[strongSwan] Can anyone explain VPN oddity

[Jafar Al-Gharaibeh]

Jody,
     It is really hard to guess what the problem is without 
information/logs.
    In most situations where I had this issue (OK on WiFi but not OK on 
cell) it turned out to be MTU related.
     I am almost certain that the problem you are seeing is caused by 
broken PMTU.
    See the references below for some insight and possible solutions.

Regards,
Jafar

[1] 
https://wiki.strongswan.org/projects/strongswan/wiki/ForwardingAndSplitTunneling#MTUMSS-issues
[2] 
https://www.zeitgeist.se/2013/11/26/mtu-woes-in-ipsec-tunnels-how-to-fix/
[3] https://wiki.strongswan.org/issues/1025
[4] https://wiki.strongswan.org/issues/632#note-14



On 5/11/2018 5:21 PM, Jody Whitesides wrote:
> I have a working VPN that can connect to the internet at large. That when a device is connected via WIFI it can also connect to email and websites hosted on the same server as the VPN. However, when a device is connected via a cellular connection to the VPN, it can connect to the internet at large, but cannot connect to email and websites on the same server.
>
> Can anyone explain why this would occur? What is the difference between a wild WIFI connection and a mobile cellular connection that would cause the VPN to react differently to its host server?
>
> Thank you,
> Jody

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