Clean build of OpenBSD 7.9 generic.mp#449 amd64.
During PPPoE negotiation the peer gives us fe80::1 and we accept it.
So why does pppoe set our link local address to fe80::200:0:0:1 ?
fe80::200:0:0:1 looks like the EUI64 conversion for a MAC address of
00:00:00:00:00:01, so could it be that the offered IFID is being
Interpreted as a MAC?
(1) hostname.pppoe0 (NB: same result if we explicitly set inet6 fe80::1)
inet 0.0.0.0 255.255.255.255 NONE \
pppoedev bge0 authproto chap \
authname ‘xxxxx' authkey ‘xxxxx’ up
dest 0.0.0.1
inet6 eui64
!/sbin/route add default -ifp pppoe0 0.0.0.1
!/sbin/route add -inet6 default -ifp pppoe0 fe80::%pppoe0
(2) Ifconfig pppoe0 after negotiation
pppoe0: flags=8855<UP,DEBUG,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1492
index 5 priority 0 llprio 3
dev: bge0 state: session
sid: 0xca5 PADI retries: 0 PADR retries: 0 time: 00:04:27
sppp: phase network authproto chap authname “xxxxx"
dns: 212.23.3.100 212.23.6.100
groups: pppoe egress
status: active
inet6 fe80::200:0:0:1%pppoe0 --> prefixlen 64 scopeid 0x5
inet 217.155.184.174 --> 51.148.77.132 netmask 0xffffffff
(3) Packet capture on the ethernet (our mac address is 00:9c:02:ab:d9:44)
21:17:19.111881 00:9c:02:ab:d9:44 80:7f:f8:74:01:4b 8864 36: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 16
IPV6CP Configure-Request Id=0x03: IPv6-Interface-Id=029c:02ff:feab:d944
21:17:19.117305 80:7f:f8:74:01:4b 00:9c:02:ab:d9:44 8864 60: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 12
IPCP Configure-Request Id=0x30: IP-Address=51.148.77.133
21:17:19.117307 80:7f:f8:74:01:4b 00:9c:02:ab:d9:44 8864 60: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 24
IPCP Configure-Nak Id=0x02: IP-Address=217.155.184.174
Primary-DNS-Server=212.23.3.100 Secondary-DNS-Server=212.23.6.100
21:17:19.117308 80:7f:f8:74:01:4b 00:9c:02:ab:d9:44 8864 60: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 16
IPV6CP Configure-Request Id=0x62: IPv6-Interface-Id=827f:f8ff:fe74:014b
21:17:19.117779 00:9c:02:ab:d9:44 80:7f:f8:74:01:4b 8864 32: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 12
IPCP Configure-Ack Id=0x30: IP-Address=51.148.77.133
21:17:19.117780 00:9c:02:ab:d9:44 80:7f:f8:74:01:4b 8864 44: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 24
IPCP Configure-Request Id=0x04: IP-Address=217.155.184.174
Primary-DNS-Server=212.23.3.100 Secondary-DNS-Server=212.23.6.100
21:17:19.117781 00:9c:02:ab:d9:44 80:7f:f8:74:01:4b 8864 36: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 16
IPV6CP Configure-Ack Id=0x62: IPv6-Interface-Id=827f:f8ff:fe74:014b
21:17:19.117895 80:7f:f8:74:01:4b 00:9c:02:ab:d9:44 8864 60: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 16
IPV6CP Configure-Nak Id=0x03: IPv6-Interface-Id=0000:0000:0000:0001
21:17:19.118149 00:9c:02:ab:d9:44 80:7f:f8:74:01:4b 8864 36: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 16
IPV6CP Configure-Request Id=0x05: IPv6-Interface-Id=0000:0000:0000:0001
21:17:19.118595 00:9c:02:ab:d9:44 80:7f:f8:74:01:4b 8864 94: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 74
IPv6 fe80::29c:2ff:feab:d944 > ff02::2: HBH icmp6: multicast listener
done max resp delay: 0 addr: ff02::2 [hlim 1]
21:17:19.118597 00:9c:02:ab:d9:44 80:7f:f8:74:01:4b 8864 94: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 74
IPv6 fe80::200:0:0:1 > ff02::1:ff00:1: HBH icmp6: multicast listener
report max resp delay: 0 addr: ff02::1:ff00:1 [hlim 1]
21:17:19.226019 80:7f:f8:74:01:4b 00:9c:02:ab:d9:44 8864 60: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 24
IPCP Configure-Ack Id=0x04: IP-Address=217.155.184.174
Primary-DNS-Server=212.23.3.100 Secondary-DNS-Server=212.23.6.100
21:17:19.226621 80:7f:f8:74:01:4b 00:9c:02:ab:d9:44 8864 60: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 16
IPV6CP Configure-Ack Id=0x05: IPv6-Interface-Id=0000:0000:0000:0001
21:17:19.402414 80:7f:f8:74:01:4b 00:9c:02:ab:d9:44 8864 110: PPPoE-Session
code Session, version 1, type 1, id 0x07e4, length 90
IPv6 fe80::827f:f8ff:fe74:14b > ff02::1: icmp6: router advertisement
[class 0xc0]
