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General discussion

Thought I knew how non-routable network addresses

by mjs1138 Mar 19, 2006 9:09AM PST

Hi. I thought I knew how non-routable (nr.) network addresses function but maybe I don?t. Either that or maybe my firewall/router doesn?t work right. Or ?? Anyway, the other night I ping-ed the nr. address 192.168.0.1 and received a response back. As this was not my LAN network address I was surprised to see that. I then performed a tracert on the address and received information that clearly takes me out through my ISP routers? My LAN addresses are all 192.168.1.x, with a subnet mask of 255.255.255.0. The router serves as the DHCP server. DNS servers listed in router configuration are the ISPs. Any one have a idea of how/why this happens?

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4 Posts
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Network Address
by Darton Fury Mar 20, 2006 2:23AM PST

Everything is working properly. The router has a public IP address and assigns private IP addresses to everything on your network. This guarantees that your private info never gets into the public arena accidentally. The router/default gateway is acting as a DHCP server. The 192.168.0.1 address is the address automatically assigned to a computer with internet connection (ICS) sharing enabled. Name resolution is handled by your ISP's domain name system servers.

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"Private?" address?
by mjs1138 Mar 20, 2006 7:10AM PST

But why is a "private" IP address (192.168.0.1) being forwarded? My understanding was that these addresses would be blocked by a router? --- Mike

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Addresses
by Kono Kusotare Mar 20, 2006 9:34AM PST

The devices on your network all have private IP addresses. When an internal device (your computers) makes a request to communicate with the internet (ping, pathping, tracert) the client computer forwards the request to the router which communicates directly with the internet resource and then gives the retrieved info to the client computer. The router doesnt block IP addresses. It simply acts as a middleman between the internal client and the internet resource.

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Private IP addresses on the internet
by mjs1138 Mar 21, 2006 8:01AM PST

OK. But it was my understanding that internet routers would not rout "private" IP addresses. In this case 192.168.0.1. Should I contact my ISP? --- Mike

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