In my case, I want to fail over from VDSL to 4G within a couple seconds of VDSL going down. Will short leases cover that?
I also like to load balance traffic on another site with two VDSL links and a 4G backup. I can’t do that without NAT.
DHCP traffic is approximately 512 bytes in each direction for each half lease period. Stick 1000 clients on a single node, with 2 second leases, and you'll use 0.5% of your bandwidth, and be able to update your default gateway every second
Re:Why you need IPv6
by AstralStorm on Thursday May 24, 2018 @03:38AM
(#17141866)
Leases? What leases, this is not DHCP. If you mean Route Advertisement with short life, then yes.
The leases referenced by the post I was replying to:
“Why not use Stateless DHCP, and configure a machine with short leases”
How do you deal with one missed RA causing an inadvertent failover to using a different WAN, while maintaining 1-2s failover after the first WAN link goes down?
Also this does not fix the issue with inability to load balance without NAT. Eg I have a desktop (or tablet etc) that I want to send VoIP out one WAN and everything else out another.
When it comes to routing, you have two options, delegate or self-manage. In the case of self-management, yes, if you want complex route management, then you'll need software that handles complex route management.
Why not use Stateless DHCP, and configure a machine with short leases that can update the others as needed? It can handle the complex routing, and the clients just have to frequently ask if there are updates.