@ylluminate take a look at nftables (in the Ubuntu repos), home page is netfilter.org
Netfilter software and nftables in particular are used in applications such as Internet connection sharing, firewalls, IP accounting, transparent proxying, advanced routing and traffic control.
@ylluminate gist.github.com/ylluminate/1a3c21f127bfe3d4c93fa79effc097c6 looks solid to me as far as routing now based on what I understand you're expecting. Traffic for the local 192.168.10.0/24 network will be on eth0, all Internet traffic will route via eth1, unless eth1 is down and then it will fall back to eth2. What else are you expecting regarding routing?
If it's about getting machines connected to eth0 to route out to the Internet, yes that's a NAT question which is separate from netplan
@slangasek then yes, that is the question. i was trying to understand in that i was under the impression that NAT'ing was part of netplan... my goal is for this device to act essentially as an internet "multiplexer" that takes 2 or 3 isps and then hands them all back and forth across eth0 which is the LAN interface...
basically i want the 192.168.10.1 interface recipient (eg, 192.168.10.2) to be a DMZ for all traffic from eth1, eth2, and eth3
so @heynnema i'll give that last link a close look when i have a chance this evening. i have to ask myself: what is the best / cleanest option to do this on ubuntu? hopefully this is it vs some of the others i've been exploring as it seems as though it can get rather messy and ufw had some poor results. (cc @slangasek)
Discussion between ylluminate and hey…
Discussion between ylluminate and hey…