[strongSwan] ipsec routes removed when interface down and not reinstated

Alexander Hill alex at hill.net.au
Mon Oct 31 10:20:39 CET 2016

Hi Noel,

Just a followup to this:

charon monitors changes to interfaces and IP addresses and tries to recover
from any changes. If for example I unplug my network cable while a wifi
connection is active, the route to the virtual subnet is removed by the
kernel and re-added by charon on the correct interface.

The case where no new route is immediately available is a corner case, but
I don't think one that doesn't deserve to be handled in the same way.

What do you think?


On Fri, 28 Oct 2016 at 23:33 Alexander Hill <alex at hill.net.au> wrote:

Ok, thanks. That makes sense.

Triggering a reconnect on if-up should do the trick then.

Cheers, Alex
On Fri., 28 Oct. 2016 at 11:09 pm, Noel Kuntze <noel at familie-kuntze.de>

On 28.10.2016 07:07, Alexander Hill wrote:
> What's the thing that removes the route when the network cable is
unplugged - and can that thing also re-add the route when it's plugged back

I think the kernel does that. There's no userspace component involved in
this. But it doesn't add anything back.


Mit freundlichen Grüßen/Kind Regards,
Noel Kuntze

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