2600 Configuration Help

[spudnuts]

Brought up this question before but no replies so here it goes again.

Can you control the signal coming out of a serial interface on a cisco 2620 router?

I need to do something like DDR or maybe something like a floating static route, but instead of it being ISDN or async, I need the interesting traffic to activate a serial interface and keep the interface down (spoofing) when there is no traffic.

This is a standard IP network but this signal is causing problems with other devices and users. Only one user can be up on this particular network at any one time, if there are more than one router turned on, it's causing the first user to grab the entire network and I need it to be a half-duplex network (One user at a time).

If I could control the serial up/down state based on interesting traffic (outbound) than it should work fine.

Any Ideas

SpudNuts(ITC), USN(Ret),CCNP,CST

 

[pmesjar]

I don't know if I understand your problem quite right, but have you considered backup interfaces? Or Policy Based Routing? Since you are CCNP I guess you must know about these features...

The following is quoted directly from IOS 12.3 Dial technologies configuration guide:

For a backup serial interface, an external DCE device, such as a modem attached to a circuit-switched
service, must be connected to the backup serial interface. The external device must be capable of responding to a data terminal ready (DTR) Active signal by automatically dialing the preconfigured telephone number of the remote site.

Peter Mesjar
CCNP, A+ certified
pmesjar@centrum.sk

"The only true wisdom is in knowing you know nothing.

 

[spudnuts]

Yeah, thought of that but the problem is that the backup your referring to is a dialer and this serial interface connects to an external modem that does not support dialing. It's difficult to explain but this network accesses a modem that is connected to a satcom transceiver. When the RTS is sent by the serial interface, it forces the modem to key the tranceiver. Since this key is up the entire time the router interface is active, the channel that transceiver is on is locked online for that user until the router is either shut off or the interface is shutdown.

What I need is to use the serial interface like DDR but without dialing. Policy based won't work because as far as i've know, you can't set policy basing to bring the interface down when there is no traffic. Even with an access list the interface is up and that locks the channel on this network. The network is already a secure network, every user on it is authorized to be on it and no others can access it.

I need a way to control the RTS from the serial interface or like DDR "Spoofing", that way the interface will be down (Spoofing) until interesting traffic (IP) hits the interface and brings it up. Then, when the user is finished sending traffic, the interface returns to down (Spoofing).

Hope that explains it more clearly.

SpudNuts(ITC), USN(Ret),CCNP,CST