I'm using OpenBSD 6.4 on a pcengines apu2 box as a router/firewall for a CenturyLink DSL (pppoe) connection.
Today I set up rd6 for ipv6 for the first time, similar to what is described here: https://gist.github.com/afresh1/791343380b4410687d51fdd94f20bd42 Things are working well but one minor issue I notice is when I run "ndp -an" to see ipv6 neighbor info I get an error printed to stderr from ndp: [aaron@apu2] ~$ ndp -an Neighbor Linklayer Address Netif Expire S Flags ndp: ioctl(SIOCGNBRINFO_IN6): Invalid argument ndp: failed to get neighbor information This is followed by normal ndp output lines so this seems like a very minor bug, but is slightly noisy. Below I am pasting: 1. ktrace output for the "ndp -an" command. Looks like ioctl(SIOCGNBRINFO_IN6) is being called on a SOCK_DGRAM socket. ioctl returns -1 with errno 22 Invalid Argument. 2. ifconfig output 1. ktrace output from "ndp -an" command: 9697 ndp CALL socket(AF_INET6,0x2<SOCK_DGRAM>,0) 9697 ndp RET socket 3 9697 ndp CALL sysctl(4.17.0.0.6.0<net.route.0.0.6.0>,0,0x7f7ffffee808,0,0) 9697 ndp RET sysctl 0 9697 ndp CALL sysctl(4.17.0.0.6.0<net.route.0.0.6.0>,0x133e91ee1a00,0x7f7ffffee808,0,0) 9697 ndp RET sysctl 0 9697 ndp CALL kbind(0x7f7ffffee7c8,24,0xd76384b171042686) 9697 ndp RET kbind 0 9697 ndp CALL ioctl(3,SIOCGNBRINFO_IN6,0x133c63e05100) 9697 ndp RET ioctl -1 errno 22 Invalid argument 9697 ndp CALL kbind(0x7f7ffffee7c8,24,0xd76384b171042686) 9697 ndp RET kbind 0 9697 ndp CALL write(2,0x7f7ffffee050,0x5) 9697 ndp GIO fd 2 wrote 5 bytes "ndp: " 9697 ndp RET write 5 9697 ndp CALL write(2,0x7f7ffffee140,0x17) 9697 ndp GIO fd 2 wrote 23 bytes "ioctl(SIOCGNBRINFO_IN6)" 2. ifconfig: [aaron@apu2] ~$ ifconfig lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 32768 index 5 priority 0 llprio 3 groups: lo inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5 inet 127.0.0.1 netmask 0xff000000 em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 lladdr 00:0d:b9:4b:17:10 index 1 priority 0 llprio 3 media: Ethernet autoselect (1000baseT full-duplex) status: active em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 lladdr 00:0d:b9:4b:17:11 index 2 priority 0 llprio 3 media: Ethernet autoselect (1000baseT full-duplex,rxpause,txpause) status: active inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255 inet6 fe80::813b:5c49:d64b:f9fc%em1 prefixlen 64 scopeid 0x2 inet6 2602:d8:a032:2200::1 prefixlen 64 em2: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500 lladdr 00:0d:b9:4b:17:12 index 3 priority 0 llprio 3 media: Ethernet autoselect (none) status: no carrier enc0: flags=0<> index 4 priority 0 llprio 3 groups: enc status: active pppoe0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1492 index 6 priority 0 llprio 3 dev: vlan201 state: session sid: 0x25d PADI retries: 4 PADR retries: 0 time: 04:57:57 sppp: phase network authproto chap groups: pppoe egress status: active inet 216.160.50.34 --> 207.109.2.20 netmask 0xffffffff vlan201: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 lladdr 00:0d:b9:4b:17:10 index 7 priority 0 llprio 3 encap: vnetid 201 parent em0 groups: vlan media: Ethernet autoselect (1000baseT full-duplex) status: active pflog0: flags=141<UP,RUNNING,PROMISC> mtu 33136 index 8 priority 0 llprio 3 groups: pflog gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1472 index 9 priority 0 llprio 3 groups: gif egress tunnel: inet 216.160.50.34 -> 205.171.2.64 ttl 64 nodf inet6 fe80::e39e:d302:d26:902f%gif0 -> prefixlen 64 scopeid 0x9 inet6 2602:d8:a032:2200::1 -> prefixlen 24
