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Route the communication flow

I have an Ethernet network with a machine running Windows 2000 and IIS 5.0 to provide an intranet site. I have no problems with local machines accessing the site. However, I have a DSL modem/router provided by my ISP that supplies a second router that connects to the internal network. Remote access has been possible at certain times but is not reliable. Is there a utility or other software where I can trace ping what is happening? I am also curious if both routers are performing NAT if this is causing the problem.
You can use the "ping" command on your command prompt to verify you connection to the remote host. You can use the "tracert" command at your command prompt to study the route the communication flows. The "tracert" command is useful because you can see where the communication ends at when you cannot connect to a remote host. You can also use the "show ip nat translations" on your Cisco routers to make sure that NAT is working properly.

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