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Port Forwarding Nat Criticism Problem Devices Local Network

Front NAT: Criticism (3)
Back Problem: Devices in the local network can not be addressed from the outside

Solutions:
- Static port forwarding (set by the administrator)
- UPnP (Universal Plug and Play) IGD (Internet Gateway Device):

Method for automatically configuring port forwarding
- Relaying: Connection takes place via relay server, which acts as a bridge between the hosts.

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