have you tried disabling the firewall?
Another reason could be the way wvdial (mis)configured /etc/resolv.conf and/or the routing table (viewable thru `route -n`). If you know the IP addresses of your ISP's nameservers (a must have especially because its handy for things like this ;) then you can put those in your /etc/resolv.conf like this:
[EMAIL PROTECTED]:~$ sudo bash
[EMAIL PROTECTED]:~# echo <<EOF > /etc/resolv.conf
nameserver 123.124.125.126
nameserver 123.124.125.127
EOF
[EMAIL PROTECTED]:~# exit
[EMAIL PROTECTED]:~$
I just had that situation right now when I was testing my old Debian installation as a chroot inside my Ubuntu desktop. By fixing /etc/resolv.conf, I'm now chatting thru my favorite IRC client inside a chroot! =)
Cheers,
Zakame
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