L2TP Interface shows IPv6 WAN Address

Griffo

Not sure if this is a bug or a "feature". I use an L2TP tunnel, and have an interface assigned to the L2TP. Despite having configured IPv6 on the Interface as Disabled, on the status screens and via an ifconfig, it shows the IPv6 address which is identical to teh WAN DHCP address.

Is this expected?

stephenw10

Not exactly sure what you mean there. Can we see that output?

Griffo

@stephenw10

Sure can

[2.5.0-RC][root@gw.griffo.co]/root: ifconfig
igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: WAN
        options=e120bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCS                                                                                  UM,WOL_MAGIC,VLAN_HWFILTER,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2e
        inet6 fe80::4262:31ff:fe14:862e%igb0 prefixlen 64 scopeid 0x1
        inet6 2403:5800:7001:b:f4f7:9e2e:66f2:31ef prefixlen 128
        inet 159.196.107.74 netmask 0xfffffc00 broadcast 159.196.107.255
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
igb1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: LAN
        options=e120bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCS                                                                                  UM,WOL_MAGIC,VLAN_HWFILTER,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2f
        inet6 fe80::4262:31ff:fe14:862f%igb1 prefixlen 64 scopeid 0x2
        inet6 fe80::1:1%igb1 prefixlen 64 scopeid 0x2
        inet6 2403:5800:7600:b00:4262:31ff:fe14:862f prefixlen 64
        inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb2: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCS                                                                                  UM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:30
        media: Ethernet autoselect
        status: no carrier
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb3: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCS                                                                                  UM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:31
        media: Ethernet autoselect
        status: no carrier
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb4: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCS                                                                                  UM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:32
        media: Ethernet autoselect
        status: no carrier
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb5: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCS                                                                                  UM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:33
        media: Ethernet autoselect
        status: no carrier
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
enc0: flags=0<> metric 0 mtu 1536
        groups: enc
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x8
        inet 127.0.0.1 netmask 0xff000000
        inet 10.10.10.1 netmask 0xffffffff
        groups: lo
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
pflog0: flags=100<PROMISC> metric 0 mtu 33160
        groups: pflog
pfsync0: flags=0<> metric 0 mtu 1500
        groups: pfsync
igb1.20: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: VL_20_US_VPN
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2f
        inet6 fe80::4262:31ff:fe14:862f%igb1.20 prefixlen 64 scopeid 0xb
        inet 192.168.20.1 netmask 0xffffff00 broadcast 192.168.20.255
        groups: vlan
        vlan: 20 vlanpcp: 0 parent interface: igb1
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb1.30: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: VL_30_AU_VPN
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2f
        inet6 fe80::4262:31ff:fe14:862f%igb1.30 prefixlen 64 scopeid 0xc
        inet6 fe80::1:1%igb1.30 prefixlen 64 scopeid 0xc
        inet6 2403:5800:7600:b20:4262:31ff:fe14:862f prefixlen 64
        inet 192.168.30.1 netmask 0xffffff00 broadcast 192.168.30.255
        groups: vlan
        vlan: 30 vlanpcp: 0 parent interface: igb1
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb1.50: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: VL_50_EU_VPN
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2f
        inet6 fe80::4262:31ff:fe14:862f%igb1.50 prefixlen 64 scopeid 0xd
        inet 192.168.50.1 netmask 0xffffff00 broadcast 192.168.50.255
        groups: vlan
        vlan: 50 vlanpcp: 0 parent interface: igb1
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb1.66: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: VL_66_IoT
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2f
        inet6 fe80::4262:31ff:fe14:862f%igb1.66 prefixlen 64 scopeid 0xe
