IPv6 support in the openwrt protocol handler

[Enrico Mioso]

Sorry for the intrusion guys... 
BTW - how do I control modem MTU? Is it sufficient to change bearer's MTU?
In other words - how many different MTUs are there, and how can them be controlled? I am asking this investigating performance issues.
Thank you guys.
Enrico


On Wed, 23 Oct 2019, Bjørn Mork wrote:

> Date: Wed, 23 Oct 2019 10:35:01
> From: Bjørn Mork <bjorn at mork.no>
> To: Aleksander Morgado <aleksander at aleksander.es>
> Cc: "ModemManager (development)" <modemmanager-devel at lists.freedesktop.org>,
>     Nick B <nickberry17 at icloud.com>
> Subject: Re: IPv6 support in the openwrt protocol handler
> 
> Aleksander Morgado <aleksander at aleksander.es> writes:
>
>> Hey Nick,
>>
>> Before the openwrt packages were integrated in the official packages
>> repo, we received a merge request adding some IPv6 support to the
>> modemmanager protocol handler.
>>
>> Please look at this patch in case you want to get that integrated:
>> https://gitlab.freedesktop.org/aleksm/mobile-broadband-openwrt/commit/9234ce19c00cf2067d7ea48844569ae2fd135033
>
> Now I haven't tested this at all, so I might be missing
> something.... But the patch has a
>
> 	if [ "$iptype" = "ipv6" -o "$iptype" = "ipv4v6" ]; then
>           .. lotsofstuff
> 	else
>           .. otherstuff
>        fi
>
> This looks wrong, and like it might potentionally break IPv4 in the
> "ipv4v6" case.  Or is that still handled somehow?
>
> There are also som minor nits like requiring "bearer.ipv6-config.method"
> for IPv6 just for the
>
>  echo "connection setup required in interface ${beareriface}: ${bearermethod}"
>
> when in fact only "static" is supported for IPv6. Which I guess is fine
> by itself. "dhcp" doesn't make much sense. But I believe "ppp" at least
> should spit out an "unsupported" warning or similar.  OpenWrt users have
> been known to try dual stack over PPP in the past :-)
>
>
> Bjørn
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