[PLUG] Cisco PIX firewall DMZ and Redhat 7.3

Matt Alexander m at netpro.to
Sat Jun 15 17:49:27 UTC 2002


Unplug the new server and try pinging 172.16.1.66 from another box within
your DMZ.  If you get a response, then you've either got another server
with the same IP address or you've inadvertently assigned .66 to your DMZ
interface.  I've worked a lot with the Cisco PIX, so let me know if you
need any help configuring your rules between the inside, outside, dmz, and
any other interfaces you might have.
~M


On Sat, 15 Jun 2002, Sean, Sharon and Kyle Harbour wrote:

> I have a strange problem. I've got a Redhat 7.3 box plugged directly
> into a DMZ port on a Cisco PIX. Everything is fine until I reboot the
> Redhat box, then it refuses to bring up eth0 because it detects
> another host using the assigned address, even though it is the only
> box in the DMZ at this point. If I unplug the cable while booting,
> then plug it back in, it works fine. This happened at quitting time
> on Friday, and it's not a production server yet, so I let it go for
> now. I'll put a sniffer on it to see whats going on Monday, but it
> seems like the box is detecting a response from the PIX when
> initializing the interface. Has anybody run into this before? Is
> there a way to force an interface to come up with a certain IP
> address, even if another host on the subnet is already using it?
> The DMZ gateway is 172.16.1.65, the server is
> 172.16.1.66/255.255.255.224
>
> Sean Harbour
>
>
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