[clug] strange host name

Kim Holburn kim at holburn.net
Fri Oct 20 10:23:18 GMT 2006

On 2006 Oct 20, at 6:29 PM, Jim Watson wrote:
> I have an ADSL modem that allocates IP numbers by DHCP to machines  
> in my LAN including
> Each machine is told to use my ISP nameservers
> nameserver
> nameserver
> when i connect from that machine  inside my home LAN,

To what?  To a machine outside your ISP?

> 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.

Actually when I look up the host (I am not using netspeed):
$ host www.irun.net.au
www.irun.net.au has address
$ host -t ns irun.net.au
irun.net.au name server ns2.netspeed.com.au.
irun.net.au name server ns1.netspeed.com.au.
$ host ns2.netspeed.com.au
ns2.netspeed.com.au has address

OK irun is owned by netspeed.

This means it is advertising www.irun.net.au as having that address  
which I don't believe is correct.

My memory of netspeed is that they occasionally scramble their DNS.   
Give them a support call.

Try going to an IP site like one listed at myip.com.
for instance :


This won't necessarily give you your IP.  You need an https site for  
that because your ISP may have a transparent proxy and with http you  
are only seeing the IP address of the proxy.

This is the only one of those sites that seems to do https

> jim-watsons-computer:~ jim$ ping www.irun.net.au
> PING www.irun.net.au ( 56 data bytes
> 64 bytes from icmp_seq=0 ttl=64 time=0.720 ms
> If i ping www.irun.net.au from the host ( then it pings  
> itself, i think?
> PING www.irun.net.au ( 56(84) bytes of data.
> 64 bytes from 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 ( 56 data bytes
> 64 bytes from 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
> -- 
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> linux at lists.samba.org
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Kim Holburn
IT Network & Security Consultant
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