I believe you can do that, if you enable subnet zero, and there won't be any
address conflict because the subnet masks are different. But, you will not
get the number of subnets and hosts that you have specified. This is because
each time you subnet, you use up one address from the block you are
subnetting from - hierachical thing.
I would personally reserve bits from the assigned prefix block, and use
those reserved addresses for further subnetting. That way you will not get
into the pitfall where a network address is also a host address.
CM
-----Original Message-----
From: Oletu Hosea Godswill, CCNA.
To: [EMAIL PROTECTED]
Sent: 19/06/01 07:52
Subject: Please Help with VLSM [7:9024]
Hi group,
Please just throw more light of this. If I have a block of ip address,
can I
use different subnets for different purposes like this:
If my block is 216.73.203.0
1. 216.73.203.0/26 ---- 4 Networks, 64 Hosts each
2. 216.73.203.0/27 ------ 8 Networks, 32 Hosts each
3. 216.73.203.0/28 ------ 16 Networks, 16 Hosts each
4. 216.73.203.0/29 ------ 32 Networks, 8 Hosts each
5. 216.73.203.0/30 ------ 64 Networks, 4 Hosts each.
My desire is to use the item 5 for all my WAN links since it only have 2
valid
hosts per network and the rest for other purposes.
But my problem is if I have use two same IP-addresses but from different
networks (eg one from item 3 and the other from item 4 above) assigned
to two
different hosts on both ends of a routable network, wouldn't the system
response with a conflict/duplication of IP-addresses or give some other
kind
of error?
Eg If, I have this scenerio:
Host A = 216.73.203.21 255.255.255.248 (ie a host on network
216.73.203.16/29)
Host B = 216.73.203.21 255.255.255.252 (ie another host on network
216.73.203.20/30)
Questions:
Since both hosts are on both sides of a routable network:
1. Wouldn't there be an IP-address conflict?
2. Wouldn't it be a duplication of IP-address?
3. If I ping 216.72.207.21, which of the two host will reply?
OR
4. Is it that I can only variably subnet a block of IP-addresses once,
say
/29
and use only hosts from that subnet and cannot do another subnetting on
that
same block when the need arises?
These are my questions.
How I wish someone can clear this, for it will help myself and many
other
people in the group.
Rgards.
Oletu
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=9033&t=9024
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