| Author |
dialup to 7206 problem..
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| supergoku0 2001-07-17, 6:07 am |
| Dear all,
A modem is connected to the AUX port of a 7206 router for remote dial-in. However I have problem in making this work; my current config is:
1) 7206 router with the following commands under "line aux 0":
modem dialin
speed 9600
2) Zyxel Modem 1496E
3) Adaptor for 7206 (DB25F to RJ45)
4) Adaptor for 7206 (DB25M to RJ45)
5) roll-over cable connecting 3,4 above.
The situation being that the modem can answer the call from a remote location dialling in the router but noting shows up once conected.
If I use a straight DB25-to-DB25 then "rubbish" shows up when connected.
Does the AUX port connecting cisco router requires a "special adaptor"?
Could you guys shed me some lights into my problem(router config, etc)?
TIA,
Goku | |
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| Cisco router aux port act as DTE. If you want to connect DTE to modem, DCE device, you will need a straight through cable. As you said that you use the roll connection, so you have to connect it with a roll and straigth connector because roll (cable) + roll (connector) + straight (connector) = straight (connection).
Unlike the console which doesn't have flow control, AUX port does. Try configure these followings after issue line aux 0,
flowcontrol hardware
stopbit 1
Hope this help, | |
| Retired-Mod 2001-07-18, 3:32 am |
| Better know the speed set on the aux port too...default is 9600 baud and modem should be forced to 9600 to match.
Retired | |
| MadChef 2001-07-18, 5:24 am |
| Why are you using the aux port for cli access instead of the console?
Just curious as to what your intentions are.
MadChef | |
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| Maybe he want to let someone, maybe vendor if he is in customer role, to dial in to configure the router.
By the way, if your company has a security policy on this high-end router, you should reconsider this design. | |
| supergoku0 2001-07-18, 9:17 am |
| Thanks for your comments gentlemen,
The problem is now solved after replacing the straight cable(the old one failed!!) :-}
I also found that if you remove the line "modem dialin" or replace it with "modem host"(anyone knows what it does?), then you cannot not dial in.
Lastly, the need for remote dialin is that since the router is co-located in a third party premises that in case of failed "IP" connectivity we can dail in to see what happens.
Cheers!
Goku | |
| MadChef 2001-07-18, 11:59 am |
| quote:
Originally posted by supergoku0
Lastly, the need for remote dialin is that since the router is co-located in a third party premises that in case of failed "IP" connectivity we can dail in to see what happens.
Again, why not use the console? The router must have booted correctly and be operational for you to use the aux port. Dialing into the console allows you to actually watch the device boot, enter rommon, etc. What's driving the use of the aux port rather than the console, especially if you're connecting at 9600.
MadChef | |
| Retired-Mod 2001-07-18, 5:32 pm |
| The problem with having a modem attached to a console port is that in the event both lose power and come back on at the same time the combined initialization process (modem's fault) causes the router to boot into ROMMON and that really sux, so my advice is to stay with the aux port.
Retired | |
| MadChef 2001-07-19, 5:05 am |
| True. I've run into that problem, but usually only on the initial install. After that, things don't tend to power on at the same time because they aren't powered off. I've come to the be of the opinion that the advantages of having the modem cabled to the con port outweigh the risk of having boot interrupted. If I need to dial into the aux port I like to set the speed at 115200 and make a ppp connection which gives me some other options. Just an opinion.
I think it was Skipster who had the cool device that powered up modems several minutes after the routers. Very cool.
MadChef | |
| Retired-Mod 2001-07-19, 4:28 pm |
| All very good points MC especially if you are dealing with a network core that has emergency and tons of backup power. Unfortunately I have 200+ remote offices that don't have that luxury so prolonged power outages often exceed my backup power capacity which does cause the modem and router to power up at the same time. Guess I shoulda been clearer about my situation but now ya can guess how bad it is for a remote router to boot into ROMMON....thus my conclusion. The lesson to be learned is that all answers ain't the best for all situations 
Retired | |
| The Reamer 2001-07-19, 5:42 pm |
| That device referred to by MadChef is the APC MasterSwitch.
Reamer | |
| MadChef 2001-07-20, 6:00 am |
| quote:
Originally posted by Retired-Mod
Unfortunately I have 200+ remote offices that don't have that luxury so prolonged power outages often exceed my backup power capacity which does cause the modem and router to power up at the same time.
Retired
Good point. I would probably come to the same conclusion in your situation. I guess the point is you need to be able to adapt your design to your particular network.
MadChef |
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