Agreed,
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv4/ip_dynaddr

The second echo would be useful if Cox likes to mess around with your IP 
a lot.  (Not likely, but our fellow phone modem users out there might 
read this and need it for their setups.)

Also, for the 2.4.x kernel using IPTables...
iptables -A POSTROUTING -t nat -s 192.168.0.0/255.255.255.0 -o eth0 -j 
MASQUERADE

technomage wrote, On 11/11/2002 1:45 PM:
> actually,
> if you do it right, you don't need to assign a gateway for eth1. just use an 
> ech statement that allows ipv4_forwarding on.
> 
> thats what I use without truble at all and saves on the gatway line entries
> 
> Technomage
> 
> On Monday 11 November 2002 04:38 am, you wrote:
> 
>>   What distro are you running?
>>
>>   I have cox dhcp and have ipmasq running off a firewall that gives the
>>boxes behind the firewall internet access. I am running RH 7.3
>>
>>   eth0 is set for cox dhcp, eth1 is set for 192.168.0.1, the boxes
>>behind this are set to 192.168.0.x and 192.168.0.x where x is anything
>>from 192.168.0.2 to 192.168.0.254.
>>
>>   The gateway for all machines behind the firewall is 192.168.0.1
>>
>>   The gateway for eth1 is cox dhcp ipaddress, everytime cox changes
>>your ip address, you have to change the gateway for eth1 to the new
>>value.
>>
>>  I have to say that it took me a little time to get this set up running
>>correctly, now that it is, all I have to do to add another pc is
>>configure the new machine and that's it.
>>
>>  Hope this helps --- I'll dig around and look where I got the firewall
>>scripts from, they work just great, and let you know.
>>
>>  FrankM
>>
>>On Sat, 2002-11-09 at 17:28, Unixprgrmr@aol.com wrote:
>>
>>>How do I go from cox dhcp to ip masquerade for fixed ips?
>>>
>>>I already have a system w/2 nic cards....
>>>
>>>Thanks!
>>>Lynn