Contents

Introduction

Default Ports

Table of Reverse Port Services

Introduction

This document describes the TCP and UDP ports that Cisco CGR2010 platform uses for applications and intranetwork communications.

Default Ports

Cisco CGR2010 has these ports enabled by default :

Router#show control-plane host open-ports

Active internet connections (servers and established)

Prot               Local Address             Foreign Address                  Service    State

tcp                        *:23                         *:0                   Telnet   LISTEN

Router#

In case that SSH is enabled in the router, port 22 is open in the CGR 2010:

Router#show control-plane host open-ports

Active internet connections (servers and established)

Prot               Local Address             Foreign Address                 Service    State

tcp                        *:22                         *:0              SSH-Server   LISTEN

tcp                        *:23                         *:0                  Telnet   LISTEN

Use Nmap to verify the ports that are enabled in the router.

C:\Program Files (x86)\Nmap>nmap -sS -p1-10000 10.31.126.137

Starting Nmap 7.70 ( https://nmap.org ) at 2018-12-06 20:05 Central Standard Time (Mexico)

Nmap scan report for 10.31.126.137

Host is up (0.0054s latency).

Not shown: 9998 closed ports

PORT STATE SERVICE

22/tcp open ssh

23/tcp open telnet

Nmap done: 1 IP address (1 host up) scanned in 14.23 seconds

C:\Program Files (x86)\Nmap>

When a switch module is installed on the CGR2010, the router opens the ports 2003, 4003, 6003 and 9003. Take a look at the Table.

C:\Program Files (x86)\Nmap>nmap -sS -p1-10000 10.31.126.137

Starting Nmap 7.70 ( https://nmap.org ) at 2018-12-06 20:22 Central Standard Time (Mexico)

Nmap scan report for 10.31.126.137

Host is up (0.0067s latency).

Not shown: 9994 closed ports

PORT STATE SERVICE

22/tcp open ssh

23/tcp open telnet

2003/tcp open finger

4003/tcp open pxc-splr-ft

6003/tcp open X11:3

9003/tcp open unknown

Nmap done: 1 IP address (1 host up) scanned in 12.54 seconds

C:\Program Files (x86)\Nmap>

Table of Reverse Port Services

Service Name

Reserved Port Range

Normal Telnet

2000-2xxx

Raw TCP

4000-4xxx

Telnet Binary Mode

6000-6xxx

Reverse Xremote

9000-9xxx

This behavior is addressed in these CDETS:  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCsh95539