The internet backbone routers don't locate anything. They accept a packet on port X from address number xxx.xxx.xxx.xxx and look up in their routing tables to see which port they need to forward the packet to to get it to its destination address yyy.yyy.yyy.yyy. It so happens that most of these internet backbone routers are configured to, if they see some of these reserved addresses (the 192.168 ranges, for example, to bring this back to Ray's question) as a destination address, drop these packets. It has nothing to do with DNS, which is the process (or server) which translate an English-readable Fully Qualified Domain Name to a numeric IP address. By the time the backbone routers get a hold of a packet the DNS process is long since completed, usually by the originating machine. At least the last time I checked... Glenn Sullivan, MCSE+I MCDBA David Clark Company Inc. -----Original Message----- From: Jeff Stockard [mailto:JStockard@xxxxxxxxxxxxxxx] Sent: Monday, November 18, 2002 12:49 PM To: windows2000@xxxxxxxxxxxxx Subject: [windows2000] Re: 192.168.*.* - why? The Internet backbone routers use DNS to locate addresses. 10.x.x.x address are ignored by the Internet backbone routers. For this reason many companies use this address scheme in their private networks. =20 -----Original Message----- From: Sullivan, Glenn [mailto:GSullivan@xxxxxxxxxxxxxx]=20 Sent: Monday, November 18, 2002 12:46 PM To: windows2000@xxxxxxxxxxxxx Subject: [windows2000] Re: 192.168.*.* - why? OK, but what does that have to do with DNS? They don't mention DNS in that blurb. Glenn Sullivan, MCSE+I MCDBA David Clark Company Inc. -----Original Message----- From: Jeff Stockard [mailto:JStockard@xxxxxxxxxxxxxxx] Sent: Monday, November 18, 2002 12:30 PM To: windows2000@xxxxxxxxxxxxx Subject: [windows2000] Re: 192.168.*.* - why? From this site on IP addresses: http://www.oreilly.com/catalog/coreprot/chapter/appb.html Where it says "there are groups of "private" Internet addresses that can be used on internal networks by anyone. These address pools were set aside in RFC 1918, and therefore cannot be "assigned" to any organization. The Internet's backbone routers are configured explicitly not to route packets with these addresses, so they are completely useless outside of an organization's internal network. The address blocks available are listed in Table B-4." Any addresses in 10.x.x.x -----Original Message----- From: Daniel Ensor [mailto:densor@xxxxxxxxx]=3D20 Sent: Monday, November 18, 2002 11:59 AM To: windows2000@xxxxxxxxxxxxx Subject: [windows2000] Re: 192.168.*.* - why? Dark N' snowy?? -----Original Message----- From: Robert Funderburk [mailto:robfunderburk@xxxxxxxxxxx] Sent: Monday, November 18, 2002 4:54 PM To: windows2000@xxxxxxxxxxxxx Subject: [windows2000] Re: 192.168.*.* - why? What are you talking about with "outside DNS" ? ----- Original Message ----- From: "Jeff Stockard" <JStockard@xxxxxxxxxxxxxxx> To: <windows2000@xxxxxxxxxxxxx> Sent: Monday, November 18, 2002 10:52 AM Subject: [windows2000] Re: 192.168.*.* - why? > > That was my point. They don't have anything to do with outside DNS. If > you used an address that was in the outside DNS range, you would be > continually looking to the DNS table to find other PC's on your network. > > -----Original Message----- > From: Sullivan, Glenn [mailto:GSullivan@xxxxxxxxxxxxxx]=3D3D20 > Sent: Monday, November 18, 2002 9:20 AM > To: windows2000@xxxxxxxxxxxxx > Subject: [windows2000] Re: 192.168.*.* - why? > > > <----------Snip--------> > Companies use theses schemes so their requests for data will not look to > the > outside DNS list. This makes the lookup a little faster, when you can > skip > the rest of the entire Internet and just look on your Intranet. > <----------Snip--------> > > What do you mean? These reserved address ranges really don't have > anything > to do with DNS, to my knowledge. > > A little confused I guess. That's what happens when you wake up with > three > inches of ice covering everything... > > Glenn Sullivan, MCSE+I MCDBA > David Clark Company Inc. > > > -----Original Message----- > From: Jeff Stockard [mailto:JStockard@xxxxxxxxxxxxxxx] > Sent: Monday, November 18, 2002 9:12 AM > To: windows2000@xxxxxxxxxxxxx > Subject: [windows2000] Re: 192.168.*.* - why? > > > > They are non routable. The same is true with 10.x.x.x. Companies use > theses schemes so their requests for data will not look to the outside > DNS list. This makes the lookup a little faster, when you can skip the > rest of the entire Internet and just look on your Intranet. > Hope this helps > Jeff > Jesus Loves You > > -----Original Message----- > From: Costanzo, Ray [mailto:rcostanzo@xxxxxxxxxxx]=3D3D3D20 > Sent: Monday, November 18, 2002 8:59 AM > To: windows2000@xxxxxxxxxxxxx > Subject: [windows2000] 192.168.*.* - why? > > > Hi list, > > I'm just curious about something. It seems that most networks use > 192.168.*.* for their internal addresses. Why? It doesn't really > matter, does it? Isn't 192.168.*.* completely arbitrary? My theory on > how this came to be the norm is that MS used those addresses in some > samples in some books or something, and people started using that and it > just became the norm. But then there's that whole Internet connection > sharing feature that came out in what, W98SE? With that, the computer > that's sharing its Internet connection will be 192.168.1.1. So, I > imagine that it's coded somewhere into other OS'es to look to see if > 192.168.1.1 can be used as a gateway when the user does not specify an > IP configuration. So what came first? 192.168.*.* or computers looking > to 192.168.1.1 as a gateway? Or what my real question is is why > 192.168.*.*? > > Thanks, > > Ray at work > > > ********************************************************************** > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. 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