Allow DMZ to the Internet

Answered Question
May 5th, 2009

Is it a good idea to allow DMZ devices access to the Internet, ie:

nat (dmz) 1 access-list dmzout

Obviously they are accessible from the outside using static nat's but should they be allowed to initiate traffic to the Internet?

I have this problem too.
0 votes
Correct Answer by Jon Marshall about 7 years 7 months ago

Roni

Really depends on what applications your DMZ servers are running. If they are using static nats's then you won't need the nat (dmz) 1 access-list dmzout statement as static statments are bi-directional.

Good example of where you may need dmz servers to be able to initiate connections to Internet is for DNS ie. your mail server on the DMZ needs to resolve remote IP addresses to hostnames.

Jon

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mdombek_biz Tue, 05/05/2009 - 10:10

Depends on what you want in most cisco documents for ASA: LAN DMZ Outside design the DMZ is allowed to connect to the internet. eg by security level permissions.

cheers

Michael

Correct Answer
Jon Marshall Tue, 05/05/2009 - 14:33

Roni

Really depends on what applications your DMZ servers are running. If they are using static nats's then you won't need the nat (dmz) 1 access-list dmzout statement as static statments are bi-directional.

Good example of where you may need dmz servers to be able to initiate connections to Internet is for DNS ie. your mail server on the DMZ needs to resolve remote IP addresses to hostnames.

Jon

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