cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
723
Views
0
Helpful
1
Replies

Disabling ports on Cisco 2600 & 2800 series routers

I frequently use the Cisco 2600 & 2800 series routers to connect serial devices to a TCP/IP network. For example, I will connect the serial interface of a modem to the Cisco router and then create a reverse telnet connection from the TCP/IP network to the appropriate TTY port on the router to communicate with that modem. By default, when I enable one of the async. lines on the router, it opens 4 different ports (2000, 4000, 6000, & 9000 + tty line; so for example, for tty1 it would open 2001, 4001, 6001 and 9001). I understand all of these different ports are for different modes if you will. I only need the 4000 port numbers, which are basically raw data mode. I am trying to 'harden' these devices and disable any non-necessary ports. Is there a way to enable a line, but not open all 4 of those ports?

1 Reply 1

paolo bevilacqua
Hall of Fame
Hall of Fame

No. Use an ACL.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: