I have a wired problem with VPN

I use vpnclient to connect. After login, I can visit any website
except all with "purdue.edu". I can't ping www.purdue.edu and its IP
address. After disconnect, everything is all right. I'm in campus now
but I want to travel these days. Does anyone have advice or experience
with this?

$ifconfig
cipsec0   Link encap:Ethernet  HWaddr 00:0B:FC:F8:01:8F
          inet addr:172.21.238.102  Mask:255.255.254.0
          inet6 addr: fe80::20b:fcff:fef8:18f/64 Scope:Link
          UP RUNNING NOARP  MTU:1356  Metric:1
          RX packets:267 errors:0 dropped:0 overruns:0 frame:0
          TX packets:175 errors:0 dropped:136 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:31786 (31.0 KiB)  TX bytes:16722 (16.3 KiB)

eth0      Link encap:Ethernet  HWaddr 00:1E:68:A6:07:14
          inet addr:192.168.2.3  Bcast:192.168.2.255  Mask:
255.255.255.0
          inet6 addr: fe80::21e:68ff:fea6:714/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:28174 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21199 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:33101197 (31.5 MiB)  TX bytes:2817864 (2.6 MiB)
          Interrupt:60 Base address:0xc000

$vpnclient connect Purdue
Cisco Systems VPN Client Version 4.8.02 (0030)
Copyright (C) 1998-2007 Cisco Systems, Inc. All Rights Reserved.
Client Type(s): Linux
Running on: Linux 2.6.28.7 #1 SMP PREEMPT Thu Mar 12 18:36:06 EDT 2009
x86_64
Config file directory: /etc/opt/cisco-vpnclient

Initializing the VPN connection.
Contacting the gateway at 128.210.239.31
User Authentication for Purdue...

The server has requested the following information to complete the
user authentication:

Username [hquan]: hquan
Password []:
Authenticating user.
User Authentication for Purdue...

The server has requested the following information to complete the
user authentication:

Username [hquan]: hquan
Password []:
Authenticating user.
Negotiating security policies.
Securing communication channel.

Your VPN connection is secure.

VPN tunnel information.
Client address: 172.21.238.102
Server address: 128.210.239.31
Encryption: 128-bit AES
Authentication: HMAC-SHA
IP Compression: None
NAT passthrough is active on port UDP 4500
Local LAN Access is disabled