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Date:   Sat, 12 Dec 2020 10:38:15 +0100
From:   Harald Welte <>
To:     Jonas Bonn <>
Subject: Re: [PATCH net-next v2 01/12] gtp: set initial MTU

On Fri, Dec 11, 2020 at 01:26:01PM +0100, Jonas Bonn wrote:
> The GTP link is brought up with a default MTU of zero.  This can lead to
> some rather unexpected behaviour for users who are more accustomed to
> interfaces coming online with reasonable defaults.
> This patch sets an initial MTU for the GTP link of 1500 less worst-case
> tunnel overhead.

Thanks, LGTM.  I would probably have gone to a #define or a 'const' variable,
but I guess compilers should be smart enough to figure out that this is
static at compile time even the way you wrote it.

Acked-by: Harald Welte <>

- Harald Welte <> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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