From owner-freebsd-net@FreeBSD.ORG  Tue Aug  7 13:53:56 2012
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Date: Tue, 07 Aug 2012 20:53:52 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
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Subject: Send traffic to itself using real NIC
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Hi!

I'd like to run some stability tests for some L2-transparent
gigabit ethernet network hardware I've got.

I have one spare FreeBSD 9.1-PRERELEASE with two-ports igb(4) card
and connected both ports using my L2 hardward making a loop.

Is it possible to configure FreeBSD in such way so it would send
IP traffic for itself not via loopback interface but via igb0/igb1?

I've tried to utilize multiple FIBs:

sysctl net.add_addr_allfibs=0
ifconfig igb0 inet 10.0.0.1/24 mtu 9126
ifconfig igb1 inet 10.0.1.1/24 mtu 9126
setfib 1 route -q flush
setfib 1 route add 10.0.1.1/32 -iface igb1
setfib 2 route -q flush
setfib 2 route add 10.0.0.1/32 -iface igb0

But "setfib 1 ping -S 10.0.0.1 10.0.1.1" still runs via lo0 (and has no answer).

The only way I've got working is unidirectional stream of packets
generated with ng_source(4) (patched due to kern/120304) that shows me 10% packet loss
(using netstat -I to see how many packets got through).

I would really like using normal TCP/UDP/ICMP streams in addition of ng_source tests.

Eugene Grosbein