Help answer threads with 0 replies.
Go Back > Forums > Linux Forums > Linux - Newbie
User Name
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!


  Search this Thread
Old 04-28-2006, 11:37 AM   #1
LQ Newbie
Registered: Feb 2006
Location: In my own little world
Distribution: Slackware 10.2
Posts: 7

Rep: Reputation: 0
Can't find a Cisco Switch's IP address

Ok, I feel like an idoit for posting this question but I'm just getting tired of wondering. I've been assigned in my class to configure a Cisco Catalyst 2900 series XL switch. One problem, I have no idea what its IP is. I looked up at to try to find what its default IP is but I came up empty. I know when I did this in Windows XP last semester there was a network terminal program I used to get into it. I'm sure slackware has something like that as well, but I'm not sure what or where it is. Can anyone give me a hand to getting inside this thing?
Old 04-28-2006, 11:56 AM   #2
Registered: Dec 2004
Distribution: gentoo
Posts: 190

Rep: Reputation: 30
Yeah, I think the 2900 series will let you log in with telnet. However, if an IP address is not assigned (or telnet not enabled on the switch) you will probably need to connect to the serial port on the back of the switch to access the console (I think that model has one, though you may need a rollover cable). Some newer switches may have a web interface as well (I don't know about the 2900XL... perhaps I'm thinking 3Com). That may make things really easy.

If you can't find the IP of the switch, try running "nmap" to do a port-scan of your lan. Then you may be able to find the IP and port you need.
Old 04-28-2006, 12:35 PM   #3
LQ Guru
Registered: Oct 2005
Location: Northeast Ohio
Distribution: linuxdebian
Posts: 7,241
Blog Entries: 5

Rep: Reputation: 190Reputation: 190
Why not connect a console cable directly to the switch and view the config ? trying to guess the IP would be difficult especially if someone has changed the config.

By default Cisco Switches do not have an IP address to begin with.

9600 baud
8 bit
no parity
1 stop bit

Use the Serial console cable provided by Cisco..

minicom will allow you to connect directly to the Switch using the serial port on your laptop via the shell
seyon is a X11 based communications package that should work as well

From a windows machine I would use terraterm Pro as the application


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to find an IP address from the MAC address of a remote machine ? jitz Linux - General 3 01-03-2006 08:55 AM
How to find IP address of a machine if I know their MAC Address dysenteryduke Linux - Networking 13 09-12-2005 11:21 AM
How to find MAC address of a specified IP address ? longtongfish Programming 1 07-12-2005 04:26 PM
How do I find my ip address skibum Linux - Networking 1 11-18-2003 09:19 PM
How do I find my IP address? Greenhorn Linux - Newbie 6 02-10-2003 09:47 PM > Forums > Linux Forums > Linux - Newbie

All times are GMT -5. The time now is 07:10 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration