Re: Policy-based routing with ipf

On Thu, 4 Jul 2024, Michael van Elst wrote:
> [email protected] (Stephen Borrill) writes:
>
>>   10.3.0.1 <-> NetBSD <-> 192.168.102.1
>> 10.3.0.254 <-> filter <-> 192.168.102.254
>
>> My plan is to use policy-based routing to direct matched traffic back to
>> 192.168.102.x via 10.3.0.254 (e.g. http or smb). I cannot work out how to
>> achieve this from the man page though.
>
>
> Assuming the following interface names:
>
>             wm0        wm1
>>   10.3.0.1 <-> NetBSD <-> 192.168.102.1
>
> this should be:
>
> pass out quick on wm1 to wm0:10.3.0.254 from 10.3.0.1 to 192.168.102.0/24
>
> pass out quick on wm1               packets sent by wm1
> to wm0:10.3.0.254                   redirect to wm0 with next hop 10.3.0.254
> from 10.3.0.1                       if src is the NetBSD box
> to 192.168.102.0/24                 and dst is on the other net

Thanks Michael, it was the "packets sent by wm1" bit I'd missed. This 
works, I just had to put the rules early on in the ruleset because of 
later rules akin to:

pass out quick on wm1 to 192.168.102.0/24
pass out quick on wm0 to 10.3.0.0.16

I needed to also add a corresponding pass in rule because of later rules

-- 
Stephen