do you have MASQERADE out aktive? for the mailserver the traffic seems to come from the internet , remeber that yout FW needs masquerading to be aktive and the gateway of your mailserver needs to be the firewall ASC - Ronald Roeleveld wrote: > Thanks a lot everyone for the emails...I did iptables -t nat --list > and it now gives me this output:DNAT tcp -- > anywhere anywhere tcp dpt:smtp > to:192.168.22.6:25But when I tried to telnet from another machine to > 192.168.22.5 port 25 (the ip of the netfilter firewall/router) it > didn't work at all..Do there has to be a line somewhere that says it's > allowed to forward these connections?Regards,Ronald. > > -----Original Message----- > From: Eugene Joubert [mailto:eugenej@centratel.co.za] > Sent: dinsdag 4 februari 2003 11:41 > To: 'ASC - Ronald Roeleveld'; > Subject: RE: Port forward > > remember that you are using DNAT so you would have to > specify the -t nat switch in your line.eg iptables -t nat -A > PREROUTING -p tcp -s 0/0 --dport 25 -i eth0 -j DNAT --to > 192.168.22.6:25Hope this helps > > -----Original Message----- > From: ASC - Ronald Roeleveld > [mailto:r.roeleveld@ascinternational.nl] > Sent: 04 02 2003 12:31 PM > To: 'netfilter@lists.netfilter.org' > Subject: Port forward > > Hi all,Iam trying to set up a port forward for > several hours now, but I don't seem to get it > working right.When I type the following > command:iptables -A PREROUTING -p tcp > --destination-port 25 -i eth0 -j DNAT > --to-destination 192.168.22.6:25I get this > output:iptables: Invalid argumentI did do iptables > -X PREROUTING so the chain does exist.Can anyone > please help me out..What I want is that all > incoming connections on eth0 on port 25 are routed > to another machine on the internal network > 192.168.22.6Thanks in advance,Ronald Roeleveld > System Administrator > > ASCINTERNATIONAL > Vlietweg 17c, 2266 KA, Leidschendam, The > Netherlands > Tel. +31 (0)70 3178400, Fax +31 (0)70 3204760 > E-mail: r.roeleveld@ascinternational.nl, Website: > http://www.ascinternational.nl > -- ------------------------------------------------------------- Computer Service Büro ENTER Patrick Maartense Tel: +43 2236 42761 am Steinfeld 19a FAX: +43 2236 893970 A-2344 Maria Enzersdorf Mobil: +43 664 4200656 e-mail: office@csbenter.at patrick@patrick.at http://www.csbenter.at -------------------------------------------------------------
