Re: New modem and iptables...

Antonio wrote:
I installed a new modem ADSL2+ that doesn' t need pppo any longer
because it starts connection by himself

I had this set of rules on my my computer acting as a router.
When I switched from the old to the new modem, the computer on the lan
didn't surf the net, the I realized that I had to change some rule.

# Generated by iptables-save v1.2.6a on Fri Feb 21 09:27:33 2003
*nat
:OUTPUT ACCEPT [0:0]
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE
# Forward HTTP connections to Squid proxy
-A PREROUTING -p tcp -m tcp -i eth0 --dport 80 -j REDIRECT --to-ports 3128
COMMIT
# Completed on Fri Feb 21 09:27:33 2003
# Generated by iptables-save v1.2.6a on Fri Feb 21 09:27:33 2003
*mangle
:PREROUTING ACCEPT [9:432]
:INPUT ACCEPT [3:234]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [9:684]
:POSTROUTING ACCEPT [17:1292]
COMMIT
# Completed on Fri Feb 21 09:27:33 2003
# Generated by iptables-save v1.2.6a on Fri Feb 21 09:27:33 2003
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth0 -j ACCEPT
-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -i eth0 -j ACCEPT
COMMIT
# Completed on Fri Feb 21 09:27:33 2003


_______________________________________________________
I replaced the postrouting line by:

-A POSTROUTING -s 192.168.0.0/24 -o eth1 -j MASQUERADE

But the LAN didn't work. Where is the mistake???


I expect your "modem" is actually a router, and that you can just turn your Linux firewall off. The router performs firewall and NAT functions that are perfectly adequate for most people.



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Cheers
John

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