Packet loss when connecting via IPv6

[David Woodhouse]

On Thu, 2016-01-28 at 02:02 +0100, Johannes Brechtmann wrote:
> When connecting to a vpn server via IPv6, I get only small packets (I
> guess), so ping works fine, http redirects work but http 200 responses
> get lost. With ssh I can log into a server and use basic commands like
> uptime but e.g. top doesn't work.
> 
> If I connect to the server via IPv4 everything works fine.
> If I connect to the same server with the Cisco AnyConnect client (no
> matter if IPv6 or IPv4), everything works fine, too. 
> 
> I'm using openconnect v7.06 on Debian testing and openconnect for
> android v1.11.
> 
> I'm wondering if this is a problem of openconnect or the server I try
> to connect to.
> 
> Can anyone confirm or deny this behaviour with any vpn server?

What MTU does the AnyConnect client set for the IPv6 link. And what MTU
does OpenConnect set?

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse at intel.com                              Intel Corporation

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