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Top Forums UNIX for Dummies Questions & Answers I need help to set up internet sharing in linux. Post 23049 by Nazo on Saturday 15th of June 2002 11:38:39 PM
Old 06-16-2002
Quote:
Originally posted by PxT
In anutshell you want to do:

# In the NAT table (-t nat), Append a rule (-A) after routing
# (POSTROUTING) for all packets going out eth0 (-o eth0) which says to
# MASQUERADE the connection (-j MASQUERADE).
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

# Turn on IP forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward


Lets call the box running iptables "router". You would set the default gateway on your other machines to point at router. Their DNS could point to an external box, or your internal machine.
(Above examples assumes eth0 is your internet interface).
See http://netfilter.samba.org for lots of docs on how to use iptables.

Setup BIND (ugh...lots of security problems) or djbdns (http://cr.yp.to) on your internal box to do DNS (most likely a caching server which points at the external world).
Thanks. I'll look into that as soon as I get the chance. As for security issues, well, I'm not really too concerned. The pc isn't exactly vital for anything and, besides, it's behind that first PC anyway, but even if someone did attack it it wouldn't do much damage. Even if I have to reinstall, once I get ICS working once, I should be able to remember well enough how to do it again.

Last edited by Nazo; 06-16-2002 at 12:59 AM..
 
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Firewall mark classifier in tc(8)				       Linux					 Firewall mark classifier in tc(8)

NAME
fw - fwmark traffic control filter SYNOPSIS
tc filter ... fw [ classid CLASSID ] [ action ACTION_SPEC ] DESCRIPTION
the fw filter allows to classify packets based on a previously set fwmark by iptables. If it is identical to the filter's handle, the fil- ter matches. iptables allows to mark single packets with the MARK target, or whole connections using CONNMARK. The benefit of using this filter instead of doing the heavy-lifting with tc itself is that on one hand it might be convenient to keep packet filtering and classifi- cation in one place, possibly having to match a packet just once, and on the other users familiar with iptables but not tc will have a less hard time adding QoS to their setups. OPTIONS
classid CLASSID Push matching packets to the class identified by CLASSID. action ACTION_SPEC Apply an action from the generic actions framework on matching packets. EXAMPLES
Take e.g. the following tc filter statement: tc filter add ... handle 6 fw classid 1:1 will match if the packet's fwmark value is 6. This is a sample iptables statement marking packets coming in on eth0: iptables -t mangle -A PREROUTING -i eth0 -j MARK --set-mark 6 SEE ALSO
tc(8), iptables(8), iptables-extensions(8) iproute2 21 Oct 2015 Firewall mark classifier in tc(8)

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