        inet6 fe80::1:1%igb1.66 prefixlen 64 scopeid 0xe
        inet6 2403:5800:7600:b66:4262:31ff:fe14:862f prefixlen 64
        inet 192.168.66.1 netmask 0xffffff00 broadcast 192.168.66.255
        groups: vlan
        vlan: 66 vlanpcp: 0 parent interface: igb1
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb1.99: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: VL_99_Guest
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2f
        inet6 fe80::4262:31ff:fe14:862f%igb1.99 prefixlen 64 scopeid 0xf
        inet 192.168.99.1 netmask 0xffffff00 broadcast 192.168.99.255
        groups: vlan
        vlan: 99 vlanpcp: 0 parent interface: igb1
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
igb1.40: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: VL_40_AU_VPN
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 40:62:31:14:86:2f
        inet6 fe80::4262:31ff:fe14:862f%igb1.40 prefixlen 64 scopeid 0x10
        inet 192.168.40.1 netmask 0xffffff00 broadcast 192.168.40.255
        groups: vlan
        vlan: 40 vlanpcp: 0 parent interface: igb1
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
ovpns5: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
        options=80000<LINKSTATE>
        inet6 fe80::4262:31ff:fe14:862e%ovpns5 prefixlen 64 scopeid 0x13
        inet 192.168.70.1 --> 192.168.70.2 netmask 0xffffffff
        groups: tun openvpn
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        Opened by PID 99838
ovpnc3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
        options=80000<LINKSTATE>
        inet6 fe80::4262:31ff:fe14:862e%ovpnc3 prefixlen 64 scopeid 0x14
        inet 10.8.3.8 --> 10.8.3.1 netmask 0xffffff00
        groups: tun openvpn
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        Opened by PID 8910
ovpnc2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
        options=80000<LINKSTATE>
        inet6 fe80::4262:31ff:fe14:862e%ovpnc2 prefixlen 64 scopeid 0x15
        inet 10.8.1.7 --> 10.8.1.1 netmask 0xffffff00
        groups: tun openvpn
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        Opened by PID 18229
wg0: flags=8080c1<UP,RUNNING,NOARP,MULTICAST> metric 0 mtu 1420
        options=880000<LINKSTATE>
        inet 10.70.216.246 netmask 0xffffffff
        inet6 fe80::4262:31ff:fe14:862e%wg0 prefixlen 64 scopeid 0x12
        groups: wg
        listen-port: 51820
        private-key: GFeaYI8bYOFrCfk/N/r1GAa+/vZOC0u8PIEqaHKx/nk=
        public-key:  yBrQjNLbMEl0WCF4cdehnZ6+H8RY4rFTeJRphikmbGQ=
        media: Ethernet autoselect (25GBase-ACC <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
wg1: flags=8080c1<UP,RUNNING,NOARP,MULTICAST> metric 0 mtu 1420
        options=880000<LINKSTATE>
        inet 192.168.70.65 netmask 0xffffffc0
        inet6 fe80::4262:31ff:fe14:862e%wg1 prefixlen 64 scopeid 0x16
        groups: wg
        listen-port: 51821
        private-key: qIJxtOGI7RU635vzMLqn31gF9i2sEa975+acIpkvPG0=
        public-key:  6iEV/lkOxZTe7naSF3LvLl+M9KfMDqdFYqhzmvoD1io=
        media: Ethernet autoselect (25GBase-ACC <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
wg2: flags=8080c1<UP,RUNNING,NOARP,MULTICAST> metric 0 mtu 1420
        options=880000<LINKSTATE>
        inet 10.68.2.28 netmask 0xffffffff
        inet6 fe80::4262:31ff:fe14:862e%wg2 prefixlen 64 scopeid 0x11
        groups: wg
        listen-port: 51822
        private-key: gA/AQzkQtUJvRQeo8xxROQ77JMEHNp3RgF0kbejfR1g=
        public-key:  tVD80+9oTjefKZxWsY0+ulZv0/vWYH8qjUenuc1Ma1I=
        media: Ethernet autoselect (25GBase-ACC <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>.
l2tp0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu 1492
        description: VPN_Trimium_L2TP
        inet 192.168.88.94 --> 192.168.88.1 netmask 0xffffffff
        inet6 fe80::4262:31ff:fe14:862e%l2tp0 prefixlen 64 scopeid 0x17
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
[2.5.0-RC][root@gw.griffo.co]/root:

even in down state

stephenw10

Oh I see it's an L2TP client?
I assume the server is not passing IPv6 to it? Not sure I've ever considered if that's possible to be honest.

Mmm, that is probably an edge case that slipped though. L2TP clients are not at all common.
I would open a bug report for that: https://redmine.pfsense.org/
I don't see anything there that looks like that already.

Steve

Griffo

@stephenw10 Thanks. I actually don't want any IPv6 on this interface, but it seems to get one anyway. I'll raise a bug. There's actually a bunch of small bugs with L2TP clients so I might get busy raising them all.

stephenw10

Yes, I'd go ahead and do that. That interface type is probably the least well used. Or maybe pptp!

It's likely a display bug only. You can see the actual interface does not have an IPv6 address.

Steve