[plug] Which is the best option to dial up to ISP with Redhat 7.1 as a server to allow LAN access?

[Craig Ringer]

I reccomend that you also set up a caching nameserver on the firewall, and 
instruct clients to use it rather than the ISPs nameserver. Helps a lot on a 
slow link, esp. if you never turn off the firewall.

If you're feeling really crazy, you can set up transparent web proxying and 
dns proxying using iptables - but you can always play with that after the 
rest is set up.