Question about subnetting...

[jlazzaro]

If I have a 155.74.0.0 address (class b) with a 255.255.255.224 subnet, how would I go about adding more hosts to one subnet and taking away from another?

155.74.64.0 and 155.74.96.0 both support 32 addresses (30 nodes). However, 96.0 ran out, and 64.0 has plenty left over. How would I give some to addresses to 96.0 and take away some from 64.0?

 

[spidey07]

need more information.

generally a single IP subnet is a single layer2 network/broadcast domain like a LAN or VLAN.

Any reason you can't just change the mask?

Because 155.74.64.0 with mask of 255.255.255.224 is indeed only 30 hosts.
But judging from your post (using 155.74.64.0 and 155.74.90.6) this looks like a mask of 255.255.224.0 and would support 31*256 addresses or around 8000 hosts.

 

[bruceb]

Go to this site: http://www.wildpackets.com/products/free_utilities/ipsubnetcalc/overview
Download IPSUBNET CALC ... it's freeware and you will be able to do all sorts of
subnet & host calculations with it

 

[jlazzaro]

sry spidey, gave you some wrong info. The two subnets are actually...

155.78.74.64 (155.78.74.65-94)
and
155.78.74.96 (155.78.97-126)

both with the /27 mask.

96 needs more addresses, so how would I put .64 down to 16 and raise .96 to accomodate to more hosts...

 

[spidey07]

you'd have to shorten the mask to a /26 or shorter.

/26 gives networks - .0, .64, .128, .192.

so you're gonna have to readdress one of the networks.

Are these two separate networks/broadcast domains?