Using Linux as a Router

[Waldher, Travis R]

> -----Original Message-----
> From: Rick Stevens [mailto:rstevens at vitalstream.com] 
> Sent: Wednesday, September 22, 2004 10:01 AM
> To: Getting started with Red Hat Linux
> Subject: Re: Using Linux as a Router
> 
> Waldher, Travis R wrote:
> > Anyone got a how to sitting around?
> > 
> > I'de like to use Redhat for my home firewall/router, but can't find 
> > any good info on how to forward IP from one NIC to the other.
> > 
> > I have a machine on the private side NIC(eth1) of the 
> router that can 
> > ping the public NIC(eth0) of the router.  But nothing beyond eth0.
> > :confused:
> 
> You need to set the "ip_forward" flag in the kernel:
> 
> 	echo 1 >/proc/sys/net/ipv4/ip_forward
> 
> To make that permanent, edit /etc/sysctl.conf and look for this line:
> 
> 	net.ipv4.ip_forward = 0
> 
> Change the "0" to "1" and save it.  ip_forward will be set on 
> the next reboot.
> 
> If you're going to do a full-up router, don't forget about 
> your NAT rules in iptables (a.k.a. "Masquerade").  For info 
> on that, see:
> 
> 	http://www.tldp.org/HOWTO/IP-Masquerade-HOWTO/index.html
> 

Thanks, was looking for ip forward everywhere and never wandered my way
across it.

Been having a problem with comcast getting ssslloooowwww from time to
time.  Got them to agree that if a ping to a comcast internal IP addy
showed periods of slowness compared to others.  They would actually come
out and fix everything no cost to me, and no more arguing that it's my
equipment causing the problem. :)