I have configured a 2621 to access a network via a NT4 RAS server, using a modem on the aux port. This seems to work quite well. BUT, when I try to use this over a satellite link there seems to be a problem when the end to end delay exceeds a second or so. What I see is the packet leave the router but never return. Also occasionally there is a large amount of APPP65 traffic in and out of the router, for no apparent reason (something resyncing perhaps?). I also experience a problem where a ping request is replied to at the async port but never seems to meet the higher protocols, i.e. the request hits the router but not IP/ICMP as if it is stuck in a buffer or being dropped. I do not experience these problems if I am using the modem attached directly to the router. (The satellite provides the RS232 comms between router and modem)
Does anyone know of a timeout value that can be increased to allow better stability? or have any other ideas.
The router config
(BTW The modem printer command is because the modem has a weird interface where DCD (DSR) cannot be controlled and is always set high)
We should compare the two different async chips the modem and the sat-modem are using and nail it down. What models are these two different devices? Hopefully some research with thier documentation can help us out.
I'm not sure what the chipset is but I do know that the modem is a Motorola codex 3265 fast and the mux is a GDC (General Datacom, I think) minimux (now obsolete!) The sat channel is seriously strange. All interfaces present as DCE and the cable to the modem is DCD from modem to RTS on sat channel (otherwise no comms at all end to end) TX / RX crossed, and DSR from sat channel to DTR on the modem. Flow control is handled by the sat channel at the 2621 end by RTS/CTS, but it looks to me like these are simply linked together (no output level at all from CTS without input from RTS. All signals jammed high on the modem. (DSR, DCD, DTR, RTS)
DCD is permanently high from the sat channel to the 2621 and DTR from 2621 seems to have no effect at all on the link or the remote modem, so I guess it's not passed through. RTS/CTS flow control as above.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...