One-way communication with fwip(4) between FreeBSD and MacOS X?

[Eric Anderson]

Arjan van Leeuwen wrote:
> Hi,
> 
> I'm trying to establish an fwip(4) connection between my Powerbook
> running MacOS X 10.4 and my FreeBSD 6.0-RC1 host. I included fwip in
> my kernel and assigned an IP address to the fwip0 interface.
> 
> The weird thing is that it seems to work only one-way. I can ping my
> Powerbook from the FreeBSD machine, I can even ssh to it, etc. But
> from the Powerbook to the FreeBSD host, I get no replies to my pings,
> and I can't access ssh.
> 
> If I do a tcpdump on the FreeBSD machine on fwip0, I can see that the
> ping requests arrive, but there's no answer:
> 
> winston% sudo tcpdump -i fwip0
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on fwip0, link-type APPLE_IP_OVER_IEEE1394 (Apple
> IP-over-IEEE 1394), capture size 96 bytes
> 20:54:32.853931 IP 10.0.0.2 > 10.0.0.1: ICMP echo request, id 20738,
> seq 0, length 64
> 20:54:33.854038 IP 10.0.0.2 > 10.0.0.1: ICMP echo request, id 20738,
> seq 1, length 64
> 20:54:34.854122 IP 10.0.0.2 > 10.0.0.1: ICMP echo request, id 20738,
> seq 2, length 64
> 
> It almost looks like there's a firewall setup to stop any incoming
> traffic on the fwip interface (I have no firewall installed).
> 
> How do I proceed in debugging this?
> 
> Thanks,
> 
> Arjan
> 
> P.S. I'm not subscribed to the firewire@ list, please CC me on reply.

If you run a tcpdump on fxp0 while doing the pings, do you see the 
packets leaving on that interface?

You might send the output of netstat -rn also

Eric




-- 
------------------------------------------------------------------------
Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
------------------------------------------------------------------------