Internet users access to smtp server located on DMZ1 on ASA5510 by port 25, so I configured a static and ACL lines:
static (DMZ1,Outside) x.x.x.x y.y.y.y netmask 255.255.255.255
access-list Outside_In extended permit tcp any host x.x.x.x eq 25
access-group Outside_In in interface Outside
All is working fine, but now I need that for some users access to smtp server through port 26, so I need to configure the line:
access-list Outside_In extended permit tcp any host x.x.x.x eq 26
But, how can I made an internal port forwarding so all connections from port 26 goes to port 25 to smtp server??
Is very urgent for me, can you help me with some ideas.