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Old 13th October 2008
milo974 milo974 is offline
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Question firewall for 2 adsl

hello, actually, we have a firewall with 2 network cards :
Static IP(NET)------Firewall---------lan (switch)
and an other modem router linksys (static ip NET) directly connected on the switch. modem router (cisco) (adsl number 1) (ip address for network card 1firewall) (ip address for network card 2firewall) (lan) modem router linksys (adsl number 2)

we have servers that use adsl 1 and other that use adsl 2.
Our firewall is an Openbsd 4.3-release

is it possible to add a third network card and put on it the second modem router ? how to configure pf and nat ?
or pehaps, the easiest way is to put an other firewall to protect the second adsl line ?
What do you advise me?
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Old 13th October 2008
J65nko J65nko is offline
Join Date: May 2008
Location: Budel - the Netherlands
Posts: 3,776

If the second modem/router is connected to the Lan switch you are not protected by the OBSD firewall at all.

Insert a third NIC on the OBSD firewall and connect the second modem/router to it.

See http://openbsd.org/faq/pf/pools.html#outgoing for a pf ruleset wich will do load balancing between two internet connections.
If some servers use the first ADSL connection and some the second one, the ruleset could be less complicated.

The most secure and recommended solution is to put all the servers in a so-called DMZ. That would require a fourth NIC though
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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Old 13th October 2008
milo974 milo974 is offline
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thank's !
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