VLAN and SDN index/bridge index number questions - how are they decided?

[i0ntempest]

Hi,
I have a BE88U with merlin 3006.102 and I have created a guest VLAN with DHCP. The system assigned it SDN index 5 (as I have `dnsmasq-5.conf`) and bridge device `br56`. I would like some clarifications on how these numbers are decided so I can write reliable scripts to operate on this interface. The goal is to add a IPv6 GUA /64 prefix to this interface so my guests are served IPv6.

Thanks in advance.

 

[dave14305]

If you look at the code, it just picks the next free number, starting from 1 for index, or 52 for VLAN ID. Search for all the get_new_ functions.

https://github.com/RMerl/asuswrt-me...ter/www/sysdep/FUNCTION/SDN/SDN/sdn.js#L10924

Use the get_mtlan command to see what is already defined on your router.