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Old 10-20-2016, 05:02 AM   #1
bsystem
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Registered: Oct 2016
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Distribution: Redhat/debian and AIX
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Exclamation forwarding traffic on iptables redhat 6


Hello
I have redhat 6.7 with iptables 1.4.7

Here are the two rules I want to make:

1-forward all incoming traffic by eht0 to eth1 (all protocols)
2-forward all incoming traffic by eth1 to another ip server (all protocols)

Here are the two rules I have defined:

1-iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
2-iptables -t nat -A PREROUTING -p tcp -d x.x.x.x -j DNAT --to y.y.y.y
(x.x.x.x is the ip of eth1)

Only the first pass,and when I put “iptables –S”, it is visible, the other not
The second disappears once the server rebooted.

I checked all these elements

1-CONFIG_IP_NF_TARGET_REDIRECT=m
2-CONFIG_NETFILTER_XT_MATCH_STATE=m
3-net.ipv4.ip_forward = 1

Could you help me
Thanks in advance
 
Old 10-20-2016, 11:25 AM   #2
lazydog
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Registered: Dec 2003
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Distribution: CentOS Sabayon and now Gentoo
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[QUOTE=bsystem;5620469]
Here are the two rules I want to make:

1-forward all incoming traffic by eht0 to eth1 (all protocols)
2-forward all incoming traffic by eth1 to another ip server (all protocols)
[quote]

If you are forwarding everything regardless of port or protocol then all you need is:
Code:
iptables -A FORWARD -j ACCEPT
Quote:
Here are the two rules I have defined:

1-iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
2-iptables -t nat -A PREROUTING -p tcp -d x.x.x.x -j DNAT --to y.y.y.y
(x.x.x.x is the ip of eth1)
Not sure why you need the DNAT rule here could you explain this in more detail like what you are trying to accomplish?

Quote:
Only the first pass,and when I put “iptables –S”, it is visible, the other not
One is a nat filter rule and only shows up when you list the nat rules.

Quote:
The second disappears once the server rebooted.
That is because you need to save your rules before you reboot if you do not have that already setup in iptables-config
 
  


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