Hi, thanks for all your replies, etc. But my problem is not yet solved. I dont know why?! Can someone give me how did they did it? -- thanks, louie miranda ----- Original Message ----- From: "Jozsef Kadlecsik" <kadlec@blackhole.kfki.hu> To: "Raymond Leach" <raymondl@knowledgefactory.co.za> Cc: <rsterenborg@xs4all.nl>; "'Paulo Andre'" <pandre@darkstar.nom.za>; "'louie miranda'" <lmiranda@chikka.com>; "'netfilter'" <netfilter@lists.netfilter.org> Sent: Tuesday, December 10, 2002 7:22 PM Subject: RE: portfw on iptables 2.4 kernel problem. > On 10 Dec 2002, Raymond Leach wrote: > > > Yes, you do. Port 20 (and/or any other) connections after the control > > connection are not 'RELATED, ESTABLISHED' to the control connection. > > They are new connections either from the client to the server or vice > > versa. You therefore need seperate rules for them. > > If we are speaking about the data channels of the supported protocols > (FTP, IRC and all the other protocols from p-o-m), then this is absolutely > false. > > > Remember connection tracking happens at a pakcet level, i.e all states > > relate to packets of a connection, not per protocol. > > In the case of the supported protocols with additional channels, again, > untrue. Please do no spread false info! Why would then the RELATED state > exist? > > > > However, I'm not sure if it's better to split them up into 2 rules : > > > iptables -A FORWARD -i eth0 -o eth1 -p tcp --dport 21 -m state --state > > > NEW -j ACCEPT > > > iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED > > > -j ACCEPT > > Because the destination port of the data channels cannot be port 21, > therefore you must use two rules. And because you specify the > incoming/outgoing interfaces, you need a third rule for the reply packets > as well. > > Regards, > Jozsef > - > E-mail : kadlec@blackhole.kfki.hu, kadlec@sunserv.kfki.hu > PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt > Address : KFKI Research Institute for Particle and Nuclear Physics > H-1525 Budapest 114, POB. 49, Hungary > > >
