06-05-2019 07:00 AM
Hello, this is probably not a good question and not possible but thought I'd still ask.
I've got a /26 network and I have a decent amount of IP's that I don't use. I am wanting to setup a test environment with a /29 subnet. If I was to take a group of 8 IP's x.x.x.112-.119 can I subnet that off and then setup a router with the ip of vlan x of x.x.x.111/26 and then vlan xx the ip of x.x.x.113/29 and then do a default route of 0.0.0.0 0.0.0.0 x.x.x.65?
I am not using the IP's x.x.x.111-.119
Thanks
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06-05-2019 07:17 AM
Hello maniac79,
overlapping addresses /subnets are not supported.
You can take your /26 subnet and you can further make subnets of it, but you cannot keep the original configuration in place.
The first thing you can do is to split the /26 in two /27 subnets.
And then you can use the two subnets in different interfaces / Vlans.
x.x.x. 0 first /26 subnet
x.x.x.64 second /26 subnet
x.x.x.128 third /26 subnet
x.x.x.192 fourth /26 subnet
So you take x.x.x.64/26 and you can get
x.x.x.64/27 first /27 subnet
x.x.x.96/27 second /27 subnet.
>> I am not using the IP's x.x.x.111-.119
This will be on the new second /27 subnet x.x.x.96/27
Note: you need to change addressing on all existing hosts because of the netmask change and all device with IP addresses greater then x.x.x.97 will end in the new second /27 subnet.
x.x.x.65 default gateway for x.x.x.64/27
x.x.x.97 default gateway for x.x.x.96/27
You need to follow the binary math when subnetting
Hope to help
Giuseppe
06-05-2019 07:17 AM
Hello maniac79,
overlapping addresses /subnets are not supported.
You can take your /26 subnet and you can further make subnets of it, but you cannot keep the original configuration in place.
The first thing you can do is to split the /26 in two /27 subnets.
And then you can use the two subnets in different interfaces / Vlans.
x.x.x. 0 first /26 subnet
x.x.x.64 second /26 subnet
x.x.x.128 third /26 subnet
x.x.x.192 fourth /26 subnet
So you take x.x.x.64/26 and you can get
x.x.x.64/27 first /27 subnet
x.x.x.96/27 second /27 subnet.
>> I am not using the IP's x.x.x.111-.119
This will be on the new second /27 subnet x.x.x.96/27
Note: you need to change addressing on all existing hosts because of the netmask change and all device with IP addresses greater then x.x.x.97 will end in the new second /27 subnet.
x.x.x.65 default gateway for x.x.x.64/27
x.x.x.97 default gateway for x.x.x.96/27
You need to follow the binary math when subnetting
Hope to help
Giuseppe
06-05-2019 11:06 AM
Hi my friend,
You can take as a reference to divide the network / 26 the following:
Need | Stand | CIDR | Mask | ID | Range | Broadcast |
14 | 16 | /28 | 255.255.255.240 | 192.168.1.64 | 192.168.1.65 - 192.168.1.78 | 192.168.1.79 |
13 | 16 | /28 | 255.255.255.240 | 192.168.1.80 | 192.168.1.81 - 192.168.1.94 | 192.168.1.95 |
10 | 16 | /28 | 255.255.255.240 | 192.168.1.96 | 192.168.1.97 - 192.168.1.110 | 192.168.1.111 |
7 | 16 | /28 | 255.255.255.240 | 192.168.1.112 | 192.168.1.113 - 192.168.1.126 | 192.168.1.127 |
Note that the division process must be initiated by the largest network to reach the smallest in your case you have / 26 with 64 host for that reason must be smaller networks.
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