Charles,
Response in line.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Charles Paver
Sent: Saturday, February 03, 2001 9:46 PM
To: [EMAIL PROTECTED]
Subject: router and subnet question
Hi. I have a 2514 router, 2 hubs, and 2 other
routers (1602 and 2502). The 2514 has 2 serial
interfaces, and 2 ethernet interfaces.
Basically, I have two questions:
1. You know how if you are not on the same subnet you
cannot even ping the router? How come you can telnet
from home into remote sites? I dont really understand
this, at all. I have 3 pcs at home (though, all
old...). The routers ip address is 192.168.0.1 on e0,
and e1 is 172.16.3.1. Shouldnt i be able to ping the
class b address from the class a address router? Or
telnet into it from a different subnet? If not, how
come on somehting like firewallking.com we can access
any router? I dont understnad that!
A device accepts traffic from it's own subnet only. One of the functions of
a router is to provide forwarding between different networks, since it
actually belongs to each network on which it has an interface. So if a node
on the same network as e0 pings a node on the same network as e1, it will be
successful because the router belongs to each network and will forward the
packets. If a node addressed on the same network as e0 is phyisically
attached to e1's network it will not be able to communicate with anyone.
2. How can I simulate two networks. Such as,
assuming one router is in Chicago, and the other in
NYC. Can I do that within the vicinity of my house?
Or am i reaching? I was thinking, just assign them to
different subnets, and basically that is that. But we
have to deal iwth accesslists, protocols, and the
frame relay simulation, right?
You can connect the serial interfaces back to back with db60 DTE/DCE cables.
You can configure the 2514 as a frame switch to simulate the frame cloud.
This is more fun with a router with more serial interfaces like a 2520 or a
2521 but you can do a lot with what you have now. I would recommend the
CCIE Lab Study Guide to get you started right. It has dozens of relatively
easy labs, many of which can be done with the routers you have now.
Dave Swink
Thanks, and Id really appreciated comments on this. A
lot of newbies are in the same boat....
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