Announcement Technologies FreePBX (Asterisk) Server NIC Layout
This article addresses the numbering of each network interface on an Announcement Technologies FreePBX (Asterisk) server, often provided as part of a Telos VX system.
Any information provided here regarding "Asterisk" or "FreePBX" servers refers only to Telos-commissioned FreePBX (Asterisk) servers used with Telos Alliance telephony products. While these are third-party servers and software, we are able to provide limited pointers and advice (like this article) under normal support.
Network interface layout
The Announcement Technologies FreePBX (Asterisk) servers come with either four or six network interfaces. A common question is "how are the network interfaces numbered?"
There are four network interfaces on the motherboard, clustered in a 2x2 grid, numbered eth0 - eth3.
Optionally, if ordered, there are two additional network interfaces on a PCIe NIC, eth4 - eth5.
This illustrates the layout of the network interfaces as viewed from the rear of the server: