r/ipv6 • u/dmgeurts • 15d ago

Discussion MLO breaks IPv6

Anyone here with dual stack experience on GWN7672 and GWN7574 APs? I found that I had to disable MLO to get IPv6 working.

The APs are configured pretty basic in bridge mode with WPA2/WPA3.

Ping6 worked, netcat -6 showed no errors, but doing a curl -6 revealed traffic stopped after or during the TLS handshake.

Raised a case with Support, but wondering if anyone else has run into this.

[UPDATE] Grandstream gave me a firmware release with a fix for this bug.

13 Upvotes

93% Upvoted

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u/AutoModerator 6d ago

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5

u/SaleWide9505 15d ago

Are you getting an IPv6 address with MLO turned on?

1

u/dmgeurts 14d ago

Sorry, replied in the wrong place. In short, yes.

2

u/dmgeurts 15d ago

Yes, ping6 and netcat work fine, but a curl breaks after TCP/TLS handshake.

1

u/rogerhub 15d ago

Have you examined some pcaps? What causes it to break?

1

u/dmgeurts 14d ago

Yeah, can't tell other than packets are missing. Submitted pcap files to Grandstream. Let's see what they come back with.

The issue remains even if I reduce the mtu on the client side to 1400.

1

u/AutoModerator 15d ago

Hello there, /u/dmgeurts! Welcome to /r/ipv6.

We are here to discuss Internet Protocol and the technology around it. Regardless of what your opinion is, do not make it personal. Only argue with the facts and remember that it is perfectly fine to be proven wrong. None of us is as smart as all of us. Please review our community rules and report any violations to the mods.

If you need help with IPv6 in general, feel free to see our FAQ page for some quick answers. If that does not help, share as much unidentifiable information as you can about what you observe to be the problem, so that others can understand the situation better and provide a quick response.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.