watsons-computer:~ jim$ ping www.netspeed.com.au
PING www.netspeed.com.au (203.221.207.77): 56 data bytes
64 bytes from 203.221.207.77: icmp_seq=0 ttl=125 time=11.429 ms


Is that something wrong in my side, or at the ISP? This is a  
nuisance, but is it a problem too?

thanks

jim