use reserved network as privat network

[Romandm]

houston we have a problem =)

hello everyone!

The company whare I work for bought 2 companies and we are merging the infrastructure

we have big trouble with overlapping ip-address space, we cant use any network for rfc1918 

what do you think if use 198.18.0.0/15 or 100.64.0.0/10

they are not used in the global network

https://lg.he.net/

https://en.wikipedia.org/wiki/Reserved_IP_addresses

[balaji.bandi]

You need to provide more information, how you are merging, what is a high-level network, and where this network each other terminating.

If you have 192.x.x.x is overlapping each other.

you can use in between 172.X.X  or 10.X.X  and do the NAT if you do not have any Public Space address.

[marce1000]

 - I don't recommend it , perhaps not all equipment will support it in the 'expected way' ; in the modern world you have flexible solutions these days with VPN_tulles on 'edge-firewalls' , one of the benefits of that is that you don't have to give  up all trust levels immediately when connecting to the merging-company network.

 M.

[Joseph W. Doherty]

Have you considered double NAT?

[Romandm]

we use AD microsoft, will be one big domain, it is not friendly with NAT

https://support.microsoft.com/en-us/help/978772/description-of-support-boundaries-for-active-directory-over-nat

[balaji.bandi]

I do not see any issue here, MS AD required only reachability, MS AD not have any visibility on the network layer.

Do you have 2 Option :

1. test one of the segments with NAT

2. Deploy another Trusted AD in another network to join the main AD

3. change the IP address space (if you have any concern)

Choice is yours.

[Giovanni Alexander Molina]

Try using NAT while you start a migration plan to the new scope gradually, you can start with networks of some users that use dhcp but adding the permissions and routes to them.

Regards,