Routing stops working when we create a new vlan

[Marcelo Gondim]

Hi all,

Let me illustrate a network topology, to tell where the problem occurs:

PC station: 192.168.8.253/24 (FreeBSD 10.2-PRERELEASE)

Router: 192.168.8.177/24 and 10.254.215.1/24 (FreeBSD 10.2-RC2)

router(CPE): 10.254.215.188/24 (a customer)

 From Router:
===========

# ifconfig vlan201
vlan201: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
1500
         options=103<RXCSUM,TXCSUM,TSO4>
         ether 70:71:bc:87:31:2d
         inet 10.254.215.1 netmask 0xffffff00 broadcast 10.254.215.255
         inet6 fe80::7271:bcff:fe87:312d%vlan201 prefixlen 64 scopeid 0x1a
         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
         media: Ethernet autoselect (1000baseT <full-duplex>)
         status: active
         vlan: 201 parent interface: em0

 From PC station (192.168.8.253):
===============================

# ping -c 5 10.254.215.188
PING 10.254.215.188 (10.254.215.188): 56 data bytes
64 bytes from 10.254.215.188: icmp_seq=0 ttl=127 time=1.012 ms
64 bytes from 10.254.215.188: icmp_seq=1 ttl=127 time=0.864 ms
64 bytes from 10.254.215.188: icmp_seq=2 ttl=127 time=1.084 ms
64 bytes from 10.254.215.188: icmp_seq=3 ttl=127 time=1.618 ms
64 bytes from 10.254.215.188: icmp_seq=4 ttl=127 time=1.006 ms

--- 10.254.215.188 ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.864/1.117/1.618/0.261 ms

It works perfectly.

Now I'm going on the router and I just create a new vlan 202.

 From Router:
===========

# ifconfig vlan202 create
#

At that moment my PC station stops to ping the IP 10.254.215.188.

 From PC station (192.168.8.253):
===============================

# ping -c 5 10.254.215.188
PING 10.254.215.188 (10.254.215.188): 56 data bytes

--- 10.254.215.188 ping statistics ---
5 packets transmitted, 0 packets received, 100.0% packet loss

For all work again I need to restart the router.
I don't know if I could correctly explain the problem.

PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202144

[]'s
Gondim