[openib-general] tcpdump command issue on IB network

[Bob Woodruff]

Roland wrote,

>tcpdump will work fine.  It doesn't look at the hardware address in
>the structure at all.

> - R.

I removed the check and indeed tcpdump does now appear to work in
a modified 2.6.9-34EL kernel. I can add this change to my  
backport-to-2.6.9 patches for 2.6.9-34EL for people that use them. 

[root at iclust-1 woody]# tcpdump -i ib0
tcpdump: WARNING: arptype 32 not supported by libpcap - falling back to
cooked socket
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ib0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes
09:48:39.833316 IP iclust-1-ib0 > iclust-16-ib0: icmp 64: echo request seq 0
09:48:39.833406 IP iclust-16-ib0 > iclust-1-ib0: icmp 64: echo reply seq 0
09:48:40.833356 IP iclust-1-ib0 > iclust-16-ib0: icmp 64: echo request seq 1
09:48:40.833419 IP iclust-16-ib0 > iclust-1-ib0: icmp 64: echo reply seq 1
09:48:44.832002 arp who-has iclust-1-ib0 tell iclust-16-ib0 hardware #32
09:48:44.832023 arp reply iclust-1-ib0 is-at
00:00:04:04:fe:80:00:00:00:00:00:00:00:02:c9:01:0a:d2:58:f1 hardware #32