Cisco - DMZ Question

Hi All,

Having a mental blank here.

I have created a DMZ on my Cisco ASA 5510 and I want it to be able to access the internet.

So my server in the DMZ is only allowed to talk to the LAN for SMTP and HTTPS, which I have setup on the firewall.

But I also want the DMZ Server to have internet access. Should I allow it access to the LAN DNS Servers, if so how do I do this, or should it use a public DNS server, if so how should I do this?

Thanks very much.

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configure nat for your dmz

nat (dmz) 1 0 0
global (outside) 1 interface

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So I take it you can ping external servers via IP from the DMZ?

e.g ping

use a public dns server as you want to keep your DMZ network seperate from internal

You can use the Open DNS servers
Actually If you have configured DNS on your ASA and can assign it, that should do it. What is the current DNS setting on the DMZ Server ?

essexboy80Author Commented:
Hi All,

At present I cannot ping external sources from the DMZ Server.

How do I add the NAT setting via the ASDM?

if you have a different public IP you want to assign to the DMZ you can use

global (DMZ) 102 publicIP netmask

where 102 would be your access-list

nat (dmz) 101

or use the e.g by zwart072 above
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