Legacy Open Mesh: What IP Address Space Does NG Use and How Does It Avoid IP Conflicts?

Follow

Question

What IP address space does NG use, and how does it avoid IP conflicts?

Environment

  • CloudTrax

Answer

Each node in a network potentially can become a gateway and start distributing IP addresses via DHCP on all active SSIDs (only gateways run a DHCP server). To avoid IP address collisions from the numerous gateways a network can have the dashboard has to send each node an identifier (so-called 'node id') from which firmware-ng will derive its unique (collision free) IP address space.

Firmware-ng divides the available 32Bit IP address space as follows:

<8Bit Class A net><14Bit network><10Bit host>

The 10Bit host part allow a maximum of 1024 simultaneous clients per SSID per gateway.

An example with a node id of '1':

SSID#1: 10.255.240.1/22
SSID#2: 10.255.236.1/22

As shown firmware-ng will start with the highest bits counting downwards to avoid IP collisions with the LAN as well. To further reduce the likelihood of LAN IP collisions firmware-ng gateways will compare their IP address space with the LAN's address space and can change to the 172.16.x.x address space in case of a collision.


Was this article helpful?

0 out of 0 found this helpful

You must sign in before voting on this article.

Want to talk about it? Have a feature request?

Head on over to our Datto Community Forum or the Datto Community Online.

For more Business Management resources, see the Datto RMM Online Help and the Autotask PSA Online Help .

Still have questions? Get live help.

Datto Homepage