Company acquisition - change network IP scheme?

Our company just purchased three other small companies and i am wondering if I should be considering changing their IP scheme.  At this point there are a handful or two of devices and users so the job is not too bad - its just that the new companies are hours of flying time away.

Each company will be connected to our corporate network using IPSec tunnels.  one of the companies has a 157.x.x.x and the other two are 192.168.6.x and 192.168.0.x

I'm more curious of doing this out of best practices but also i believe in the future we could have a conflict with additional acquisitions.

Any recommendations would be appreciated!
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Zephyr ICTCloud ArchitectCommented:
I would definitely change the 157.x.x.x  one, or is this an external ip of something? If that is an internal ip-scheme I'd definitely change it...

You could keep the others, you even have some room left to expand the subnet if and when needed, when others should arrive in the future you can revisit the setup, if one of these new ones has a range that is in the current ip-scheme you could change that one at the time it presents itself...

Minimum work best outcome ;-)

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Don JohnstonInstructorCommented:
change it now. The longer you wait, the bigger a pain it's going to be.
JohnBusiness Consultant (Owner)Commented:
I agree with the above on the 157. network, and 192.168.0.x is used in consumer routers. So two out of 3 need be changed and accordingly you should proceed while it remains easy (not necessarily convenient) to change.
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