On Monday 25 Aug 2008, Kenneth Gonsalves wrote:
> On 25-Aug-08, at 10:24 AM, Arun Khan wrote:
> >> is this a convention or a rule?
> >
> > It is a rule. In general, the IPv4_number/no_of_bits defines the
> > network id. The remainder bits define the "no of hosts" possible
> > in that network. All 0s in "host field" reserved for the network
> > and all 1s in "host field" reserved for broadcast.
> >
> > For example a.b.c.d/24 defines a 24 bit mask, a.b.c.0 is the
> > network id
> > and a.b.c.255 is the broadcast.
>
> so what happens if I give 192.168.1.0 as the ip for a machine on a
> lan (have been doing this for 10 years or more so far)?
How many systems do you have in your network?
I conducted a small experiment with 3 physically different systems in my
LAN:
system A: ip no. 192.168.1.0 and 192.168.1.255 (original 192.168.1.68)
system B: ip no. 192.168.1.232/24
system C: ip no. 192.168.1.7 (print server)
When system A is set to 192.168.1.0 or 192.168.1.255:
On system A ping -c5 192.168.1.0 or 192.168.1.255 insists on -b
option. With -b option ping returns message from self.
On system B ping -c5 192.168.1.0 or 192.168.1.255 insists on -b
option when added returns message from system C.
On system B "ssh [EMAIL PROTECTED]" or "ssh [EMAIL PROTECTED]"
returns "host not reachable" IMO, this establishes that .0 and .255
are reserved numbers i.e. not to be assigned to any host.
system A: ip no. 192.168.1.68 (the original ip no. restored)
system B: ping -c5 192.168.1.68 works!
ssh [EMAIL PROTECTED] works! I can login into my .68
machine!
If you have > 1 physical machine in your network you can do the above
and see for yourself.
Hope the above answers your question.
--
Arun Khan
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