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Could you try setting MTU lesser value say 1200 on instance interface and
re-try?.
Ideally your physical server connecting to  switch port must have
configured with atleast 1600 MTU in order for VXLAN traffic to work
seamlessly.

Thanks,
Prashant

On Thu, Jan 5, 2017 at 9:30 PM, Mārtiņš Jakubovičs <martins-lists at hostnet.lv
> wrote:

> Hello all,
>
> I have problem to setup PPTP VPN behind floating IP's in instances which
> have VXLAN network. Maybe someone had same issue and can recommend
> something? In security groups I allowed protocol's 47 traffic and VPN
> client can connect but it can't establish connection, I consider, maybe
> issue are with MTU, so VXLAN have MTU 1450, but if I watch ip link show, I
> can see that ppp0 interface creates with MTU of 1500.
>
> Best regards,
>
> Martins
>
>
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