[Ilugc] tataindicom usb modem with mandriva2008.1
- From: knura@xxxxxxxxx (Arun Khan)
- Date: Sun Aug 24 20:32:19 2008
On Sunday 24 Aug 2008, Girish Venkatachalam wrote:
On 10:20:52 Aug 24, Arun Khan wrote:
^^^^^^^^^^^^
For Class C address space c1.c2.c3.0 and c1.c2.c3.255 are reserved
for the network number and broadcast number respectively. They are
not supposed to be used as host ip numbers.
Classes are passe. Gone forever from the face of Internet.
So are the RFCs on network classes obseleted?
Today it is CIDR.
True, but still you cannot randomly pick IP blocks for assignments
within your network. Contiguous blocks are split or consolidated with
sub/super netting.
You could have an IP 192.168.0.1 but not an IP that ends in .0 like
192.168.1.0 since both 192.168.1.255 and 192.168.1.0 are used for
broadcast.
Even in CIDR, all 0s in "host bits" identifies the network (e.g. .0
for /24) and all 1s in "host bits" is the broadcast (e.g. .255
for /24). For routing table entries I (and have seen others) use .0
for network and not .255. Maybe for ping purpose .0 and .255
tantamount to broadcast?
--
Arun Khan
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