IP subnet

[KarandeepChana]

Hi,

Can someone please help me with subnetting?

I need to customize 10.0.0.0/8 to not include 10.3.0.0/16.

thanks

[chrihussey]

The question is very vague, could you elaborate? What are you trying to accomplish?

[KarandeepChana]

Hi Chrihussey,

Thanks for your reply.

Basically, 10.0.0.0/8 range is being used by Google Cloud Platform for pods communication and our IP range (10.3.0.0/16) is within this range , so we are not able to access our on-promises services from google cloud platform over vpn tunnel as it's not getting masqueraded at gcp. In order to make this working we need to exclude our IP range from that in ip masquerading agent config at gcp.

By default 10.0.0.0/8 is configured as nonmasguraded within gcp in order to make communication between pods.

Thanks

[paul driver]

Hello
The subneting is below however may I ask is this for some sort of route advertisement or summerisation as you can negate the advertisement of certain routes/prefixes is you need to with the routing process?

What you see below is the 10.0.0.0/8 has been split into two /9 networks and than the /9 network that includes teh 10.3.0.0/16 is split and advertised until any thing below 10.3.0.0/16 is excluded.

10.128.0.0/9
10.64.0.0/10
10.32.0.0/11
10.16.0.0/12
10.8.0.0/13
10.4.0.0/14
10.0.0.0/15

10.0.0.0/8

                       10.0.0.0/9        |       10.128.0.0/9            

            10.0.0.0/10    |   10.64.0.0/10

              10.0.0.0/12   |  10.32.0.0/11

         10.0.0.0/12 | 10.16.0.0/12

         10.0.0.0/13  | 10.8.0.0/13

       10.0.0.0/14 | 10.4.0.0/14

10.0.0.0/15

res

Paul

[KarandeepChana]

Thanks Paul