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Posted on 2007-08-01
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Hi,
I would like to know on vlsm how come 172.24.56.2/23 can ping 172.24.56.1/22? It seems that they are on 2 different subnets although they are running vlsm. From my understanding, 172.24.56.1 is the parent network. Thus can 172.24.58.1 ping 172.24.56.1/22? Thanks.
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Question by:cwtang
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amoldkelkar earned 2000 total points
ID: 19608572
Hi,
The major network address for both the ips 172.24.56.1/22 and 172.24.56.2/23 remains the same as in 172.24.56.0

For answering your next question of whether if 172.24.58.1 can ping 172.24.56.1/22 i need to know the subnet mask for 172.24.58.1/???

Assuming if its,
subnet mask = 22 then still the major network address remains the same as 172.24.56.0
where ping will work

But if subnet mask = 23 then the major network address for 172.24.58.1/23 is 172.24.58.0
wherein ping will not work

Let me know if it answers your query?

Thanks
-AK
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Author Comment

by:cwtang
ID: 19608835
Hi,
Silly of me, overlooked on such simple ip fundamentals. Was looking alot on cisco vlsm and their diagrams which i overlooked on simple subnet/network calculations!

Thank you for reminding/refreshing my memory.
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Expert Comment

by:amoldkelkar
ID: 19608850
:-)
Thanks a bunch
Also special thanks for giving me a chance to refresh my own subnetting skills :-)

-AK
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