Problem with link aggregation + sshd

[Damien Fleuriot]

In the meantime kindly post:


Ifconfig for your igb0
Netstat -rn
Netstat -aln | grep 22



On 25 Aug 2012, at 13:18, Damien Fleuriot <ml at my.gd> wrote:

> 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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