This is quite easy to do with IPTables ROUTE, I suppose you are using nat anyway you will need to nat to source at first ( at prerouting) then ROUTE to approriate gw basicaly there is no much diference how do you route packets you can just ignore routing at all, and direct everything to default gateway, but receive from anywhere. all you need is to to nat to approriate source at first example: iptables -t nat -A POSTROUTING --dport 110 -j SNAT --to-source 81.x.x.x iptables -t nat-A POSTROUTING ! -d 192.168.0.0/255.255.0.0 -j SNAT --to-source 62.x.x.x this will direct all port 110 trafic to to be received on 81.x.x.x and everything else on 62.x.x.x if you want all port 110 trafic to GO TO 81.x.x.x then use route target iptables -t mangle -A POSTROUTING --dport 110 -j ROUTE --gw 81.x.x.x --continue everything else goes to default gw usualy it is best to se both rules, but they can be used independently you dont need packets to go through the same gateway in both directions. any other very advanced configuartins are possible, I am using similar setup to direct web trafic to one dsl and other trafic to another iptables condition module helps to switch links if one is detected dead. seems iproute is not needed anymore ;-) iptables does routing much better.(but proabbly slower) ----- Original Message ----- From: "Bryan Nolen" <reveng@xxxxxxxxxx> To: <lartc@xxxxxxxxxxxxxxx> Sent: Monday, March 08, 2004 6:11 AM Subject: email/ftp over one connection, all else over second connection Hi all, Just wondering what the easiest way to do the following is: We have two connections (routed ADSL) - a 512k/512k symmetrical and a 1.5M/256k asymmetrical, what I would like is for all email and FTP traffic to use the symmetrical link, and all other internet traffic to use the asymmetrical link. The symmetrical link is already set as the primary MX, so source routing problems aside - how can this be done? Using IPTables ROUTE target? using IPRoute2 (ideally)? The reasons for doing it this way is this company needs a reliable email and ftp channel, but they also do a lot of '"'surfing'"' so I would like the isolate the two distinct traffic types in order to optimise traffic flow. All help is welcome. -Bryan Bryan Nolen Lead Developer, Arc.Net.Au Ph: 03 9499 2929 Fax: 03 9854 5436 Mobile: 0402 022 292 Email: bryan@xxxxxxxxxxxxx or reveng@xxxxxxxxxx http://Arc.Net.AU http://cdonline.com.au _______________________________________________ LARTC mailing list / LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ _______________________________________________ LARTC mailing list / LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
