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Are you using OpenVPN? In that case I believe you need the following
options on the client:

mssfix 1200
tun-mtu 1200

___

John Petrini

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On Thu, Jan 5, 2017 at 11:48 AM, Mārtiņš Jakubovičs <
martins-lists at hostnet.lv> wrote:

> I am tying, but all the time VPN starts with 1500 MTU.
>
> On 2017.01.05. 18:46, John Petrini wrote:
>
> Is ppp0 your VPN interface? Have you tried lowering thee MTU on the VPN?
>
> ___
>
> John Petrini
>
> NOC Systems Administrator   //   *CoreDial, LLC*   //   coredial.com
>    //   [image: Twitter] <https://twitter.com/coredial>   [image:
> LinkedIn] <http://www.linkedin.com/company/99631>   [image: Google Plus]
> <https://plus.google.com/104062177220750809525/posts>   [image: Blog]
> <http://success.coredial.com/blog>
> Hillcrest I, 751 Arbor Way, Suite 150, Blue Bell PA, 19422
> *P: *215.297.4400 x232   //   *F: *215.297.4401   //   *E: *
> <jpetrini at coredial.com>jpetrini at coredial.com
>
> [image: Exceptional people. Proven Processes. Innovative Technology.
> Discover CoreDial - watch our video]
> <http://cta-redirect.hubspot.com/cta/redirect/210539/4c492538-6e4b-445e-9480-bef676787085>
>
> The information transmitted is intended only for the person or entity to
> which it is addressed and may contain confidential and/or privileged
> material. Any review, retransmission,  dissemination or other use of, or
> taking of any action in reliance upon, this information by persons or
> entities other than the intended recipient is prohibited. If you received
> this in error, please contact the sender and delete the material from any
> computer.
>
> On Thu, Jan 5, 2017 at 11:20 AM, Mārtiņš Jakubovičs <
> <martins-lists at hostnet.lv>martins-lists at hostnet.lv> wrote:
>
>> Network it self are working great, but I just have issue with PPTP.
>>
>> If I lower MTU in instance interface, it didn't help.
>> On 2017.01.05. 18:11, Prashant Shetty wrote:
>>
>> 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>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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