Trouble with WG on Synology NAS

[Berend D.]

I am using WireGuard on my Synology 415+ NAS which runs Linux kernel
3.10.105.

I tried a couple versions of wireguard now, using
https://github.com/runfalk/synology-wireguard as inspiration to compile
them, but none of them seem to work.

The problem I experience is that everything is seemingly correctly set up
(I have a Linux server elsewhere to compare configs with) but after
connecting to Wireguard, the server only seems to be able to receive
packets, not send them: when pinging the NAS I can see the ifconfig RX
packet counter go up, and at the same time the TX error counter as well.

wg0       Link encap:UNSPEC  HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:192.168.33.1  P-t-P:192.168.33.1  Mask:255.255.255.0
          UP POINTOPOINT RUNNING NOARP  MTU:1420  Metric:1
          RX packets:5 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:21 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:564 (564.0 B)  TX bytes:124 (124.0 B)

I ran over my config multiple times now but I can not spot a difference to
my working setup on the other server. I also tried various clients
(Android, Ubuntu, Windows 10 both the WG client and an alternative
implementation).

Tested versions:
- 0.0.20190227-2
- 0.0.20190601
- 0.0.20190 <https://git.zx2c4.com/WireGuard/tag/?h=0.0.20190601>702

The only thing the Synology build changes is to force memneq on since its
not supported (the 'ifeq' in Kbuild.include is removed via patch so its
always included).

I can not find a way to make it all more verbose to figure out why the
packets are dropped by WG.

What can I try to debug this?

Cheers,
Berend
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