Unable to connect wired network

view story

http://askubuntu.com – I am using Ubuntu 12.10. My internet connection was working fine. I tried to connect college LAN after changing IP but it didn't work. Then I changed to previous IP and tried with to connect but now it is showing Connection established but there is no internet access. Output of ifconfig is not having wlan and eth1 is showing interrupt17. $ ifconfig eth1 Link encap:Ethernet HWaddr 00:26:22:c8:2d:2a inet addr: Bcast: Mask: inet6 addr: fe80::226:22ff:fec8:2d2a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 M (HowTos)