NAT, Firewalls and Video Conferencing

Bottom Line: Firewalls perform NAT. NAT and video conferencing standard protocols were initially incompatible. Solutions arose and exist for video conferencing to work through firewalls that perform NAT.  Some solutions include advanced firewall capabilities, some involve systems installed in DMZ networks, some include all of the above. As usual in IT and networking technology, implementations of standards across vendors may vary, and feature compatibility and performance impact should be thoroughly analyzed. NAT Origins As covered in a previous post, RFC 1918 was released even before Network Address Translation was a mature technology. However, the need for entire enterprises with hundreds...

RFC 1918

The Internet Engineering Task Force (IETF) sets many of the policies related to the Internet and communication via the Internet Protocol. IETF standards are published as “Request For Comments” or “RFCs.” RFC 1918 sought to address the eventual exhaustion of IP addresses, which we have since experienced. It introduced and standardized the concept of “private” and “globally unique” IP addresses. RFC 1918 defined the following ranges as “private IP addresses:” 10.0.0.0 – 10.255.255.255 (10/8 prefix) 172.16.0.0 – 172.31.255.255 (172.16/12 prefix) 192.168.0.0 – 192.168.255.255 (192.168/16 prefix) That is, it determined that any address within these ranges would not be routable on...