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I have a subnet/vlan which is almost full I want to expand it basically my layout currently is below:

VLAN ID Useable IP Range Network Mask

10 192.168.1.1 to 192.168.1.14 255.255.255.240

20 192.168.1.17 to 192.168.1.30 255.255.255.240

30 192.168.1.33 to 192.168.1.62 255.255.255.224 - need to expand as full

40 192.168.1.65 to 192.168.1.78 255.255.255.240

50 192.168.1.81 to 192.168.1.94 255.255.255.240

60 192.168.1.97 to 192.168.1.110 255.255.255.240

70 192.168.1.113 to 192.168.1.126 255.255.255.240

90 192.168.1.145 to 192.168.1.158 255.255.255.240

Spare 192.168.1.160 to 192.168.1.175 255.255.255.240

Spare 192.168.1.177 to 192.168.1.190 255.255.255.240

VLAN 30 is the one I am running out of space. thankfully vlan 40 and 50 which is right after that is assigned but very few host and i can easily change their ips.

So my new plan is to expand vlan 30 to a /26 from /27

VLAN ID Useable IP Range Network Mask

10 192.168.1.1 to 192.168.1.14 255.255.255.240

20 192.168.1.17 to 192.168.1.30 255.255.255.240

30 192.168.1.33 to 192.168.1.93 255.255.255.192 -expand and change mask

60 192.168.1.97 to 192.168.1.110 255.255.255.240

70 192.168.1.113 to 192.168.1.126 255.255.255.240

80 192.168.1.129 to 192.168.1.142 255.255.255.240

90 192.168.1.145 to 192.168.1.158 255.255.255.240

40 192.168.1.160 to 192.168.1.175 255.255.255.240

50 192.168.1.177 to 192.168.1.190 255.255.255.240

so will it work for the above reconfig? Thanks

Cheers

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drw, are you actually using this IP range? If so is there a reason why you are stifling what addresses you use from this private network range? Just curious. –  dc5553 Apr 28 '12 at 13:24

1 Answer 1

No, it won't work, you have to steal from vlan 10 and 20.

192.168.1.33/27 aka 192.168.1.33 255.255.255.224 ( not the 240 you mention ) allows the ip range you showed.

192.168.1.33/26 aka 192.168.1.33/255.255.255.192 your usable range would be 192.168.1.1 - 192.168.1.62

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