fib issue with VLAN

[Loïc Blot]

Hello,
i'm trying to implement jails over multiples networks, using VLANs, with different default routes. The network stack is simple

igb0-3 into lagg0
vlan 10-30 over lagg0
jails over VLANs using a fib for each VLAN (but no fib set on the VLAN iface itself)

Whereas it works for a week on my server, after a reboot, the outgoing packets aren't routed to lagg and then outgoing requests doesn't work (like DNS requests), i don't find why.

The fib is correctly set

/etc/rc.local:
setfib 1 route add -net 192.168.136.0/24 -iface vlan136
setfib 1 route add default 192.168.136.254

root at jh1:~ # setfib 1 netstat -rnfinet
Routing tables (fib: 1)

Internet:
Destination        Gateway            Flags      Netif Expire
default            192.168.136.254    UGS     vlan136
192.168.136.0/24   ac:16:2d:96:e5:04  US      vlan136

and the jails are correctly configured:

root at jh1:~ # cat /var/run/jail.idevmysql.conf
# Generated by rc.d/jail at 2015-02-27 10:38:05
devmysql {
    host.hostname = "devmysql.local.net";
    path = "/jails/dev/devmysql";
    ip4.addr += "vlan136|192.168.136.50/32";
    exec.fib = "1";
    allow.raw_sockets = 0;
    exec.clean;
    exec.system_user = "root";
    exec.jail_user = "root";
    exec.start += "/bin/sh /etc/rc";
    exec.stop = "";
    exec.consolelog = "/var/log/jail_idevmysql_console.log";
    mount.fstab = "/etc/fstab.idevmysql";
    mount.devfs;
    mount.fdescfs;
    mount +=  "procfs /jails/dev/idevmysql/proc procfs rw 0 0";
    allow.mount;
    allow.set_hostname = 0;
    allow.sysvipc = 0;
}

Routing is also enabled:

root at jh1:~ # sysctl net.inet.ip.forwarding
net.inet.ip.forwarding: 1

If we are trying to contact the jail from an external host, for example with ansible, the SSH connection works very well but it seems outgoing initiated connections are staying on vlan136 but not forwarded to lagg0.
Have you got any idea ?

Thanks in advance
Regards,

Loïc Blot,
UNIX Systems, Network and Security Engineer
http://www.unix-experience.fr (http://www.unix-experience.fr)