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TOPIC: supernetting , (someone's gotta know this..pls help..)

supernetting , (someone's gotta know this..pls help..) 9 years 10 months ago #19487

  • skylimit
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Hi all, anyone able to clarify this for me pls?
Im having problems supernetting this CIDR block given: 235.85.105.64/27 - 235.85.105.128/27

I have to assign 1500+ IP addresses to 1500+ hosts (desktops) in 15 locations.

From what i learnt in the supernetting section of the site. Supernetting means borrowing bits from the network ID, therefore to supernet 235.85.105.64/27 borrowing 3 bits I'll have:

IP: 11101011. 01010101.01101001.01000000
Netmask: 11111111. 11111111. 11111000.00000000
network ID:11101011. 01010101.01101000.00000000 (ANDing)
ie. 235.85.104.0

broadcast: 00000000.00000000.00000111.11111111
ie. 235.85.111.255

i.e: supernet range = 235.85.104.0 - 235.85.111.255 (first supernet)
no of supernets = 2^3 - 2= 6 supernets
hosts on each supernet = 254 (2046 hosts in total)
Am i correct to this point?

Question:
How would i go about calculating the remaining 5 supernets (that is the host range, supernet iD and broadcast?I will be extremely glad to get quick response to this please

Secondly, how can i summarise the supernets (i.e. route summarization) to minimise the size of routing tables in the core.

Many thanks in advance. please help me out im stuck[/b]
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