I was hoping to get some feedback on a concern that I have.
We are shopping for Internent & Site to Site services.
I am finding that alot of ISPs want to sell us the two services through a single device. IT's basicly two different ports on their switch. IE, they have the internet connection and the point to point connection VLANed through their switch.
I am a little concerned about that. No matter what they do on our site, they could be mixing our VLAN with someone elses. Plus, I believe there are layer 2 attack that could circumvent the VLAN security.
For example, if they gave to customers the same VLAN ID, it would be transparent to us, but we would actually be able to pick up on eachother packets if we used the wrong IP Addresses.
I am particularly concerned about it because they are mixing (what is supposed to be) a private service and a public service.
So, I have the following questions...
Is this becoming common?
Should I be concerned about it?
What is the rational for it?
Maybe it's no different that other multiplexing technologies?
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