[Ilugc] IP address and netmask
- From: suraj@xxxxxxxxxxxxx (Suraj Kumar)
- Date: Sat, 16 Jun 2012 12:21:32 +0530
On Tue, Jun 12, 2012 at 11:51 AM, Manokaran K <manokaran at gmail.com> wrote:
On Tue, Jun 12, 2012 at 11:23 AM, Suraj Kumar <suraj at careergear.in> wrote:
On Sat, Jun 9, 2012 at 2:22 PM, Girish Venkatachalam <
girishvenkatachalam at gmail.com> wrote:
We should learn 3 special network blocks , 10.0.0.0/8, 172.16.0.0/12
and 192.168.0.0/16 which
are not globally unique.
This is not technically mandatory anymore. CIDR replaced the class-based
network addressing scheme a long time ago.
AFAIK, CIDR only dispenses with the need to have rigid network address
space and make it network admin definable for his/her convenience. The pvt
network blocks still exist and packets meant for it are not allowed to
enter the internet.
Or am I wrong?
You are right. classful addressing still exists in various parts of the
Internet. CIDR is technically backwards compatible and hence allows this to
exist. Hence I used the phrase "this is not *technically mandatory*
anymore" (ie., the choice is upto you to implement CIDR / classful
routing).
This can be compared to IPv4 vs IPv6: even if IPv6 becomes widely used, it
may still help to learn about "our history" by knowing about IPv4. Yet, if
one is expected to setup a network, it would be short-sighted/foolish to
setup an IPv4-only network.
This is all I wanted to point out.
cheers,
-Suraj
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