Opened an issue on strongswan: https://wiki.strongswan.org/issues/3364

It seems that there is no way for an Android app to avoid that it is suspended. 
No keepalives can be sent and NAT will time out. 

It was mentioned that a port change after NAT timeout shall be accepted by the 
server: https://tools.ietf.org/html/rfc7296#section-2.23 Is this feature 
missing on libreswan? 

Is there a way to force the server to send NAT-T keep-alives to a server, just 
to keep the carrier NAT from timing out?


> On 5 Mar 2020, at 22:30, Paul Wouters <[email protected]> wrote:
> 
> On iPhones, any wake up from sleep or network change will send a MOBIKE 
> UPDATE message. I don’t know about strongswan client behaviour.
> 
> It might be a strongswan bug. 
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