routing, nat question?

pudhiyavan · 02-01-2005, 10:33 PM

sorry to raise this question,

in linux we can do route and nat, similar way how to internet sharing in windows xp, any opensource tools available?

Thoreau · 02-02-2005, 01:11 AM

Yes, what you call "Internet Connection Sharing" is called dhcpd in linux or any other OS. It's just a dhcp server, not a big deal at all.

pudhiyavan · 02-04-2005, 01:42 AM

thanks thoreau

DavidPhillips · 02-04-2005, 10:15 AM

ICS has two components. A dhcp server and a NAT router.

To get the same thing in linux you need to setup dhcpd. And you also need to setup iptables to do nat and configure your kernel to allow packet forwarding.

dhcpd requires a config file /etc/dhcpd.conf

check this..
http://www.tldp.org/HOWTO/DHCP/index.html
and also..
man dhcpd.conf

Iptables..

http://www.linuxguruz.com/iptables/h...l-HOWTO-1.html
http://www.linuxguruz.com/iptables/howto/

gd2shoe · 02-04-2005, 08:57 PM

I would personally be interested in doing the IP tables manually (not that I have the tallent, lol). Many would not. So your are aware, there are a number of "firewalls" for Linux. Most (if not all) of these work by manipulating the IP tables. At least some of these can be configured to allow packet forwarding. The easy answer might be to get a firewall! (kinda sounds funny doesn't it.)

Thoreau · 02-06-2005, 01:35 PM

As an addendum. Most linux distributions have a button in their control panel that set's up both parts automagically. This has become standard on most major distributions. So, effectively you don't have to know anything at all.