DNS - 2 hosts pointing to the same IP

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Chad A. Smith - 30 Sep 2003 18:22 GMT

I just discovered 2 pairs of systems on the network are registered to the
same IP address in DNS.

In looking at the forward lookup zones of the DNS server I see:

fzq8z11 points to 192.168.1.41
jzq8z11 points to 192.168.1.41

c840 points to 192.168.1.70
ddd1jb21 points to 192.168.1.70

fzq8z11 and jzq8z11 are Windows 2000 Pro workstations.
c840 and ddd1jb21 are old workstations, no longer a part of the network.

an ipconfig from fzq8z11 returns 192.168.1.70
an ipconfig from jzq8z11 returns 192.168.1.41

a ping of fzq8z11 from fzq8z11 returns 192.168.1.70
a ping of jzq8z11 from fzq8z11 returns 192.168.1.41

a ping of fzq8z11 from jzq8z11 returns 192.168.1.41
a ping of jzq8z11 from jzq8z11 also returns 192.168.1.41

a ping of fzq8z11 and jzq8z11 from all other workstations returns
192.168.1.41

Can anyone tell me how to correct this?
TIA,
Chad

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Mariette Knap [SBS MVP] - 30 Sep 2003 21:56 GMT

> I just discovered 2 pairs of systems on the network are registered to
> the same IP address in DNS.

On the server:

net stop w3proxy
net stop fwsrv
net stop dnscache
net stop dns
net start dns
net start dnscache
net start fwsrv
net start w3proxy
pause

This will flush the DNScache. Reboot the server after this

On the server and each workstation:

ipconfig /flushdns
ipconfig /registerdns

Signature

Mariette Knap
http://wwww.smallbizserver.net

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John Hinckley - 30 Sep 2003 22:21 GMT

At the DNS server: Go to a cmd prompt and type "ipconfig /flushdns". You can also do this at any of the workstations that are resolving incorrectly. When a workstation gets dynamically added to dns is does not automatically flush the old entries from the resolver tables.

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