Added section about non --net=host networking

[whi-tw]

I've found I needed this, as all traffic was routing externally, causing havoc with stream quality and download caps.

--net=host is great, but I'm running openHAB on the same server, so this is a necessity.

This information comes from #36 but could probably do with being added to the readme.

[LinuxServer-CI]

Can an admin please whisper to jenkins to test this PR.

[sparklyballs]

we've been discussing an overhaul of sorts on our README's en masse.

[ghost]

Thank you for the instructions 👍

[lonix]

@sparklyballs I think this PR should be accepted in the interim. This info is very useful.

[lonix]

Is this PR just gonna linger for ever ?, at this point decline it, if you dont want it.
@sparklyballs

[LinuxServer-CI]

Can an admin please whisper to jenkins to test this PR.

[bentech]

Can't you just set your 'LAN Networks' under Settings->Server->Network?

e.g. '192.168.0.0/16'

[whi-tw]

Can't you just set your 'LAN Networks' under Settings->Server->Network?

e.g. '192.168.0.0/16'

For sure, that's a setting within Plex, but it doesn't have the same effect. Without customConnections, PMS isn't aware of the correct server IP - only the bridged IP.

As far as I can see, clients use this setting - it is the IP that they use to test if the server is local or not.

This setting is used in the official plexinc container and has been documented as a solution in another issue on this repo: #97

As this seems to be a confirmed issue, it could be an idea to do something along the lines of the 'official' container wrt handling this config modification using env vars.

[stefangordon]

Oh, this information is hugely important and -net=host isn't always practical (not even possible on Docker For Mac). Why not merge it?

Been trying to figure this out for days.

[aptalca]

I'm not in favor of encouraging users to manually edit their preferences.xml as that is managed by plex itself. If users want to go ahead and do it, they are taking that risk.

We are considering adding the plex claim token to enable server claiming in circumstances where net=host is not a possibility.

But we have been slammed with other work lately (multi-arch images, new pipeline for jenkins, rebasing to alpine 3.9 & ubuntu bionic, etc.)