Private IP addresses...

[ElKevbo]

Why do some people recommend using 192.168.x.x for internal/private networks instead of 10.x.x.x? Doesn't the latter give you more flexibility in the long run? Or am I hopelessly confused? 🙂

Kevin

 

[FUBAR]

Well, 192.168. gives you ~65000 addresses, and 10. gives you over 16 million. If you really think you need THAT much flexibility...

 

[convex]

192.168.x.x seems to be drilled into all our minds already 😉

 

[xoro]

I think that 192.168.x.x is more efficient, don't ask me how but I think I read somewhere that it is slightly faster than anything else, but mabey I'm just hopelessly confused too 🙂

 

[brewty]

whatever you prefer...
if you don't like remembering too many numbers, then 10.*.*.* is good 🙂
10.0.0.1, 10.0.0.2...
otherwise it doesn't make a difference, as they're all reserved internal ip's and i doubt you're going to have to choose one over the other because you need the extra ip's.

 

[IceStorm]

http://www.faqs.org/rfcs/rfc1918.html

There are three address ranges available for private addresses:

192.168.0.0 to 192.168.255.0 - 256 Class C networks of 2^8 - 2 hosts
172.16.0.0 to 172.31.0.0 - 16 Class B networks of 2^16 - 2 hosts
10.0.0.0 - 1 Class A network of 2^24 - 2 hosts.

Note that the above networks are delineated as they were known pre-CIDR (Classless Inter-Domain Routing). With CIDR, it doesn't matter what your network mask is - you could use all of 192.168.0.0 with a 16bit netmask, if you wanted to, if your routing protocol can operate in a classless manner.

At home, I use 192.168.1.0 for my internal LAN segment, and 10.0.0.0 on the exterior boxes as secondary addresses so I can talk to them without having my conversation "seen" by others on the subnet (at least, not easily). That, and my DSL "modem" has 10.0.0.1 as a management IP, so I can access it without extra hardware.

 

[Spiff]

the info below is from http://www.faqs.org/rfcs/rfc1918.html

Private Address Space

The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:

10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

Use whichever range floats your boat. It doesn't matter

ummm... why would on address be any faster than another. I admit my hardcore internetworking knowledge is lacking, but this makes no sense unless someone can explain it.

 

[Spiff]

hahaha.... I didn't see IceStorm's post before I made mine