Re: Weird routing problem on simple CARP setup

On Wed, Jun 27, 2018 at 09:30:16AM +0000, BARDOU Pierre wrote:
> Hello,
>
> I have a strange problem with OpenBSD 6.2, which looks like a bug.
> Steps to reproduce :
>
> * sh /etc/netstart -> everything works. Routing table :
> root@fw-t-wan-chut01:~ # netstat -rnf inet
> Routing tables
>
> Internet:
> Destination Gateway Flags Refs Use Mtu Prio Iface
> default 10.194.119.254 UGS 0 16 - 8 bge0
> 224/4 127.0.0.1 URS 0 798 32768 8 lo0
> 10.194.116/22 10.194.116.29 UCn 1 1 - 4 bge0
> 10.194.116/22 10.194.116.28 UCn 0 0 - 19 carp0
> 10.194.116.28 00:00:5e:00:01:0f UHLl 0 3 - 1 carp0
> 10.194.116.29 40:a8:f0:36:22:0c UHLl 0 28 - 1 bge0
> 10.194.119.254 00:1b:2a:e9:c4:00 UHLch 2 5 - 3 bge0
> 10.194.119.255 10.194.116.29 UHb 0 0 - 1 bge0
> 10.194.119.255 10.194.116.28 UHb 0 0 - 1 carp0
> 127/8 127.0.0.1 UGRS 0 0 32768 8 lo0
> 127.0.0.1 127.0.0.1 UHhl 1 1122 32768 1 lo0
> 192.168.190/24 192.168.190.1 Cn 0 0 - 4 bge1
> 192.168.190.1 40:a8:f0:36:22:0d UHLl 0 0 - 1 bge1
> 192.168.190.255 192.168.190.1 Hb 0 0 - 1 bge1
> root@fw-t-wan-chut01:~ # ifconfig carp0
> carp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> lladdr 00:00:5e:00:01:0f
> description: TL-INT-ADM-WAN
> index 10 priority 15 llprio 3
> carp: MASTER carpdev bge0 vhid 15 advbase 1 advskew 10
> groups: carp
> status: master
> inet 10.194.116.28 netmask 0xfffffc00 broadcast 10.194.119.255
>
> * then sh /etc/netstart carp0 -> routed traffic stops working (ping 10.194.125.120 says "sendmsg: Invalid argument").
> Same result if I do ifconfig carp0 10.194.116.28/22.

Have you tried using a /32 mask on carp0 instead of /22?
That might work around the problem.

I believe this problem is fixed in 6.3. Can you confirm?