Openbsd 5.7: IPv6 autoconf not working

[Alexandre Westfahl]

Hello,

I have a problem with IPv6, I'm not getting "public" IP but router
advertisement/solicitations are being exchanged.

​
​
​My interface has following configuration:
​

# ifconfig em0
em0: flags=208843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,*AUTOCONF6*> mtu
1500
        lladdr 00:0*****86:bc
        priority: 0
        groups: egress
        media: Ethernet 1000baseT (1000baseT full-duplex)
        status: active
        inet 118.********192 netmask 0xffffff80 broadcast 118.*********255

        *inet6* fe80::200:24******86bc%em0 prefixlen 64 scopeid 0x1
​



​and ​
tcpdump gives below output:

tcpdump -vvnli em0 icmp6

05:09:27.184840 fe80::1 > ff02::1: icmp6: router advertisement(chlim=64, MO
router_ltime=1800, reachable_time=0, retrans_time=0)(src lladdr:
fc:48:ef:c3:41:fe)(mtu: mtu=1500) [icmp6 cksum ok] [class 0xc0] (len 32,
hlim 255)
05:10:27.185659 fe80::1 > ff02::1: icmp6: router advertisement(chlim=64, MO
router_ltime=1800, reachable_time=0, retrans_time=0)(src lladdr:
fc:48:ef:c3:41:fe)(mtu: mtu=1500) [icmp6 cksum ok] [class 0xc0] (len 32,
hlim 255)
05:11:21.187692 fe80::1 > ff02::1: icmp6: router advertisement(chlim=64, MO
router_ltime=1800, reachable_time=0, retrans_time=0)(src lladdr:
fc:48:ef:c3:41:fe)(mtu: mtu=1500) [icmp6 cksum ok] [class 0xc0] (len 32,
hlim 255)
05:11:27.186303 fe80::1 > ff02::1: icmp6: router advertisement(chlim=64, MO
router_ltime=1800, reachable_time=0, retrans_time=0)(src lladdr:
fc:48:ef:c3:41:fe)(mtu: mtu=1500) [icmp6 cksum ok] [class 0xc0] (len 32,
hlim 255)
05:10:26.292927 fe80::200:24ff:fed1:86bc > ff02::2: icmp6: router
solicitation (src lladdr: 00:00:24:d1:86:bc) [icmp6 cksum ok] (len 16, hlim
255)
05:11:26.292308 fe80::200:24ff:fed1:86bc > ff02::2: icmp6: router
solicitation (src lladdr: 00:00:24:d1:86:bc) [icmp6 cksum ok] (len 16, hlim
255)

> 05:10:42.962787 fe80::1 > fe80::3a2c:4aff:fe07:b64e: icmp6: neighbor sol:
who has fe80::3a2c:4aff:fe07:b64e(src lladdr: fc:48:ef:c3:41:fe) [icmp6 cksum
ok] [class 0xc0] (len 32, hlim 255)
>
>
​




Thank you very much by advance,
Alex


PS: I already asked on serverfault but no one answered (problem is maybe
rare or version is too new)
http://serverfault.com/questions/711486/openbsd-5-7-ipv6-advertisement-not-wo
rking