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Old 22nd February 2008, 10:50 AM
mattywix Offline
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Join Date: Dec 2007
Posts: 110
/etc/sysconfig/iptables how to set -t nat -A POSTROUTING ?

How can I add the following in /etc/sysconfig/iptables ? The format of the file doesnt seem to allow this...
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo "1"> /proc/sys/net/ipv4/ip_forward

"For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return." - Leonardo da Vinci speaks of his joy at experiencing Linux
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Old 23rd February 2008, 03:11 AM
nucleo Offline
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Join Date: Jan 2008
Posts: 101
service iptables save
saves the output of iptables-save to /etc/sysconfig/iptables
net.ipv4.ip_forward = 1
in the file /etc/sysctl.conf enables forwarding
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Old 20th April 2012, 10:02 AM
joseCuervo Offline
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Join Date: Apr 2012
Location: Seoul, Korea
Posts: 1
Re: /etc/sysconfig/iptables how to set -t nat -A POSTROUTING ?

My laptop is on the LAN (with address of and it can ping but it cannot ping www.google.com
I want to use p1p1 (a.k.a. eth1) as and route everything from through eth0 to access internet but cannot figure out how to add simple NAT commands to iptables script ...


on Fedora release 16 (Verne)................ there is no "service iptables save" command (the original post is old from 2008)

[root@ezcorean sysconfig]# service iptables save
Redirecting to /bin/systemctl  save iptables.service
Unknown operation save
[root@ezcorean sysconfig]#
I have enabled

# Controls IP packet forwarding
net.ipv4.ip_forward = 1
in /etc/sysctl.conf

however, I still do not know how to add the rule
to /etc/sysconfig/iptables

If I do so, /var/log/messages says:

"Line 13 seems to have a -t table option." and it fails to start iptables.

However, if I run
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
I can access the internet from my laptop as described above.

I suppose I should just add
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
to /etc/rc.local ??

Last edited by joseCuervo; 20th April 2012 at 10:26 AM.
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nat, postrouting, set

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