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Date:      Fri, 31 Aug 2001 09:26:33 +0100
From:      "Daniel Fairs" <d.fairs@psychmed.co.uk>
To:        <freebsd-questions@freebsd.org>
Subject:   ARP
Message-ID:  <FBEGIPGMEMLKMAGBBKCKOEMECBAA.d.fairs@psychmed.co.uk>

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Hi,

I'm having a problem setting up a FreeBSD-based firewall. The machine has
three network interfaces:

xl0: Internal interface (192.168.0.1)
xl1: DMZ Interface (d.m.z.ip)
xl2: External Interface (public IP)


Currently, xl1 is not connected, I'm not worrying about it for now.

I've got this machine connected to our ADSL router on xl2, and I can
successfully ping and make connections to the outside world from the
firewall machine. xl0 runs to a hub, and I have another, Linux-based, test
machine on that hub, address 192.168.0.2. Now, from the firewall, I can ping
192.168.0.2. However, from the Linux box, I cannot ping 192.168.0.1, even
when the firewall is disabled with sysctl (just to make sure packets are
getting through!). When I do a tcpdump on the Linux box while running ping,
I see arp request for who has 192.168.0.2 going out - but the firewall is
not responding to them. Do I have to enable arp on xl0? How do I do that? Or
am I missing something else?

TIA,
Dan


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