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Comcast Business IPv6 connection not seeing delegated Subnets. What am I missing?

Hello,

I have enabled IPv6 on my UTM and I see a /128 IPv6 assigned to my WAN interface, but I see no reported /56 (or any other) in the IPv6 configuration page. I disconnected the UTM and plugged an ASUS AC1900 in the modem. That device got a /64 for delegation. What am I missing on the UTM? I cannot start assign IPv6 addresses to the other interfaces without finding out the auto-assigned subnets. The IPv6 logs don't report any delegated subnets.

IPv6 Logs keep reporting when I turn on and off IPv6 and the following 4 lines keep getting repeated:

2021:09:27-03:14:44 fw ipv6_watchdog[15916]: Started dhclient6 -N (pid 17358)
2021:09:27-03:14:45 fw ipv6_watchdog[15916]: Gateway changed! Removing default route via fe80::dead:beef:70:1 for interface eth0(ifidx 2)
2021:09:27-03:14:45 fw ipv6_watchdog[15916]: Installing default route via fe80::dead:beef:5:1 for interface eth0(ifidx 2)
2021:09:27-03:14:45 fw ipv6_watchdog[15916]: JSON "eth0", "up", { "gateway6": "fe80::dead:beef:5:1", "network6":"1"}

On the UTM IP Global page:

External (WAN)[Up]
on eth0 [67.170.51.211/21 | 2001:558:600a:7:443c:xxxx:xxxx:xxxx/128]
MTU 1500 · DEFAULT GW 67.x.x.x | fe80::dead:beef:5:1

On the ASUS AC1900

IPv6 Connection Type: Native with DHCP-PD
WAN IPv6 Address: 2001:558:600a:7:6cab:xxxx:xxxx:xxxx
WAN IPv6 Gateway: fe80::dead:beef:4:1
LAN IPv6 Address: 2601:602:8e81:d46:xxxx:xxxx:xxxx:xxxx/64
LAN IPv6 Link-Local Address: fe80::16dd:a9ff:fe8a:d8d0/64
DHCP-PD: Enabled
LAN IPv6 Prefix: 2601:602:8e81:d46::/64
DNS Address: 2001:558:feed::1 2001:558:feed::2

UTM Software Version

Firmware version: 9.707-5

Any direction on this matter would be very appreciated.



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  • The delegated Subnets should be routed behind the /128 IPv6 address.
    I would try to configure this IPv6 Subnet on a UTM interface and tracert to this interface from wan "">www.ipv6tech.ch/ (or place a device within this IPv6 Net and try "tracert 2001:4860:4860::8888" )


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.