IPv6, Xfinity, and You

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free99
DD-WRT Novice


Joined: 15 Sep 2019
Posts: 4

PostPosted: Wed Nov 06, 2024 21:08    Post subject: IPv6, Xfinity, and You Reply with quote
Hey there,
I've looked over a number of different articles and forum posts here, but am needing some guidance from more experienced folks.

I've managed to get my AC68U up to version r58568 std, most everything is working fine but for the IPv6. I've got IPv6 working fine on the router, ping -6 google.com works.

Nothing seems to work for the clients. I've set DHCP-V6 with PD, /64, MTU is 1500. DHCPv6c (aka DHCPv6 Client Daemon) cannot be disabled, but I have set t to follow "DNSMASQ IPv6 Settings".
I've disabled dhcp6s, radvd, multicast is still checked (blocked) on the firewall page.

On the services tab, I have DNSMASQ's IPv6 RA enabled, br0 ,br4 & br8 checked, where br4 is the bridge/vlan I made for guest devices & br8 is for regular home devices. Stateless DHCP6, default settings otherwise.

Do I need to enable the checkboxes for networks I want the dhcp6 requests to be served on? If I am running wireguard on this, do I also need to check oet1?

I've also tried adding
Code:
server=2620:fe::fe
 dhcp-option=option6:dns-server,[::]
to the custom settings, but no IPv6 DNS entries show up on my Android device. What could be preventing the DHCP6 addresses for devices on my two wifi networks from working? Thank you so much for any help you can provide Very Happy
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Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6968
Location: Romerike, Norway

PostPosted: Thu Nov 07, 2024 5:14    Post subject: Reply with quote
With more than one need a larger PD than /64. Try one between /48 and /60.

Do br0 get an IPv6 address?
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 13445
Location: Netherlands

PostPosted: Thu Nov 07, 2024 7:46    Post subject: Reply with quote
https://github.com/egc112/ddwrt/blob/main/IPv6%20DNSMasq%20IPv6%20RA.pdf
_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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