On 02/01/2008, at 4:11 AM, Robert Moskowitz wrote:
I spent much of the past 24 hours trying to find out how to set up
iptables for firewall routing WITHOUT NATing. Could not find anything.
*boggle* Is it really that hard?
## Clear up whatever is in there at the moment.
iptables -F INPUT
iptables -F FORWARD
iptables -F OUTPUT
iptables -t nat -F POSTROUTING
## Accept anything related to existing connections
iptables -A INPUT -i ppp0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i ppp0 -m state --state RELATED,ESTABLISHED -j
ACCEPT
## I want to allow incoming port 80 to 1.2.3.4
iptables -A FORWARD -i ppp0 -d 1.2.3.4 -p tcp -m state --state NEW -m
tcp --dport 80 -j ACCEPT
## I want to allow incoming port 123 (ntp) to 1.2.3.6
iptables -A FORWARD -i ppp0 -d 1.2.3.6 -p udp -m udp --dport 123 -j
ACCEPT
## Lets block ALL other incoming things
iptables -A INPUT -j DROP
iptables -A FORWARD -j DROP
There you go. That's a very basic firewall using iptables in about 3
minutes :)
--
Steven Haigh
Email: netwiz@xxxxxxxxx
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
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