Ytdyklly

I'd like to have only one program run through a wireguard config I have stored at /etc/wireguard/config.conf, and all the other programs run through the normal IP address.

I've found this page in the wireguard use on routing, which suggests using namespaces, but when I try to run some of the commands, such as

sudo ip link set wlp2s0 netns physical

RTNETLINK answers: Invalid argument

Suggesting this can't be done through arch linux. Has anyone found a way to get specific programs to run through wireguard?

I tried the above tutorial on a different machine, and I get the following error when trying to load my wireguard config.

wg setconf wgvpn0 /etc/wireguard/my_vpn.conf : invalid format, yet the same config works perfectly when using wg-quick up

Side point, does anyone know of any issue tracking system for wireguard? The questions I submit to their mailing list aren't publicly available.

From the wireguard.com's link provided in OP's question, specifically in The New Namespace Solution, it's explained how to move physical interfaces, with an ethernet and a wireless example, bold emphasis mine:

First we create the "physical" network namespace:

# ip netns add physical

Now we move eth0 and wlan0 into the "physical" namespace:

# ip link set eth0 netns physical

# iw phy phy0 set netns name physical

(Note that wireless devices must be moved using iw and by
specifying the physical device phy0.)

it appears OP read the first ip link set ... netns command, but didn't see that the second command was needed instead for a wireless device, as noted.

iw's manual page is scarce, but iw --help includes:

   phy <phyname> set netns { <pid> | name <nsname> }

            Put this wireless device into a different network namespace:

                <pid>    - change network namespace by process id

                <nsname> - change network namespace by name from /run/netns

                           or by absolute path (man ip-netns)

Some drivers might not yet be compatible with network namespaces. This output is required for it to work:

$ sudo iw phy0 info|grep netns

         * set_wiphy_netns

Assuming there's only one simple wireless device, wlp2s0 is handled by iw via its phy0 counterpart, so won't appear at all in the command. This must be used:

sudo iw phy phy0 set netns name physical