define internal network subnet

[rji479]

hi. i have a utm1 with splat pro.

I have been allocated 3 x 24 bit ranges of 10.10.70.0/24 / 10.10.71.0/24 and 10.10.72.0/24 for the internal network. These 3 subnets will be evenly divided into 3 vlans.

When i attempted to define the internal network in smartdashboard as 10.10.70.0/22, it will only let me define it as 10.10.68.0/22. I can only use the 3 subnets i have been allocated, as this is a shared service network interacting with other networks so we cannot just choose our own internal range.

So i need to define these 3 subnets as my internal network within checkpoint, how can i achieve this?

thanks

[MarioL]

You can't supernet 3 class Cs, you need 4 contiguous ones for that (and with the right numbers too). Here are your options:

- If you can do it with only 2, supernet 2 of them (10.10.70.0/23)
- Try to get 4 and get them starting at 68, 72, 76, etc... then you can use a /22 netmask
- You can use them all with /24 masks. In this case you can use an internal router to route between them (L3 switch or something), or you can define sub interfaces on the firewall, 1 per range.