On 2020-03-24 04:45, Patrick O'Callaghan wrote:
> On Tue, 2020-03-24 at 03:27 +0800, Ed Greshko wrote:
>> On 2020-03-23 23:06, Ranjan Maitra wrote:
>>> Yes, indeed. Can it be paused while VPN is not up? And btw, postfix is 
>>> started via systemd but not VPN, that is, it is not started via systemd. 
>> How about running postfix in a VM where the VPN is always up?
> I do this occasionally. A small Fedora server installation is all you
> need.
>
> Though actually what I've wanted to do for a long time is "split
> tunnelling", where some network connections go over the VPN and others
> don't. This should be possible in theory using network namespaces (see
> 'man ip-netns') but I've never managed to get it to work.
>

In looking at the man page I see:

For applications that are aware of network namespaces

and ask the question "What applications are aware of network namespaces"?
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