How to access console port on pan-2020 using a dial up modem

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How to access console port on pan-2020 using a dial up modem

L1 Bithead

I have a single remote firewall (pa-2020) where I would like to set up the console port to be accessible via dialup modem.  I called Paloalto support and they only were able to say that most people use a terminal server like an avocent type server to gain access to the console and haven't worked with anyone trying to use a modem.  (I have one firewall and don't want to spend money for an avocent console server...)  They could only tell me the basic settings such as N-8-1 9600 baud etc.  I have a modem plugged into the console port of the firewall and I can dial it and it will connect at 9600 with data compression vbis42 but I can't get any further than that.  (I type on the keyboard but no response)  My modem is configured to have no result codes (q1), no echo (e0), modem speed 9600 (s37=9), autoanwser (s0=1), no flow control (&k0), ignore DTR (&d0), and write config to nvram (&w).  I have been using the cisco document found here as a reference:  Connecting a Modem to the Console Port on Catalyst Switches - Cisco Systems

Has anyone successfully connected a dial up modem to the console port?  If so can you help me with some things to try?

12 REPLIES 12

L7 Applicator

While I cannot answer your question directly as I have never attempted a modem connection to the console port, you may be able to get away with a minimal investment if you have a linux server. I found this site, which goes over the details of getting a fully-functional linux-based console server for very little cost investment.

Linux-based serial console server | Network Tech Blog

Hope this helps at least a little bit if you can't get the modem itself to work.

-Greg

L4 Transporter

I'm really stretching here, but... aren't the AUX ports on a Cisco router null modem ports? Have you tried connecting a null modem style serial cable from your modem to the port on the PA?

It's that whole DTE versus DCE difference with serial cables... the port on the PA might expect you to connect with a DTE serial device when your modem is DCE, hence the null modem cable to "flip it over" from DTE to DCE.

Yes the cisco switches and routers will have aux ports but they also just have regular console ports which that document link I posted describes...

I assume you mean the roll over cable, so I tried that and still the same result where it will say it connects at 9600 with vbis42 compression but then i can't get any response.  No data gets received or sent that I can see, nothing happens after hitting keys on the keyboard etc...Any other ideas? 

Also my modem comes with a serial cable with both a db9 and db25 connector on the same cable, does it matter which one I use?  I have tried connecting the rj45 rollover cable to the console port of the firewall, and then from that I plug into a db9 that plugs into the db9 of the cable to the modem.  The db25 portion of the modem cable is not connected to anything...

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