wg trunk (TM) traffic isolation: VRF vs netns

[jrun <darwinskernel@gmail.com>]

hello,

my use case is, if possible, is to provide vpn to friends and family and also
peering with other wg nodes (work etc). this obviously needs traffic isolation
and i have though about it for a while but don't have definitive answer.

1. on way i thought of doing is to have a point-to-point (dedicated wg interface
for each user) solution.

2. the other is to group interfaces based on the category of users (think friends
vs family vs even work).

they both probably need writing up something for set-up and tear-down each of
interfaces which should be fine but both would need a way of isolating traffic;
either between indivitual user's interface or between group interfaces. there is
also the question of ACL'ing the site-to-site traffic for each group and/or
user.

for this i've looked into VRF and netns; this has been brought up before
here and other place but i don't seem to be able to read the conclusion:
https://lists.zx2c4.com/pipermail/wireguard/2017-September/001706.html

from outside it looks like cumulus devs like their VRF, and wireguard devs lean
recommend using netns

https://www.wireguard.com/netns/

that^ link is not a solution for me but i can think of ways to use netns for
my case.


thoughts?

- jrun