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?

2 Answers 2


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.

  • I am using ethernet cable. But how do I detect it on my FreeBSD machine? Thanks.
    – hari
    Commented Aug 19, 2012 at 18:16
  • What protocol on top of the ethernet does the Juniper switch console app run on?
    – EhevuTov
    Commented Aug 20, 2012 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: http://kb.juniper.net/InfoCenter/index?page=content&id=KB13272&actp=RSS

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

  • 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
    Commented Sep 4, 2012 at 3:44
  • @hari I just googled "juniper srx210 console" and the first hit I got clearly shows a serial console: juniper.net/techpubs/en_US/release-independent/junos/topics/… and they say the adapter is provided in the "accessory box"
    – Alan Curry
    Commented Sep 4, 2012 at 3:52
  • Okay, and, can I connect it directly to a monitor screen?
    – hari
    Commented Sep 5, 2012 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
    Commented Sep 5, 2012 at 20:36

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .