On Wed, Feb 10, 2010 at 3:16 AM, David Burgess <[email protected]> wrote:
> Greetings,
>
> I have an ADSL modem that is not currently in use, but will be soon.
> When said modem is connected directly by cable to pfsense's WAN, and
> the appropriate address/netmask assigned statically to the WAN
> (192.168.1.0/24), I can reach the modem's web interface at its
> assigned address (192.168.1.1) from a host on the LAN
> (192.168.2.0/24).
>
> However, if I assign the modem a different address (192.168.4.2),
> place the modem on a different interface (192.168.4.1/24), attached
> directly to pfsense by cable again, now I cannot reach it from the
> LAN. On the LAN I have, for the purpose of testing, a rule to permit
> all from all. I have a similar rule on the opt interface that the
> modem is attached to. Both of these rules are set to log.
>
> When I ping the modem from pfsense I get responses. The modem appears
> in the arp table. Yet, for some reason, when I ping from a LAN host, I
> see the ping request show up in the log, but no response is received.
> I did a packet capture on pfsense and I see the icmp request go out,
> but nothing comes back from the modem. Similarly I can't bring up the
> modem's web interface in this configuration.
>
> Any idea what's going on here?

You probably don't have a gateway configured on the OPT interface, so
it's being treated as a LAN/internal interface, and the traffic isn't
being NATed.

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