virtualbox.org

Hi,
I running a host Debian Lenny with ips:
10.10.12.10
10.10.12.11
...

I set Up a win2003 Gust with bridged network card ip:
10.10.12.11

Internet works fine now with the guest pc but the host ip: 10.10.12.10 is not accessable with the guest pc.

Where is the problem?

Does you Host have both .10 and .11? If so, you're having an IP conflict, because the Guest also has .11.