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Problems accessing certain websites using my ISDN router

Right, this is an odd one. I've had an ISDN router for 18 months or so now - a Dynamode 354S. Worked fine until fairly recently.

The problem seems to be that I can't access certain websites when connected via the router - in particularly those in the 60.xxx.xxx.xxx to 80.xxx.xxx.xxx IP address range. If I connect to the same ISP via an analogue modem, I can access the sites without a problem.

At first I assumed it was a DNS problem, but have messed with various options, changed manually defined DNS servers, etc - all to no avail. Any other suggestions?
 
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