>> It turns out, NetBSD needs similar handling of subnet topology for tun
>> interfaces as OpenBSD does.
>>
>> Here is a patch to fix the issue (against OpenVPN 2.4.6):
>
> This comes as a bit of surprise - has something changed here on the
> NetBSD side? Which NetBSD version did you test this against, how
> does the problem manifest itself?
>
> I do run CI tests on various NetBSD versions, and never had an issue
> with --topology subnet there...
I tried both NetBSD-7.1 and NetBSD-current (which is now at 8.99.21), and my
OpenVPN setup does not work without the patch. On server side, I use a simple
config like this (certificate sections omitted):
local 192.168.56.1
proto tcp-server
dev tun
topology subnet
persist-tun
persist-key
server 10.1.0.0 255.255.0.0
client-config-dir /dist/pkg/etc/openvpn/ccd
tls-server
tls-auth static.key 0
On client side (NetBSD) it looks like this:
remote 192.168.56.1 1194
proto tcp-client
dev tun
persist-tun
persist-key
tls-client
nobind
remote-cert-tls server
tls-auth static.key 1
auth-nocache
pull
tun0 interface and routing are configured as these:
% ifconfig tun0
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
inet 10.1.0.2 -> 10.1.0.2 netmask 0xffff0000
inet6 fe80::a00:27ff:fef1:6df7%tun0 -> prefixlen 64 scopeid 0x4
% route -n show | grep 10.1
10.1.0.2 10.1.0.2 UH - - - tun0
and the VPN network is unreachable (e.g. can't ping 10.1.0.1).
However, with the patch applied, the network looks this:
% ifconfig tun0
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
inet 10.1.0.2 -> 10.1.0.1 netmask 0xffff0000
inet6 fe80::a00:27ff:fef1:6df7%tun0 -> prefixlen 64 scopeid 0x4
% route -n show | grep 10.1
10.1/16 10.1.0.1 UG - - - tun0
10.1.0.1 10.1.0.2 UH - - - tun0
and VPN works correctly.
Hoping that clarifies your concern. :)
Kind regards,
Adam
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