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Name Resolution

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by aaintesa

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When i resolve an ip address to a hostname, it is different form when i resolve the host name. e.g

I type ping - 20.63.37.57, it returns lll.co.uk but when i ping ping -a lll.co.uk, it returns a different ip address such as 20.63.37.21.

We have DHCP and DNS servers and i have flushed the DNS cache on the PC. What else can i do to resolve this problem?

Thanks

1 reply

by timwalsh

You don't mention what operating system your servers are running (Win2K w/AD, NT4), nor do you mention whether this particular computer's IP address is fixed or dynamically assigned.

If you are not running an Active Directory (AD) domain then your DNS tables are not dynamically updated with DHCP assigned IP addresses.

IP address to host-name resolution uses a DNS forward lookup zone. Host name to IP address resolution uses a DNS reverse lookup zone. The alternative is to use LMHOSTS files. I suspect that there is a disconnect between the forward and reverse lookup zones for this particular host name. Or there is a disconnect between your forward lookup zone and your LMHOSTS file if you aren't using reverse lookup zones.

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