From owner-freebsd-stable@freebsd.org  Sat Aug 29 21:31:53 2015
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Date: Sat, 29 Aug 2015 23:31:42 +0200
From: "Frank de Bot (lists)" <lists@searchy.net>
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Subject: NFS Client changing it's source address? (FreeBSD 10.2)
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Hello,

I have a server running FreeBSD 10.2. It has several NFS mounts.
Frequently my NFS mount hang (v3). After a little investigation it looks
like FreeBSD has chosen a wrong source address for it's connections and
all packets are departing from the wrong interface.

Sockstat output:

[root@host004 ~]# sockstat -4 | grep 2049
root     ssh        14689 3  tcp4   10.4.2.4:20499        10.4.2.5:22
?        ?          ?     ?  tcp4   10.13.37.4:672        10.13.37.2:2049
?        ?          ?     ?  tcp4   79.x.x.210:905    10.13.37.2:2049
?        ?          ?     ?  tcp4   79.x.x.210:992    10.13.37.2:2049

tcpdump confirms nfs connection are trying to get out via the 79.x.x.x
interface

My fstab for the nfs mounts look like:

10.13.37.2:/tank/hostingbase      /opt/jails/hostingbase       nfs
nfsv3,ro,noatime,async,noauto    0       0

/opt/jails/hostingbase          /opt/jails/test01       nullfs
ro,noatime,noauto      0       0
10.13.37.2:/tank/hosting/test   /opt/jails/test01/opt   nfs
nfsv3,noatime,async,rw,noauto   0       0
tmpfs                           /opt/jails/test01/shm   tmpfs
rw,size=512000000,noauto      0       0

/opt/jails/hostingbase          /opt/jails/test2       nullfs
ro,noatime,noauto      0       0
10.13.37.2:/tank/hosting/test2   /opt/jails/test2/opt   nfs
nfsv3,noatime,async,rw,noauto   0       0
tmpfs                           /opt/jails/test2/shm   tmpfs
rw,size=512000000,noauto      0       0


The change of source address looks to be happening after a nfs
connection  is re-established. At first everything works, I leave the
server idling (it's a test  server) and after that the mounts are hanging

10.2-RELEASE #0 r286666 is the current running version.

Regards,

Frank de Bot