IPFW - Two External Interfaces

[PFS IT]

On 5/16/06, Matthew <drinking.coffee at gmail.com> wrote:
> I recommend you install tcptraceroute:    /usr/ports/net/tcptraceroute/
>
> tcptraceroute will let you specify the interface so you can test your
> configuration.
>
> For example, I have a FWD rule:
> ipfw add 420 fwd 192.168.10.10 tcp  from 84.16.244.0/24 to any
>
> [root at c3p0][~]$ tcptraceroute -s 84.16.244.178 -i gif0 www.google.com
> Selected device gif0, address 84.16.244.178, port 12154 for outgoing packets
> Tracing the path to www.google.com (72.14.203.99) on TCP port 80, 30 hops
> max
>  1  192.168.10.10 (192.168.10.10)  107.013 ms  106.731 ms  106.697 ms
>  2  fragw.gatewayrouter.net (84.16.224.1)  107.287 ms  107.211 ms  107.352
> ms
>  3  fragw1.gatewayrouter.net (217.20.117.10)  106.937 ms  107.240 ms
> 106.986 ms
>  4  rtr-1.decix-germany.eweka.nl (80.81.192.224)  107.090 ms  107.509 ms
> 107.103 ms
>
> -- Matthew
>
>

This really highlights my problem that traffic with a source ip of
192.168.1.1 isn't being forwarded properly to 192.168.1.254. I have
removed all my NAT related rules for testing and have just the
following:

ipfw -f flush
ipfw -f pipe flush

ipfw add fwd 192.168.1.254 tcp from 192.168.1.1 to any

ipfw add allow all from any to any



When I do a tcptraceroute as outlined above:

$sudo tcptraceroute -s 192.168.1.1 -i em0 google.com
Selected device em0, address 192.168.1.1, port 56472 for outgoing packets
Tracing the path to google.com (72.14.207.99) on TCP port 80, 30 hops max
 1  * * *

I get nowhere.

I can get out just fine on bge1, since 192.168.2.254 is my default
gateway on the machine.

I am starting to feel like the fwd directive is simply broken on this
machine... Could there be some kernel options that I'm missing? Are
there any other places I should look for something silly that might be
breaking forward? Again, this did in fact work with pf on this
machine, due to "policy" I need to get it working in ipfw.

Jared Baldridge