I'm in over my head with this Cisco router we have (881w). If anyone has a recommendation for some dummy-level reading, I'd appreciate a link or title. Cisco documentation presumes a level of knowledge which I don't have.
My specific problem right now is that I'm trying to port forward/redirect external web access using a specific port to an internal device using the standard www port 80. Details:
External IP: 188.8.131.52
External hostname: alpha.example.com
External port: 8888
Internal IP: 192.168.1.2
Internal port: 80
So, I'm trying to hit http://alpha.example.com:8888 from the web and pull the site from 192.168.1.2. (Incidentally, the direct IP access works internally on the LAN with no problems.)
I've added the following lines to the config. They are just copies of sections that work for opening up remote desktop for some users, the only difference being that I'm using the same port numbers externally and internally for that (e.g. alpha.example.com:5555 => 192.168.1.200:5555).
ip port-map user-protocol--6 port tcp 8888 description Lacie-web-access
class-map type inspect match-any Lacie-nat-web-access
match protocol user-protocol--6
class-map type inspect match-all sdm-cls-sdm-pol-NATOutsideToInside-1-6
match class-map Lacie-nat-web-access
match access-group name Lacie-web-access
ip access-list extended Lacie-web-access
remark CCP_ACL Category=128
permit ip any host 192.168.1.2
ip nat inside source static tcp 192.168.1.2 80 184.108.40.206 8888 extendable
Again, this works for remote desktop with matching port numbers, so I'm guessing there may be some other http/www traffic restriction that I don't recognize. FWIW, I can't reconfigure the internal device's web port, so I can't test whether the port number mismatch is an issue.