<p>I'm trying to setup a VPN to access my cluster's workloads without setting public endpoints.</p>

<p>Service is deployed using the OpenVPN helm chart, and kubernetes using Rancher v2.3.2</p>

<ul>
<li>replacing L4 loadbalacer with a simple service discovery</li>
<li>edit configMap to allow TCP to go through the loadbalancer and reach the VPN</li>
</ul>

<p><strong>What does / doesn't work:</strong> </p>

<ul>
<li>OpenVPN client can connect successfully</li>
<li>Cannot ping public servers</li>
<li>Cannot ping Kubernetes services or pods</li>
<li>Can ping openvpn cluster IP "10.42.2.11"</li>
</ul>

<p><strong>My files</strong></p>

<p><code>vars.yml</code></p>

<pre><code>---
replicaCount: 1
nodeSelector:
  openvpn: "true"
openvpn:
  OVPN_K8S_POD_NETWORK: "10.42.0.0"
  OVPN_K8S_POD_SUBNET: "255.255.0.0"
  OVPN_K8S_SVC_NETWORK: "10.43.0.0"
  OVPN_K8S_SVC_SUBNET: "255.255.0.0"
persistence:
  storageClass: "local-path"
service:
  externalPort: 444
</code></pre>

<p>Connection works, but I'm not able to hit any ip inside my cluster.
The only ip I'm able to reach is the openvpn cluster ip.</p>

<p><code>openvpn.conf</code>:</p>

<pre><code>server 10.240.0.0 255.255.0.0
verb 3

key /etc/openvpn/certs/pki/private/server.key
ca /etc/openvpn/certs/pki/ca.crt
cert /etc/openvpn/certs/pki/issued/server.crt
dh /etc/openvpn/certs/pki/dh.pem



key-direction 0
keepalive 10 60
persist-key
persist-tun

proto tcp
port  443
dev tun0
status /tmp/openvpn-status.log

user nobody
group nogroup

push "route 10.42.2.11 255.255.255.255"

push "route 10.42.0.0 255.255.0.0"


push "route 10.43.0.0 255.255.0.0"



push "dhcp-option DOMAIN-SEARCH openvpn.svc.cluster.local"
push "dhcp-option DOMAIN-SEARCH svc.cluster.local"
push "dhcp-option DOMAIN-SEARCH cluster.local"
</code></pre>

<p><code>client.ovpn</code></p>

<pre><code>client
nobind
dev tun

remote xxxx xxx tcp
CERTS CERTS

dhcp-option DOMAIN openvpn.svc.cluster.local
dhcp-option DOMAIN svc.cluster.local
dhcp-option DOMAIN cluster.local
dhcp-option DOMAIN online.net
</code></pre>

<p>I don't really know how to debug this.</p>

<p>I'm using windows</p>

<p><code>route</code> command from client</p>

<pre><code>Destination     Gateway         Genmask         Flags Metric Ref    Use Ifac
0.0.0.0         livebox.home    255.255.255.255 U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     256    0        0 eth0
192.168.1.17    0.0.0.0         255.255.255.255 U     256    0        0 eth0
192.168.1.255   0.0.0.0         255.255.255.255 U     256    0        0 eth0
224.0.0.0       0.0.0.0         240.0.0.0       U     256    0        0 eth0
255.255.255.255 0.0.0.0         255.255.255.255 U     256    0        0 eth0
224.0.0.0       0.0.0.0         240.0.0.0       U     256    0        0 eth1
255.255.255.255 0.0.0.0         255.255.255.255 U     256    0        0 eth1
0.0.0.0         10.240.0.5      255.255.255.255 U     0      0        0 eth1
10.42.2.11      10.240.0.5      255.255.255.255 U     0      0        0 eth1
10.42.0.0       10.240.0.5      255.255.0.0     U     0      0        0 eth1
10.43.0.0       10.240.0.5      255.255.0.0     U     0      0        0 eth1
10.240.0.1      10.240.0.5      255.255.255.255 U     0      0        0 eth1
127.0.0.0       0.0.0.0         255.0.0.0       U     256    0        0 lo  
127.0.0.1       0.0.0.0         255.255.255.255 U     256    0        0 lo  
127.255.255.255 0.0.0.0         255.255.255.255 U     256    0        0 lo  
224.0.0.0       0.0.0.0         240.0.0.0       U     256    0        0 lo  
255.255.255.255 0.0.0.0         255.255.255.255 U     256    0        0 lo  
</code></pre>

<p>And finally <code>ifconfig</code></p>

<pre><code>        inet 192.168.1.17  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 2a01:cb00:90c:5300:603c:f8:703e:a876  prefixlen 64  scopeid 0x0&lt;global&gt;
        inet6 2a01:cb00:90c:5300:d84b:668b:85f3:3ba2  prefixlen 128  scopeid 0x0&lt;global&gt;
        inet6 fe80::603c:f8:703e:a876  prefixlen 64  scopeid 0xfd&lt;compat,link,site,host&gt;
        ether 00:d8:61:31:22:32  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=4163&lt;UP,BROADCAST,RUNNING,MULTICAST&gt;  mtu 1500
        inet 10.240.0.6  netmask 255.255.255.252  broadcast 10.240.0.7
        inet6 fe80::b9cf:39cc:f60a:9db2  prefixlen 64  scopeid 0xfd&lt;compat,link,site,host&gt;
        ether 00:ff:42:04:53:4d  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73&lt;UP,LOOPBACK,RUNNING&gt;  mtu 1500
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0xfe&lt;compat,link,site,host&gt;
        loop  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
</code></pre>

<p>For anybody looking for a working sample, this is going to go into your openvpn deployment along side your container definition:</p>

<pre><code>initContainers:
- args:
  - -w
  - net.ipv4.ip_forward=1
  command:
  - sysctl
  image: busybox
  name: openvpn-sidecar
  securityContext:
    privileged: true
</code></pre>
