Can I subnet my network like this ?

[Supote Leelasupphakorn]

Hi, all

   I would like to verify my knowledge
by building the network like below but not
sure whether it's impossible for subnetting
like this - say, from Gateway no2, is divided
to 172.16.0.0/16 and 172.17.0.0/16 subnet.

   I heard that it isn't recommend or
impossible (not sure again) to use FIRST or
LAST subnet in the allocated IP address pool,
is it?

  Section no.1 is existed and I own the Gateway no.2.
My plan is enable NAT on it by following the
instruction in FreeBSD handbook. Any comments are
welcome.

          
       |
       | if_1 = 202.xx.xx.xx
  |---------------|                        |
  | Gateway no.1  |                        | section 1
  |---------------|                        |
       | if_2 = 10.0.0.1                   |
       |                                 ----
       |                                   |
       | if_1 = 10.0.0.254                 |
  |---------------| if_2 = 172.16.0.1/16   | section 2
  | Gateway no.2  |----------------        |
  |---------------|                        |
       | if_3 = 172.17.0.1/16              |
       |                                   |


Thanks in advance,


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