FIB and jail regression [Was: can't reach jails own ipv4 from inside anymore]

[Göran Löwkrantz]

--On December 19, 2012 13:48:34 +0100 Harald Schmalzbauer 
<h.schmalzbauer at omnilan.de> wrote:

>  schrieb Harald Schmalzbauer am 19.12.2012 12:56 (localtime):
>>  ...
>>>
>>> I have more oddities I wanted to check with jails and lagg-interfaces
>>> together with VLANs, but I have no idea why I can't connect from one
>>> jail to it's own IP(v4) anymore!
>> Found out that defining a different FIB causes that behaviour in 9.1.
>> But using a different FIB doesn't caus the same in 8.2!
>
> Easiest way to reproduce:
>
> Just do a ping on the host (not jail)
>
> setfib 0 ping anyLocalIP -> works
> setfib 1 ping anyLocalIP -> doesn't work
>
> Anybody with 9.1 and ROUTINGTABLES in custom kernel out there who can't
> confirm that?
>
> Turned out that 9.0-stable from Feb. 2012 doesn't show that problem.
> So this problem seems to be introdued between 9.0 and 9.1.
> Thanks,
>
> -Harry
>
>
Works for me:
# uname -a
FreeBSD 9.1-PRERELEASE r243951: Fri Dec  7 02:29:14 CET 2012
# sysctl -a | grep fib
net.my_fibnum: 0
net.add_addr_allfibs: 1
net.fibs: 2

# ifconfig sis1
sis1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=83808<VLAN_MTU,WOL_UCAST,WOL_MCAST,WOL_MAGIC,LINKSTATE>
	...
	inet 176.57.193.193 netmask 0xfffffff0 broadcast 176.57.193.207
	....
	media: Ethernet autoselect (100baseTX <full-duplex>)
	status: active

# setfib 0 ping 176.57.193.193
PING 176.57.193.193 (176.57.193.193): 56 data bytes
64 bytes from 176.57.193.193: icmp_seq=0 ttl=64 time=0.497 ms
64 bytes from 176.57.193.193: icmp_seq=1 ttl=64 time=0.481 ms
^C
--- 176.57.193.193 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.481/0.489/0.497/0.008 ms
# setfib 1 ping 176.57.193.193
PING 176.57.193.193 (176.57.193.193): 56 data bytes
64 bytes from 176.57.193.193: icmp_seq=0 ttl=64 time=0.912 ms
64 bytes from 176.57.193.193: icmp_seq=1 ttl=64 time=0.650 ms
^C
--- 176.57.193.193 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.650/0.781/0.912/0.131 ms

I have no kernel with both VIMAGE and ROUTINGTABLES so can test that, this 
has ROUTINGTABLES 2

/glz