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. Routing table and ifconfig look the same : 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 5 58 - 8 bge0 224/4 127.0.0.1 URS 0 3918 32768 8 lo0 10.194.116/22 10.194.116.29 UCn 1 59014 - 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 7 - 1 carp0 10.194.116.29 40:a8:f0:36:22:0c UHLl 0 40 - 1 bge0 10.194.119.254 00:1b:2a:e9:c4:00 UHLc 0 29528 - 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 5498 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 again sh /etc/netstart -> everything is working again. Deleting and readding the default route also does the trick. If I test something like : root@fw-t-wan-chut01:~ # sh /etc/netstart root@fw-t-wan-chut01:~ # ifconfig bge0 10.194.116.29/22 The default route disappears. This is a bit weird, but at least the routing table is consistent with what happens. I figured a workaround by not using the mygate file, and adding a line in the hostname.bge0 and hostname.carp0 : !route add default 10.194.119.254 1>/dev/null || route change default 10.194.119.254 1>/dev/null Additional informations : Network configuration : root@fw-t-wan-chut01:~ # cat /etc/hostname.bge0 10.194.116.29/22 description "Admin" up -inet6 root@fw-t-wan-chut01:~ # cat /etc/hostname.carp0 10.194.116.28/22 vhid 15 advskew 10 carpdev bge0 pass xxxx description "TL-INT-ADM-WAN" up -inet6 root@fw-t-wan-chut01:~ # cat /etc/mygate 10.194.119.254 PF is disabled. -- Cordialement, Pierre Bardou