Internet connection redundancy (DSL and 4GLTE)

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

	Hello,

	For a long time (9 months), my DSL connection is unstable. Thus, I have
bought last Saturday a 4G Ethernet modem. Now, my WAN connection is :

wm2 (192.168.15.14)
  +---- DSL modem (Archer VR400, 192.168.15.20)
  +---- 4G modem (TL-MR6400, 192.168.15.19)

	Now, I'm trying to automatically change default route (from
192.168.15.20 to 192.168.15.19 and reciprocally) when DSL connection is
down.

	Is there a mechanism to do this with NetBSD ?

	Best regards,

	JKB