01-23-2013 01:17 AM - edited 03-07-2019 11:15 AM
Hi,
I have been given an external range, say 1.1.1.168/29 giving me usable or 1.1.1.169-174, so 6 useable IPs, although one will be used for the gateway, so really only 5 (or 4 as below).
I am trying to split this up into 2 separate Vlans on a Cisco 1921. so that each VLAN can have at least useable 2 IPs (excluding the gateway).
How can I do this or is it even possible? or would I simply need a bigger range to do it?
Can i somehow have x.x.x.169 170-171 and then x.x.x.172 173-174 for the other?
01-23-2013 02:16 AM
Hi Robert
You can split your /29 in two /30
x.x.x.168/29 ---> x.x.x.168/30 & x.x.x.172/30
VLAN A x.x.x.168/30
x.x.x.168 = Subnet
x.x.x.169 = Usable IP
x.x.x 170 = Usable IP
x.x.x 171 = Broadcast
VLAN B x.x.x.172/30
x.x.x.172 = Subnet
x.x.x.173 = Usable IP
x.x.x.174 = Usable IP
x.x.x.175 = Broadcast
So you will have 2 IPs per subnet, one for the router, 1 for a client - if you need two client-IPs per subnet you need a bigger range.
HTH
01-24-2013 04:27 AM
Hi Marcel,
Yes this is what I thought. I need at least 2 client IPs, so have had to get a bigger range.
Thanks
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