[Bug 194840] New: [carp] Incorrect work of CARP services, started at BACKUP IP

Wed Nov 5 19:06:55 UTC 2014

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194840

            Bug ID: 194840
           Summary: [carp] Incorrect work of CARP services, started at
                    BACKUP IP
           Product: Base System
           Version: 10.1-RC1
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: admin at support.od.ua
                CC: freebsd-net at FreeBSD.org

I have 2 almost identical BGP routers FreeBSD 10.1-PRERELEASE #0: Thu Oct 16
03:58:25 EEST 2014
Both servers are connected with the same switch and have 1 uplink, but default
gateways are different. There is one gateway on the uplink side, IPs are
different, but use VRRP.

[20:19]router1:root->/root# ifconfig em1.201
em1.201: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0
mtu 1500
        options=103<RXCSUM,TXCSUM,TSO4>
        ether 00:25:90:34:cc:af
        inet XXX.XXX.157.1 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid 13
        inet XXX.XXX.157.2 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid 11
        inet XXX.XXX.157.5 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid 12
        inet XXX.XXX.157.129 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid
14
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        vlan: 201 parent interface: em1
        carp: MASTER vhid 13 advbase 1 advskew 50
        carp: BACKUP vhid 11 advbase 1 advskew 150
        carp: BACKUP vhid 12 advbase 1 advskew 100
        carp: BACKUP vhid 14 advbase 1 advskew 100

[20:35]router1:root->/root# netstat -rn |  egrep 'XXX.XXX.157.|Destination'
Destination        Gateway            Flags      Netif Expire
XXX.XXX.157.0/24    link#8             U       em1.201
XXX.XXX.157.1       link#8             UHS         lo0
XXX.XXX.157.3       XXX.XXX.157.191     UGH1    em1.201
XXX.XXX.157.4       XXX.XXX.157.191     UGH1    em1.201
XXX.XXX.157.6       XXX.XXX.157.191     UGH1    em1.201        

[20:36]router1:root->/root# arp -na
? (XXX.XXX.157.35) at (incomplete) on em1.201 expired [vlan]
? (XXX.XXX.157.131) at 00:25:90:18:3d:b8 on em1.201 expires in 1157 seconds
[vlan]
? (XXX.XXX.157.195) at 62:b2:dc:c0:08:96 on em1.201 expires in 624 seconds
[vlan]
? (XXX.XXX.157.2) at 00:00:5e:00:01:0b on em1.201 expires in 1194 seconds
[vlan]
? (XXX.XXX.157.194) at (incomplete) on em1.201 expired [vlan]
...        

[20:18]router2:root->/root#  ifconfig em1.201
em1.201: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0
mtu 1500
        options=103<RXCSUM,TXCSUM,TSO4>
        ether 00:25:90:00:58:fd
        inet XXX.XXX.157.1 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid 13
        inet XXX.XXX.157.2 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid 11
        inet XXX.XXX.157.5 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid 12
        inet XXX.XXX.157.129 netmask 0xffffff00 broadcast XXX.XXX.157.255 vhid
14
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        vlan: 201 parent interface: em1
        carp: BACKUP vhid 13 advbase 1 advskew 100
        carp: MASTER vhid 11 advbase 1 advskew 50
        carp: MASTER vhid 12 advbase 1 advskew 50
        carp: MASTER vhid 14 advbase 1 advskew 50

[20:34]router2:root->/root# arp -na
? (XXX.XXX.157.1) at 00:00:5e:00:01:0d on em1.201 expires in 1195 seconds
[vlan]
? (XXX.XXX.157.196) at bc:5f:f4:1b:d8:91 on em1.201 expires in 1082 seconds
[vlan]
? (XXX.XXX.157.191) at 00:25:90:18:3d:b8 on em1.201 expires in 549 seconds
[vlan]
? (192.168.25.11) at 00:25:90:34:cc:af on em1.199 expires in 25 seconds [vlan]
? (192.168.25.12) at 00:25:90:00:58:fd on em1.199 permanent [vlan]
...

After pinging from remote place XXX.XXX.157.2, I had answer, but, by tcpdump,
answer is coming from em1.201 router1, but not router2!

After pinging from router1 IP XXX.XXX.157.2, answer is coming from em1.201
router2 to em1.201 router1.

ARP cache on server Backup inside the network:

[20:30]backup:root->/root# traceroute -n XXX.XXX.157.2
traceroute to XXX.XXX.157.2 (XXX.XXX.157.2), 64 hops max, 52 byte packets
 1  XXX.XXX.157.2  0.100 ms  0.131 ms  0.146 ms

[20:30]backup:root->/root# arp -na
? (XXX.XXX.157.2) at 00:00:5e:00:01:0b on bge0 expires in 101 seconds
[ethernet]
? (XXX.XXX.157.1) at 00:00:5e:00:01:0d on bge0 expires in 1199 seconds
[ethernet]
? (XXX.XXX.157.196) at bc:5f:f4:1b:d8:91 on bge0 permanent [ethernet]
? (10.0.1.2) at 00:25:90:81:8b:8e on bge0 expires in 105 seconds [ethernet]
? (10.0.1.1) at 00:25:90:18:3d:b9 on bge0 expires in 866 seconds [ethernet]
? (10.0.1.5) at bc:5f:f4:1b:d8:91 on bge0 permanent [ethernet]
...

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