Posted: Sun Apr 03, 2022 1:14 Post subject: IPv6 Setup for Comcast on WRT3200ACM
I'm trying to get IPv6 set up on my router. A while back I had it working, but I think Comcast changed something on their end, and I haven't been able to configure my router properly for IPv6 since. I've tried different builds, clearing the nvram, and every configuration I could find scouring this forum, google, etc.
With my current configuration, dd-wrt is showing an IPv6 address in the top right corner of the GUI, my client devices are getting IPv6 addresses, and I can ping6 other clients on the LAN, but test-ipv6 is failing. Here's some info about my configuration: please let me know if you need more info to help.
Modem: Comcast modem/router combo in bridge mode (With bridge mode off, I am able to get a working IPv6 connection through the Xfinity router)
Operating Mode: Gateway
Connection Type: Auto Config - DHCP
Ignore WAN DNS: disabled
Use VLAN Priority: disabled
Gateway, Local DNS, and Static DNSs are all left at 0.0.0.0
DHCP Type: Server
Use DNSMasq for DNS: Enabled
Recursive DNS Resolving (Unbound): Disabled
Forced DNS Redirection: Disabled
Type: DHCPv6 with Prefix Delegation
Prefix Length: 64
Static DNS 1,2: Left Blank
No release on reconnect: Disabled
Dhcp6c custom: Disabled
Sequential IPs: Disabled
Dhcp6s custom: Disabled
Radvd custom: Disabled
Used Domain: LAN and WLAN
Encrypt DNS: Disabled
Cache DNSSEC data: Enabled
Validate DNS Replies (DNSSEC): Enabled
Check unsigned DNS replies: Enabled
No DNS Rebind: Enabled
Query DNS in Strict Order: Disabled
Add Requestor MAC to DNS Query: Enabled
RFC4039 Rapid Commit support: Disabled
Try a traceroute6 2620:fe::9 and see where it stops.
If you run Windows the command is "tracert"
Yes, it does.
Ran traceroute: It stops at the IPv6 address that's assigned to my router. I'm guessing that means my LAN is setup as IPv6, but that doesn't match what's being issued by Comcast? No clue how to fix that lol.
(Also, for anyone who is following along in the future, the command in terminal is traceroute6 if you're on a Mac.)