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Cyanogen
Beginner

SPAN/Port Mirror across a VPN?

I present to you a challenge... at least for me anyway...
 
Imagine you have a cellular router connected to an L3 switch, and 2 devices behind it at one location.
 
You have a different piece of hardware connected to the internet in another location with a LAN port specifically designed as a sniffer.
 
How would you get these two networks to talk and be able to sniff traffic across a VPN or similar using the (remote) LAN port on the sniffer?

 

Would I need a VPN concentrator on the sniffer's end to consolidate the traffic if using multiple cell routers/VPN connections?

 

See the pathetic excuse for a network diagram below.

 

I appreciate any advice or tips you guys could offer.

 

Cheers,

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