F5F Stay Refreshed Power Users Networks Do you need help setting up IPv6 on your computer when using a Comcast internet connection?

Do you need help setting up IPv6 on your computer when using a Comcast internet connection?

Do you need help setting up IPv6 on your computer when using a Comcast internet connection?

J
Jameszaa333
Member
50
06-27-2026, 11:59 PM
#1
I need help with IPv6 on OPNsense for Comcast. My router is set up so that DHCPv6 works over my WAN connection and assigns an address. The LAN side uses a "track interface" method, which means the router watches the WAN to find its own address. This setup shows two types of addresses: one link-local (a type used only on local networks) and a regular IPv6 internet address. My Windows computers can connect to each other fine using IPv6, but I cannot reach websites that use IPv6. When I try to ping Google.com from my router, it works. However, when I send an IPv6 packet from my home PC to another PC in the same house, they get a connection, yet I still don't have internet access on my own machines. The problem is just that my computers can only get internet via regular IPv4, not IPv6. Any thoughts? Update: Changing "router advertisements [LAN]" to "Assisted" fixed the issue. Leaving this setting here if it helps someone else later.
J
Jameszaa333
06-27-2026, 11:59 PM #1

I need help with IPv6 on OPNsense for Comcast. My router is set up so that DHCPv6 works over my WAN connection and assigns an address. The LAN side uses a "track interface" method, which means the router watches the WAN to find its own address. This setup shows two types of addresses: one link-local (a type used only on local networks) and a regular IPv6 internet address. My Windows computers can connect to each other fine using IPv6, but I cannot reach websites that use IPv6. When I try to ping Google.com from my router, it works. However, when I send an IPv6 packet from my home PC to another PC in the same house, they get a connection, yet I still don't have internet access on my own machines. The problem is just that my computers can only get internet via regular IPv4, not IPv6. Any thoughts? Update: Changing "router advertisements [LAN]" to "Assisted" fixed the issue. Leaving this setting here if it helps someone else later.

B
baud2001
Junior Member
11
06-28-2026, 01:38 AM
#2
You know that I actually forgot how to set up a router for IPv6. My ISP used to give me a small group of IPv6 addresses, but now there seems to be this kind of IPv6 NAT sometimes. I have always just turned off IPv6 and told most people to turn it off because many people see random performance problems with all that stuff. Is there any reason you would need to use IPv6?
B
baud2001
06-28-2026, 01:38 AM #2

You know that I actually forgot how to set up a router for IPv6. My ISP used to give me a small group of IPv6 addresses, but now there seems to be this kind of IPv6 NAT sometimes. I have always just turned off IPv6 and told most people to turn it off because many people see random performance problems with all that stuff. Is there any reason you would need to use IPv6?

T
ThereWas
Member
137
06-29-2026, 03:35 PM
#3
I don't think most websites work well over ipv6 right now. One good reason is for setting up private services like a site-to-site vpn. This helps if you have a static ipv6 address but no ipv4, and want to use ipv6 to translate your traffic into ipv4.
T
ThereWas
06-29-2026, 03:35 PM #3

I don't think most websites work well over ipv6 right now. One good reason is for setting up private services like a site-to-site vpn. This helps if you have a static ipv6 address but no ipv4, and want to use ipv6 to translate your traffic into ipv4.