Internet Connectivity Problem with Cisco 831

[TrooperT]

My network consists of a DSL modem and a Cisco 831 router. My exisint PC
runs XP and can connect to any site on the Internet.

I just downloaded the new Beta2 release of Vista and installed it on a
virgin hard drive. After install I realized that Windows Update would not
run. I set my homepage to Google, which works fine. I get quick search
results, but cannot follow any link to another site. No/few other websites
work at all.

I tried disabling the firewall and access lists on my Cisco 831 router but
nothing I did to the router made any difference. (I am a Cisco CCNP).

I tried turning off the Vista firewall, changed every possible security
setting in IE7, turned off UAC (User Access Control), the works...
I tried a stati IP address with several ISP DNS server entries without
results.

I removed my Cisco router from the mix and connected Vista to my DSL modem
and the problem goes away completely.

***
The Interesting thing here is that when connected to my Cisco router, I only
have one Network Adapter listed in Network Center.
When I connect Vista directly to my DSL mode there are 2 Network Adapters?!?
Both are configured identically, but IPconfig only shows one Ethernet
adapter.
***

Anyone have any ideas?

TrooperT

 

[Guest]

This is a known bug. The TCP/IP stack in Vista has been rewritten, and it now
has problems accessing the internet through routers that have SPI (stateful
packet inspection) protection on them. I'm guessing yours does, as it
displays the exact same symptoms as mine did - can access Google, and one or
two other simple sites (my site www.timspence.co.uk seems to work on mine for
example), but nothing else.

See my thread named "No internet access and SPI router incompatibility"
somewhere down this list for more info.

Basically, it's due to be fixed in the next Beta or Release Candidate.