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hows this possible?

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At work we have three sites on different internet connections and yet the three networks can all communicate with each other directly I.e I can ping devices from one site at another

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Posted

You might not have NAT - you might have a range of public facing IP addresses which are given to machines.

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Posted

The chances are they are on a VPN connection that basically makes one large network out of the three smaller networks.

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Posted

VPN, static routes, could be anything without more details.

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Posted

Not understanding what your question is?  Why would you think you could not ping your other company devices?

 

Question for you what is the first 2 octets of your IP your pinging ?.?.x.x  do they start with 10.x.x.x or 192.168.x.x or 172.16-31.x.x

 

You could have point to point connections, you could be connected via mpls cloud, as mentioned could be something as simple as site to site vpns, etc. etc.

 

What is it your confused about?

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Posted

On the 10.x range. I'm just interested in how its done as by default two people on different Internet's can't talk to each other's entire network

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Posted

Its done by magic.....

Seriously though, probably the 3 connections routed to 1 central dhcp then given internal network IP addresses from there...

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"two people on different Internet's can't talk to each other's entire network"

 

There is no real "default" way to connect different locations together as already stated it yes there is some sort of connection between them - but it could be over the public internet via a vpn.  Or it could be a specific point to point connection (not the internet) or could be over a mpls cloud, etc.. where the company routes their locations across this even if they are private address space - since its not the really the internet.  Could be microwave connection between the locations, etc..  The different ways to connect connections is numerous -- there is not really a default way.

 

Still not sure what your asking exactly..

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Posted

I'm guessing your real question is that they are all on three different domains, yet can communicate.  If this is what you meant, they are using trusted domains.

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Posted

My best guess is leased lines between them or VPN's. Give us more information. It could be anything really, Just simple routing would suffice.

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Posted

VPN. They probably have a good firewall at each location that does full site VPN. Otherwise they are purchasing a separate circuit for internal traffic from the ISP or phone company.

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Posted

We do this with 10 different sites. Our ISP routes the traffic over their networks - a reseller of a mish-mash of different ISPs' networks. To us it's all transparent with the ISP-provided routers configured on specific local subnets. We have DHCP and DNS servers at each location so they can all work on their own.

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