Problem with link aggregation + sshd

Giulio Ferro auryn at
Sat Aug 25 07:54:18 UTC 2012

No answer, so it seems that link aggregation doesn't really work in freebsd,
this may help others with the same problem...

I reverted back to one link for management and one for service, and ssh
works as it should...

On 08/21/2012 11:18 PM, Giulio Ferro wrote:
> Scenario : freebsd 9 stable (yesterday) amd64 on HP server with 4 nic 
> (igb)
> 1 nic is connected standalone to the management switch, the 3 other nics
> are connected to a switch configured for aggregation.
> If I configure the first nic (igb0) there is no problem, I can operate
> as I normally do and sshd functions normally.
> The problems start when I configure the 3 other nics for aggregation:
> in /etc/rc.conf
> ...
> ifconfig_igb1="up"
> ifconfig_igb2="up"
> ifconfig_igb3="up"
> cloned_interfaces=lagg0
> ifconfig_lagg0="laggproto lacp laggport igb1 laggport igb2 laggport 
> igb3"
> ...
> I restart the server and the aggregation seems to work correctly, in
> fact ifconfig returns the correct lagg0 interface with the aggregated
> links, the correct protocol (lacp) and the correct ip address and the
> status is active. I can ping other IPs on the aggregated link.
> Also the other (standalone) link seems to work correctly. I can ping
> that address from other machines, and I can ping other IPs from that
> server.
> DNS lookups work ok too I can also use telnet to connect to pop3
> servers so there seems to be no problem on the network stack.
> But if I try to connect to the sshd service on that server, it hangs
> indefinitely. On the server I find two sshd processes:
> /usr/sbin/sshd
> /usr/sbin/sshd -R
> There is no message in the logs.
> If I try to kill sshd (/etc/rc.d/sshd stop) I can't. it just stays there
> forever waiting for the pid to die (it never does)
> Even ssh client doesn't seem to work. In fact, if I try to connect to
> another server, the ssh client may start to work correctly, then soon
> or later it just hangs there forever, and I can't kill it with ctrl-c.
> No firewall is configured, there is nothing else working on this server.
> Thanks for any suggestions...
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