Newbie, Nat0 access-list bidirectional Question?

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Apr 1st, 2007
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Hi if I want traffic to be initiated from the inside and dmz without translation. I understand I can accomplish this by doing a

transparent translation like:


static(inside, dmz) inside address, inside address netmask...



however if I was to use nat0 access list such as..


nat (inside) 0 access-list noNatInside

access list noNatInside permit inside address to dmz address



do I also need...



nat (dmz) 0 access-list noNatDMZ

access list noNatInside permit dmz address to inside address




or is the nat0 access list, noNatInside bidirectional in that it will allow the reverse reading of, dmz to inside initiated traffic, provided the ACL exist to permit the traffic of course.


thanks in advance

hermo

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Jon Marshall Sun, 04/01/2007 - 10:06
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Hi


Is this a pix firewall ?


You can turn off NAT altogether with v7.0 for the Pix or ASA.


But assuming you don't want to turn off NAT or you can't because your are running an earlier version of code, if you want traffic to be initiated from the DMZ to the inside you will need the static statement.


If traffic was only ever initiated from inside to the DMZ you would be fine with your "nat (inside) 0 access-list NoNatinside" statement.


HTH


Jon

controlcircle Sun, 04/01/2007 - 13:14
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yes its pix firewall running version 6.3

thanks for the answer. I will go with the static statement. regards

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