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Using a cisco ASA device with an external IP of (interface OUTSIDE) and an internal subnet of (interface INSIDE), how can I configure the ASA so that all traffic to a specific port on the external interface gets directed to an internal server (and the response is returned)

For example, if an external user connects to I want it redirected to;

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1 Answer 1

up vote 6 down vote accepted

TO get this working you will need to setup a static nat, and add to the access-list to allow the traffic once. (NAT happens before access-list: Details of Order of operations)

Static NAT

Static NAT's on cisco have always been weird (for me at least). Basic thing to remember is (HIGH,LOW) LOW, HIGH for this command.

static (inside,outside) tcp 5000 8080 netmask 0 0


This acl will need to be applied to what ever you have named your access-list attached to OUTSIDE interface. (Change: *outside_acl* )

access-list outside_acl extended permit tcp any host eq 8080


Sorry I don't have my test ASA in front of me, but this should be very close.

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spot-on; I just set the Static NAT, confirmed that packets were then being rejected by the ACLs, and tweaked the ACL. – DrStalker Aug 14 '09 at 5:31
Glad I could help - Have a good day/night – Jeremy Rossi Aug 14 '09 at 7:13

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