I'm trying to configure the phone configuration on my business' Cisco 2811 router. Without buying a bunch of dongles and connecting through the console port of the router, I'd like to try to SSH or Telnet into the router. My problem is that I don't know the IP of the Cisco 2811 router. The topology goes something like this.
DSL -> DSL Motorola Modem -> Cisco 2950 Switch -> Cisco 2811 Router -> Phones
I'm pretty sure that the modem is acting as a DHCP server and being a pretty dumb modem it doesn't offer a DHCP table to show which devices are getting which IP's.
What I basically need to do is backtrack through a workstation, to the switch, to somehow get the IP of the switch and SSH/Telnet into the switch to find out which IP the router is getting. Once I have the IP of the router I can try SSH/Telnetting into the router and be able to configure it that way.
Someone please correct me if I'm wrong but would this be a way to go about this?