[AusNOG] GRE PPTP not working with Some routes.

[Kayvan Farzaneh]

I would lower the MTU to 1400 on both ends, maybe somewhere in the path
doesn't like fragmentation and GRE puts some overheads on the packet.


On Tue, Aug 27, 2013 at 7:09 PM, Jason Firmino <jason.firmino at gmail.com>wrote:

> Hi guys,
>
> Just wondering if anyone in the list has experienced or knows about what
> is happening to me...
>
> I have a proxy server with pptp for a while now and it's been working fine
> for 2 years now, the thing is last week I had a partner trying to VPN into
> the office from Germany but its failing with a GRE write failed error.
>
> BUT... After a bunch of tests I managed to narrow down the problem and
> found that only the Singapore route traffic that goes trough Singtel has
> this error... Every other route is fine... Crazy right!?
>
> I have a juniper srx with passtrough enabled and a Optus fibre connection.
> Again, everything is fine from every other provider/route. From that
> Singapore route it only works 1 in 10 attempts... Yes, sometimes it
> works... WEIRD!!!
>
> Any ideas?
>
> Cheers,
> Jason
>
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