Firewalls and NATs

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RTC client applications can encounter a Network Address Translator (NAT) or a firewall in the call path.

Firewalls and NATs are applications placed on the gateway to the Internet and protect devices on an internal network:

  • A NAT maps one or more internal devices using internal IP addresses to a single external IP address.
  • A firewall blocks certain kinds of incoming traffic.
  • As of Windows CE, RTC 1.5 removed support for UPnP-based NATs. Instead, it enhanced its port manager APIs and also added support for symmetric UDP/TCP for better traversal of NATs.

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Using the RTC Client API