Não entendi bem uma questão.
Se a rede definida por mim é 10.0.0.0/24 de onde o Openvpn está buscando o IP 192.168.0.2?
rodei o comando tcpdump -ni any port 1194 e obtive a saída abaixo.
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes
16:22:07.598713 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:07.598733 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:09.742542 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:09.742560 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:10.789876 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:10.789894 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:12.875810 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:12.875834 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:14.962044 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:14.962074 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:17.101431 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:17.101463 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:19.136871 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:19.136896 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:21.288650 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:21.288669 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:23.453779 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:23.453815 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:25.624983 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:25.625014 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:27.787835 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:27.787855 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:30.101075 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:30.101099 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:32.564027 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:32.564058 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:33.795852 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:33.795874 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:36.261983 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:36.262010 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:38.723679 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:38.723713 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:39.955124 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:39.955155 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:42.278266 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:42.278297 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:44.602112 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:44.602144 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:46.924287 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:46.924320 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:22:51.255056 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:22:51.255087 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:08.286338 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:08.286363 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:10.668639 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:10.668659 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:11.860103 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:11.860134 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:14.243901 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:14.243936 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:16.627257 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:16.627288 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:17.818252 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:17.818286 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:19.881896 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:19.881916 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:21.944047 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:21.944073 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:32.500248 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:32.500278 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:34.782235 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:34.782253 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:37.066036 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:37.066068 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:39.351982 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:39.352013 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:41.636520 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:41.636552 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:43.866146 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:43.866162 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:46.048645 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:46.048676 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:48.232003 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:48.232036 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:50.414957 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:50.414977 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:52.598463 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:52.598496 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:53.790481 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:53.790512 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:56.173650 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:56.173678 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
16:23:58.556047 IP 192.168.100.122.65123 > 177.39.15.46.1194: UDP, length 42
16:23:58.556082 IP 192.168.0.2.65123 > 177.39.15.46.1194: UDP, length 42
Quando disconecto o cliente ele para de processar ou seja, está recebendo trafego, porém não conecta.