[Bug 191975] New: ng_iface regression in 10.0: cannot contact local services

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191975

            Bug ID: 191975
           Summary: ng_iface regression in 10.0: cannot contact local
                    services
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: Normal
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dgilbert at eicat.ca

On a machine connected to the server like:

ng2: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu
1436
        inet 66.96.31.6 --> 66.96.16.50 netmask 0xffffffff
        inet6 fe80::219:b9ff:fef9:b9e7%ng2 prefixlen 64 scopeid 0x8
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

Which also has:

root at owl:/usr/local/etc/mpd5 # ifconfig bge0.401
bge0.401: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=3<RXCSUM,TXCSUM>
        ether 00:19:b9:f9:b9:e7
        inet 66.96.16.3 netmask 0xfffffff0 broadcast 66.96.16.15
        inet6 fe80::219:b9ff:fef9:b9e7%bge0.401 prefixlen 64 scopeid 0x4
        inet6 2001:1928::3 prefixlen 80
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
        vlan: 401 parent interface: bge0
root at owl:/usr/local/etc/mpd5 # ifconfig bge0
bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=8009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LINKSTATE>
        ether 00:19:b9:f9:b9:e7
        inet 172.17.14.2 netmask 0xffffff00 broadcast 172.17.14.255
        inet6 fe80::219:b9ff:fef9:b9e7%bge0 prefixlen 64 scopeid 0x1
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active

The following works:

i[1:49:349]root at strike:/mnt/usr/local/share/asterisk> ping 66.96.31.6
PING 66.96.31.6 (66.96.31.6): 56 data bytes
64 bytes from 66.96.31.6: icmp_seq=0 ttl=64 time=5.939 ms
64 bytes from 66.96.31.6: icmp_seq=1 ttl=64 time=7.179 ms
^C
--- 66.96.31.6 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 5.939/6.559/7.179/0.620 ms
[1:50:350]root at strike:/mnt/usr/local/share/asterisk> ping 66.96.16.3
PING 66.96.16.3 (66.96.16.3): 56 data bytes
64 bytes from 66.96.16.3: icmp_seq=0 ttl=64 time=6.136 ms
64 bytes from 66.96.16.3: icmp_seq=1 ttl=64 time=8.619 ms
^C
--- 66.96.16.3 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 6.136/7.377/8.619/1.242 ms

The following do not:

ssh 66.96.31.6 or 66.96.16.3

or any other service running locally on the machine.

It's worth noting that machines connected to the bge0.401 vlan or the
internet in general can ssh to both addresses.

Environment:
System: FreeBSD yak.eicat.ca 10.0-RELEASE-p6 FreeBSD 10.0-RELEASE-p6 #0
r268353: Mon Jul 7 13:16:17 EDT 2014 root at yak.eicat.ca:/usr/obj/usr/src/sys/YAK
amd64


As above.  Machine is an x3210 Xeon with 4G ram and two BGE class ethernet
interfaces.  Quagga is running.

How-To-Repeat:
I use mpd5 to terinate l2tp tunnels full of pppoe tunnels of subscribers.

Fix:
none known.

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