[lug] Cisco 675 router

[Andrew Reberry]

Hey all, I have a machine which is connected to the Internet through a Cisco 675 router.  The router is connected to USWest.net, and they are providing me with a dynamic IP address..  Long story, but static IP addressing is not probable in this situation.

I need to get access to this machine when away from home, but I have two problems with doing so:

1) I have no idea how to get through this router.
2) The dynamic IP address

Problem 1:

Does anyone have any idea how to bypass the cisco router?  I can log in to the router when I know the IP address.  However, I cant figure out how to get from the router to my system at all.   The router is connected directly to a network card attached to the SuSE machine.  I have read the whole manual covering the Cisco 675, but it didn't give me any hints on how I would bypass the system.  USWest is not helpful here and has no idea how I would go about getting this done.

The network card I'm using gets an ip address using DHCP.  This address is set by the cisco router I believe, and not USWest.  So to get to my machine, in theory, I would have to telnet into the router, and then telnet into the machine.  However, telneting from the router does not seem possible.

Problem 2:

When away from home I will not know what the dynamic IP address is.  Could I write a program that would send me an email every day telling me what static IP address my computer currently has.  Or have this program post the IP address to another server which is connected to the Internet?  Say to my homepage or something else?  If this is a viable solution, what sort of program would I want to write?  A shell script?  C++ program?

One other thing which makes this hard is the fact that when I run 'ifconfig' I get the DHCP address of the network card.  To find out what IP address the world sees me at I usually go to the following URL where it tells me so.  http://www.simflex.com/scripts/ip.exe.  This means I would have to get my IP address from somewhere outside my system before I send it to myself.

Any suggestions and or solutions always welcome.  I know doing this is a bit problematic, but am trying to figure it out anyway.

Andrew Reberry
reberrya at colorado.edu
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