Distinguishing between Internal and external wired networks

Thomas Woerner twoerner at redhat.com
Wed Mar 6 14:13:22 UTC 2013


I just sent an reply for this on -users. Sorry, totally lost this email 
from my radar.

Thomas

On 03/04/2013 08:20 PM, Colin Simpson wrote:
> 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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