WG endpoint node exit to inet and DNS resolver

[Kalin KOZHUHAROV]

On Mon, May 7, 2018 at 1:21 PM, ѽ҉ᶬḳ℠ <vtol at gmx.net> wrote:
> 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1 as WG endpoint node
> WG 0.0.20180420-1
> DHCP no
> Firewall off (both server and client)
> wg-quick not utilized
>
> Which DNS resolver is utilized by the clients inside a WG tunnel, the
> client's resolver or the server's? And can this be tweaked in WG?
>
There are no "clients inside a WG tunnel", only traffic inside the tunnel :-D
On a standard linux, this is controlled by /etc/resolv.conf whether or
not there is VPN.
/etc/resolv.conf can be (mis-)managed by dhcp clients and other daemons.
For most boxes I use dnscache running on 127.0.0.1 and I do
occasionally configure it to forward queries to another cache (so
/etc/resolv.conf is never touched).


> Clients are connecting to the endpoint node and subnets each end are
> reachable through the tunnel. The traffic to the inet from the WG however is
> not escaping via the server's default route. Added the IPS's gateway node
> (81.x.x.x) to the WG iface but that did not provide inet connection for the
> connected clients.
>
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 0.0.0.0         81.x.x.x    0.0.0.0         UG    0      0 0 eth0
> 81.x.x.x    0.0.0.0         255.255.255.255 UH    0      0 0 wg0
> 192.168.120.0   0.0.0.0         255.255.255.0   U     0 0        0 wg0
>
Not sure what you want to do here...
Assuming your other end of the WG tunnel is say 192.168.120.1, then
you should add it as a default gw (and it should route your packets).
ip route add default via 192.168.120.1
(no need for `dev wg0` at the end I think)

Kalin.