what does:

/sbin/ipchains -A input -j ACCEPT -i eth0 -s 0/0 68 -d 0/0 67 -p udp

mean??

and also,

/sbin/ipchains -P forward DENY


and also,

/sbin/ipchains -A forward -s 192.168.0.0/24 -j MASQ


Thanks for the help.
i am trying to get internet sharing going on red hat 6. Surfing internet is fine now, but it seems a bit slow. And I have no idea why. also, I seems to me that telneting to my linux gateway doesn't work or it's slow. Pinging to the linux machine gives me timed out message.

I think howto will help you a bit http://www.flounder.net/ipchains/ipchains-howto.html
Unfortunatelly, I am no good at networking, but I am learning fast. You are running an obsolete operating system over there, for the life of me I can't even remember what kernel version it came with in a box set. Telneting is not a good option - use SecureShell (ssh, available as a free implementation from http://www.openssh.org ), as for pinging problem, perhaps your firewall is blocking ICMP pings, I suggest to get lokkit firewall it is the simpliest ipchains firewall http://rpmfind.net/linux/rpm2html/se...p?query=lokkit
And my suggestion is to upgrade linux box asap to something more modern (RH 7.2 and up with 2.4.x kernel and iptables firewall)

I am limited to v6 since my hardware is slow as it is. it's a P2 233 with 32MB RAM

But I am puzzled as to why the connection seems slow. I suspect that something is wrong with my configuration. I am able to share the internet in my local area network.

I've shared internet with Win2000 and it's on a P1 200, it works fine.