Distinguishing between Internal and external wired networks
by Colin Simpson
I'm reposting this to firewalld-devel as I'm not getting much traction
on firewalld-users, and maybe to be honest this is more in the line of a
possible enhancement for say AD connected or FreeIPA connected systems.
Thoughts?
Thanks
Colin
====
Hi
We are looking at firewalld just now for deployment in our environment.
One situation we have is that the Ethernet wired interface is set to
simply DHCP. This is used by users on our network and on public network.
Obviously we'd like to allow more ports open on our network than on a
public network. Our network would be zone "internal" and if not our
network would be zone "public", I'd guess.
The option of setting up two different wired setups won't work as users
cannot be relied on to switch to a public setting when off internal
network.
Is there any way we can get firewalld to detect which type of network
it's on. This is probably analogous, I guess, to the way the windows
firewall has a "Domain networks" zone (which they auto detect). Or a way
we can give firewalld a helper script that can tell it which network
it's on. Or something else we haven't thought of...
At the moment we tackle this with using a custom NM dispatcher script
that detects our internal network (by doing an operations against
internal KDC's) and loading the correct firewall into iptables based on
this testing. So maybe this is the way, if firewalld is happy to allow
us, can we or should we force a zone from a dispatcher.d NM script to
switch to the correct zone.
A similar issue is we have a commercial VPN solution that doesn't work
through Network Manager, can we force a change to the zone (it can be
made to execute a script on connection) when the VPN comes up (the VPN
changes routing so all traffic goes via the VPN interface).
How do others tackle this?
Thanks
Colin
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