IPv6 problems after upgrade to r29974 std (06/20/16)

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IsaacFL
DD-WRT Novice


Joined: 12 Jan 2016
Posts: 20
Location: Palm Springs, CA

PostPosted: Thu Jun 23, 2016 4:40    Post subject: IPv6 problems after upgrade to r29974 std (06/20/16) Reply with quote
NetGear WNDR3700
Reset: No
Errors: No
Status: Everything appears ok, but IPv6 errors

upgraded from 29974 - 2016/06/20

when I went to http://test-ipv6.com/
I get the following errors (ipv6 was fine before):

Your Internet Service Provider (ISP) appears to be ROADRUNNER-WEST - Time Warner Cable Internet LLC, US

Our tests show that you may have MTU problems with IPv6; this can cause web sites to load slow (or not at all) when web sites enable IPv6. [more info]

Your DNS server (possibly run by your ISP) appears to have IPv6 Internet access.

Danger! IPv6 sorta works - however, large packets appear to fail, giving the appearance of a broken website. If a publisher publishes to IPv6, you will believe their web site to be broken. Ask your ISP about MTU issues; possibly with your tunnel. Check your firewall to make sure that ICMPv6 messages are allowed (in particular, Type 2 or Packet Too Big). [more info]
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IsaacFL
DD-WRT Novice


Joined: 12 Jan 2016
Posts: 20
Location: Palm Springs, CA

PostPosted: Thu Jun 23, 2016 4:43    Post subject: Reply with quote
When I go to IPV6 tab of setup I see MTU is blank.
Mile-Lile
DD-WRT Guru


Joined: 24 Feb 2013
Posts: 1634
Location: Belgrade

PostPosted: Thu Jun 23, 2016 5:45    Post subject: Reply with quote
Do you use RADVD? There was recently RADVD update...
you can set MTU in custom config...
IsaacFL
DD-WRT Novice


Joined: 12 Jan 2016
Posts: 20
Location: Palm Springs, CA

PostPosted: Thu Jun 23, 2016 13:36    Post subject: Reply with quote
Mile-Lile wrote:
Do you use RADVD? There was recently RADVD update...
you can set MTU in custom config...


I use DNSMasq and have RADVD disabled.

I went back to build 29739 and it is still there.

So it could be something in the way I configured it, or the test has changed to pick up something I didn't see before. The Test Page says the error could be related to the firewall blocking ICMPv6, type 2 (Packet Too Big).

I have never done anything to the firewall settings.
IsaacFL
DD-WRT Novice


Joined: 12 Jan 2016
Posts: 20
Location: Palm Springs, CA

PostPosted: Thu Jun 23, 2016 14:24    Post subject: Reply with quote
IsaacFL wrote:
Mile-Lile wrote:
Do you use RADVD? There was recently RADVD update...
you can set MTU in custom config...


I use DNSMasq and have RADVD disabled.

I went back to build 29739 and it is still there.

So it could be something in the way I configured it, or the test has changed to pick up something I didn't see before. The Test Page says the error could be related to the firewall blocking ICMPv6, type 2 (Packet Too Big).

I have never done anything to the firewall settings.


Today I went to build 29974 (06/20/16)again.

At first it had the same problems, but now it works fine?

Mysterious Mysteries.
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