On 2015-10-21 12:30, Daniel Wagner wrote:
> On 10/21/2015 12:25 PM, Patrik Flykt wrote:
>> On Wed, 2015-10-21 at 12:12 +0200, Daniel Wagner wrote:
>>> The use of the different MTU options depend on you server and link
>>> configuration. I don't think you can derive it. OpenVPN seems to offer
>>> an option to learn the MTU size by doing some measurements but that
>>> takes around 3 minutes according documentation. I recommend to just
>>> expose those options and let the user decide what he needs.
>> Well, now the problem is that I have no idea what to add as MTU values
>> if I need to... Sven's "documented" problem and solution was to use
>> --tun-mtu, if that is the max sized packet that can go through
>> unfragmented it looks like the only option one should specify. And
>> --fragment seems to be needed always in addition to any of the MTUs?
>> Unless it's the default behavior?
> I don't know if there is a sane MTU configuration setting for OpenVPN. I
> reread the documentation several times and it seems you need to pick the
> options according your configuration.

Yeah. Those values are left alone for the large majority of deployments
and I've only seen them used to deal with wonky carriers in WWAN

Personally, I'd be fine with using the OpenVPN.ConfigFile parameter for
the few cases I end up needing it. (And I'm not even sure whether we're
going to migrate to connman.)

Mit freundlichen Grüßen, / Best Regards,
Sven Schwedas
TAO Beratungs- und Management GmbH | Lendplatz 45 | A - 8020 Graz
Mail/XMPP: sven.schwe...@tao.at | +43 (0)680 301 7167

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