IPv6 not working. Comcast blames the router.

[RogerSC]

(2) So then I created a firewall-start script that looks like this (copied from one of Merlins scripts):

#!/bin/sh
ip6tables -A INPUT -j DROP
ip6tables -I FORWARD 2 -m state --state RELATED,ESTABLISHED -j ACCEPT
ip6tables -A FORWARD -i eth0 -o br0 -p all -j DROP
ip6tables -A FORWARD -i br0 -o any -p all -j ACCEPT
ip6tables -A FORWARD -i br0 -o eth0 -p all -j ACCEPT
ip6tables -A FORWARD -i any -o br0 -p all -j ACCEPT
ip6tables -A FORWARD -j DROP​

When I put these rules in my firewall-start script, I was no longer able to use IPv6...that is, web sites that I was previously using IPv6 to visit (google, yahoo, facebook) reverted to IPv4. So this set of rules apparently effectively blocks IPv6 for me.

Not sure how to debug these rules.

 

[steelman10]

When I put these rules in my firewall-start script, I was no longer able to use IPv6...that is, web sites that I was previously using IPv6 to visit (google, yahoo, facebook) reverted to IPv4. So this set of rules apparently effectively blocks IPv6 for me.

Not sure how to debug these rules.

This command might give you more information: ip6tables -vL (or it might be ip6tables -L -v) I don't have access to my router now.

I will have to test my connection again.

 

[RogerSC]

This command might give you more information: ip6tables -vL

I will have to test my connection again.

Yes, I used the ip6tables -L -v command to see that my new rules were installed. Didn't really help me, other than to list them. I have a Chrome browser extension that displays a 4 if I'm using IPv4 for a particular connection, and a 6 if I'm using IPv6 to connect to the web site. This is how I know that I'm no longer using IPv6, as well as failing the IPv6 test that's online.

 

[steelman10]

Maybe it was a different command but I was able to see stats on how often each rule was applied.

 

[RogerSC]

Well, it's hard for me to tell right now, since I removed the ip6tables statements and IPv6 is still not coming up on my router. So it's hard to tell if it was the new firewall-start script or something else entirely that made my IPv6 stop working.

Update:

Never mind, I didn't give IPv6 enough time to come up. Tried again and gave it more time, like 15 minutes, and IPv6 did come up with the new ip6tables. Sorry for the false alarm.

 

[TheOldMan]

Centurylink 6rd works fine.

Centurylink 6rd works fine with rt-n66u. Just copy exactly what your modem's 6rd settings are on the Centurylink help site. Windows and Linux PCs get ipv6 addresses easy. I have had the router for over 6 months and have gone thru every fw upgrade and use Merlin's 354.29 fw. The only issue I have is the 5ghz wireless setting dropping signal strength the further away you are from the router.