Monday, March 11, 2019

How do private networks work together without colliding?

Hopefully I've shown enough of an educational effort that I'll make it through the rules! I'm a trainee network engineer and I'm finding myself asking lots and lots of questions, however sometimes the explanations I get from my senior colleagues are complex and in-depth (perhaps they forget I've been doing networking for a fraction of time some of them have). I wondered if I could ask something that is really bothering me, hopefully that I will understand it?

Let's take a company's private IP addressing (10.250.0.0 - 10.253.0.0/8). If this is what my company chose to address their internal network, and they allow access to another organisation (Say a council or university network who has staff working in my organisation's premises, and need to access their own network), then how do the two networks tell each other apart? If they are both inside 10.0.0.0 /8 private addressing, I'm just really confused as to how the networks are separated?

Can this be done by separating the traffic into a particular vlan? Or would there need to be something else in place too?

Perhaps I'm overthinking it, or getting confused over nothing. I have the scenario in my head, I'm hoping I've written enough to understand where I'm coming from with my confusion. Thanks guys!



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