On 06Oct2018 10:30, Ed Greshko <ed.gres...@greshko.com> wrote:
On 10/6/18 8:38 AM, Ranjan Maitra wrote:
My monthly quota is 400GB. However, do I need to go all through the network? At 
the very least, should I not be able to go through the router and back without 
actually using the network?

They are on the same local network?

Yes, the data will not leave the local network and add to your quota.

To make double sure of that just use "ip addr show" on both systems.  I'm 
guessing they'll
have addresses
such as "192.168.1.X".

What Ed said.

In case it isn't clear, your "quota" is presumably your monthly data quota with you ISP. That applies _only_ to data sent/received via the ISP i.e. the network _outside_ your home.

Your ISP never sees anything internal.

Your home network probably looks like this:

 INTERNET--modem--switch--laptop

Often the switch is part of the modem rather than a distinct box, and often there's wifi on the modem too.

Only traffic to/from the internet counts towards your quota.

So, keeping all the traffic on your internal network, we ignore the internet and the modem:

 switch--laptop

With both your laptops:

 laptop--switch--laptop

or the "crossover cable" scenario:

 laptop--laptop

In both these situations your laptops should be on the same IP network, and traffic will remain local.

Cheers,
Cameron Simpson <c...@cskk.id.au>
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