Thanks, I'll check it out and let you know. With best regards.Mojtaba On Fri, Apr 26, 2019 at 3:15 AM Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote: > > On Thu, Apr 25, 2019 at 07:38:20PM +0430, Mojtaba wrote: > > Hello all > > I read man conntrack document guide. That is great. > > I have a issue while i am working on it. For example i just want to insert > > new rule in conntrack table like this: > > conntrack -I -p udp -s 192.168.122.242 -d 192.168.122.103 --sport 5070 > > --dport 5005 -r 192.168.122.1 -q 192.168.122.103 --reply-port-src 1111 > > --reply-port-dst 2222 --timeout 30 > > > > it successfully inserted but doesn’t work and traffic will be go to INPUT chain. > > if i insert these two rules in iptables, the same above rules will be inserted > > in conntrack table automatically and works correctly.(the traffic will > > be traversed to 192.168.122.1 host) > > iptables -t nat -A PREROUTING -i eth0 -p udp -s 192.168.122.242 > > --dport 5005 -j DNAT --to 192.168.122.1:1111 > > > > iptables -t nat -A POSTROUTING -p udp --dport 1111 -j SNAT --to > > 192.168.122.103:2222 > > Have a look at --dst-nat option, eg. > > conntrack -I -p udp -s 192.168.122.242 -d 192.168.122.103 --sport 5070 --dport 5005 --dst-nat 192.168.122.1 --timeout 30 -- --Mojtaba Esfandiari.S
