Cisco routers are a brand of networking equipment that allows users to create local area networks. Cisco routers are generally used in corporate environments and require specialised training and certifications to properly administer. If you have a Cisco router and want to quickly open the ports used by the Microsoft Exchange Server so it can function properly, which ports you open depends on how your particular exchange server is set up, but in general, the most common ports are ports 110 and 25, the incoming and outgoing mail server ports.
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Connect to your Cisco router via telnet. This process varies widely depending on the router model you have, along with your particular network configuration, so consult your network administrator if you are unsure how to connect to your router.
Type "access-list port_number allow tcp any host $router_IP_Address" into the command line, where "port_number" is the Exchange Server Port you want to allow through the router and "router_IP_Address" is the IP address of the Cisco router.
Press "Enter" to add the port rule to your router. Repeat Steps 2 and 3 as needed to open as many ports as are required by your particular Exchange Server set-up.
Close your telnet session by typing "exit" when you are finished opening ports on your Cisco router.
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