[clug] strange network behaviour

[nic]

Hi,

I am unable to access the site www.ibiblio.org from my home network. 
Initially I thought that the site was down but soon realised that I 
could access the site from my firewall but not from the other computers 
on the network (linux or windows 2k) where firefox tells me that the 
site cannot not be found. This has never occurred with any other site 
that I know of, although it may have happened with "small" sites and I 
have interpreted this as the site no longer being online..

I thought that the problem was related to name resolution so I entered 
the ip address in the client's browsers and was able to access the home 
page. I have the feeling that the dns lookup times out but I do not know 
what to do next...

My firewall runs firestarter on Fedora 3 and is very simply setup with 
most ports blocked by default.

Any ideas on where to start?

Thanks

Nic