Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am using FreeBSD to connect to a juniper switch using console connection.

I have crossover network cable: 1 end in switch and other in my freebsd laptop.

What do I need in freebsd and how do I watch what is going on when I poweron the switch?

share|improve this question

A console connection has to physically be made using a console cable to the device using either a special ethernet or serial cable. See if you can do a virtual console connection over ssh or telnet.

share|improve this answer
I am using ethernet cable. But how do I detect it on my FreeBSD machine? Thanks. – hari Aug 19 '12 at 18:16
What protocol on top of the ethernet does the Juniper switch console app run on? – EhevuTov Aug 20 '12 at 0:18

This point has not been made clearly enough yet: Serious Networking Equipment often has an RJ-45 console port that is not ethernet at all. You need a cable or adapter with RJ-45 on one end and DB-25 or 9 on the other end. (and on a PC with no serial ports you probably need a USB serial adapter too.)

Here's an example of documentation for a console cable:

There are many variants, so you have to get specific with the model number to find out for sure what you need.

share|improve this answer
I have SRX 210 switch. Which has ethernet like console port. I am using cross-over Ethernet cable. Should I not use that? do I need that rj45 to db9 adapter? and attach that to my laptops serial port? – hari Sep 4 '12 at 3:44
@hari I just googled "juniper srx210 console" and the first hit I got clearly shows a serial console:… and they say the adapter is provided in the "accessory box" – Alan Curry Sep 4 '12 at 3:52
Okay, and, can I connect it directly to a monitor screen? – hari Sep 5 '12 at 5:10
That question froze by brain. I don't know how to proceed. Have you never seen a serial port before? – Alan Curry Sep 5 '12 at 20:36

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.