check if u have a vpn connection u might be getting a different ip when u log in for ppp0 something that does not start with 172.something or 192.something or 10.something. so ur default gateway after connection doesnot remain 172.something. in such a case change ur default gateway to "0.0.0.0" or "*.*.*.*" so that your default gateway is taken automatically. rh won't let u change this bu using setup so u have to edit /etc/sysconfig/network-scripts/ifcfg-eth0 and add a line GATEWAY 0.0.0.0.
u can see ur gateway by giving the route command after this and it shoulnot begin with either 172,192 or 10
===== ninad purohit ninadonline(at)yahoo(dot)co(dot)in have a nice day :-)
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