Problem with link aggregation + sshd

[Damien Fleuriot]

I'll get back to you regarding link aggregation when I'm done with groceries.

We use it here in production and it works flawlessly.



On 25 Aug 2012, at 09:54, Giulio Ferro <auryn at zirakzigil.org> wrote:

> 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 192.168.12.7/24"
>> ...
>> 
>> 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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> 
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