guest OS can not connect to local site in vmware but can not connect to internet

view story

http://superuser.com – I connect to internet via VPN connection in our university, First I connect to wireless access point after that I have an access to our university web site I mean I can connect to local web server after that I inter my username and password on VPN connection And finally I have Internet access. I have vmware and my guest OS is Ubuntu I set my connection to Bridge and I congig eth0 to to get ip automatically by its own DHCP, BUT in Ubuntu's firefox I have access just to our university web site and I do not have access to internet. I search On this web site and I saw some solutions for times we (HowTos)