Device and Interface Naming Scheme

Instead of the conventional ‘ethX’ and ‘wlanX’ device naming scheme, devices are named after their security model and type.

This was not done to make it easier for humans, but for more efficient firewall rules, as we noted during testing that various firewall rules and classifiers using the default naming scheme cut performance by as much as 75%, and by default, about 11%. This naming scheme allows for pattern matching (‘+’ syntax) on the devices, and also clearly identifies when different radios are in use.

By breaking up the interface names into different classes, based on function and type, we gain (theoretically, this work isn’t completed) efficiency in classification and firewalling not possible otherwise.

Also, as 2.4ghz radios, 5.x ghz radios and GigE ethernet have very different characteristics, this system lets each be played with individually.

Lastly, the ‘guest’ concept lets encrypted, unencrypted, and mesh networks be tested individually. Etc. See also: default network numbering.

The device naming pattern is

{g|s|d|}{e|w}{radio}{device number}

g = guest or gateway
s = secure
d = dmz

e = ethernet
w = wireless

The device and firewall mapping for the unfamiliar is:


old name new name old zone new zone IP range Why eth1 ge00 wan wan DHCP Default gateway eth0 se00 lan lan 172.30.42.0/27 First lan interface wlan0 sw00 N/A(bridged) lan 172.30.42.6427 First 2.4 ghz wireless interface wlan3 sw10 N/A(bridged) lan 172.30.42.9627 First 5.x ghz wireless interface wlan1 gw00 N/A guest 172.30.42.12827 Second (guest) 2.4 ghz wireless interface wlan4 gw10 N/A guest 172.30.42.16027 Second (guest) 5.x ghz wireless interface wlan5 gw11 N/A guest 172.30.42.19227 Third (mesh) 5.x ghz wireless interface wlan2 gw01 N/A guest 172.30.42.19227 Third (mesh) 2.4 ghz wireless interface


Vlans, although they work, are not currently mapped into this naming scheme.

See also:

Default network numbering scheme
Changing IP, DNS, and SSID
Automated Configuration of CeroWrt

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