Uno Engborg wrote:
Rüdiger Pretzlaff skrev:
Am 12.07.2008 um 12:21 schrieb Uno Engborg:
For various reasons I would like to forward trafic to port 390 to
port 5432 on the same host. One would think this would be a
simple task for iptables but I have now tinkered with this for two
days, and I still fail to get it right.
I try something like:
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp --dport 390 -j REDIRECT
--to-ports 5432
I have also tried :
iptables -t nat -A PREROUTING -p tcp --dport 390 -j DNAT --to
192.168.0.5:5432
where 192.168.0.5 is the address of the host
Any ideas on how to do this?
Regards
Uno Engborg
Hi,
add:
iptables -A FORWARD -p tcp --dport 390 -d 192.168.0.5 -j ACCEPT
Thanks., but unfortunately that isn't enough to make it work.
Is there any special kernel modules or /proc/sys/ipv4/* settings I need
to do,
or could the problem be that it is the same host?
Regards
Uno Engborg
I don't know how you are applying this so it is hard to say, but you do
not need forwarding.
I would prefer to see you use --to-port ( for single port ) rather then
using --to-ports
Have you seen this:
http://en.wikipedia.org/wiki/Iptables#Redirection_example
If that does not work, maybe include the output from
iptables -t nat --list
and
iptables -n --list --line-numbers
as there may be something else blocking the packets.
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