[CentOS] Firewall for virtual machines

Brian Mathis brian.mathis at gmail.com
Fri Dec 11 22:07:24 UTC 2009

On Fri, Dec 11, 2009 at 4:50 PM, MHR <mhullrich at gmail.com> wrote:
> I realize I'm not getting a lot of questions answered here lately, and
> I'm going to presume that this is for legitimate reasons (i.e., people
> don't know or are too busy to think about it), not because they seem
> stupid (if they do, please tell me, on the list or privately).
> I run Windows as a VMWare guest on top of my CentOS host, and I
> generally have not used a firewall on the guest.  This is partly
> because I only run it rarely, and it seems like a waste when it's
> running on a host that has its own, pretty effective firewall, but
> today I began to wonder - would it be a bad idea (or a complete waste)
> to use a firewall, like ZoneAlarm, on my Windows guest OS?
> Opinions welcome.
> Thanks.
> mhr

This depends on how you have the guest network setup.  If it's in
bridged mode, then the firewall on the host does nothing to protect
the guest.  If you're running NAT mode, then that's sort of like a
(consumer) firewall already, so should be pretty safe.

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