Which interface do I put natd and ipfw

Lowell Gilbert freebsd-questions-local at be-well.ilk.org
Mon Feb 2 05:40:54 PST 2004

Emmanuel Dwamena <dwamenae at gco.apana.org.au> writes:

> I need help to set up firewall on my freebsd 5.1 box. I have built new kernel 
> with ipfw enabled and is working fine.
> I need to know which of the 3 interfaces do I put the natd and ipfw. 
> My freebsd 5.1 box has 2 nic cards. ed0 connects to LAN and ed1 connects to 
> adsl modem. I use user ppp to setup the connection to the isp who assigns 
> dynamic ip address to the tun0 interface. I have no ip address assigned to 
> ed1. I have traffc coming in through the tun0 from outside  to the LAN. Which 
> of the interfaces do I use to block unwanted traffic from the internet.- ed1 
> or tun0?


>          How do I configure the tun0 interface for the firewall since I do 
> not know the interface address before hand?

You have two choices; either don't use the address in the firewall
setup at all (it isn't really useful...) or use the "me" keyword for
the address (see ipfw(8)).

>                                             Secondly which interface do I 
> place natd? 


Lowell Gilbert, embedded/networking software engineer, Boston area: 
		resume/CV at http://be-well.ilk.org:8088/~lowell/resume/
		username/password "public"

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