Richard is talking about a server configuration, while you are talking about a client - totally different situation.
What do you see in the System Log?
Jan 1 01:00:10 WAN Connection: ISP's DHCP did not function properly.
Jan 1 01:00:10 RT-AC66U: start httpd
Jan 1 01:00:10 crond[303]: crond: crond (busybox 1.20.2) started, log level 8
Jan 1 01:00:15 disk monitor: be idle
Jan 1 01:00:16 kernel: br0: port 1(vlan1) entering disabled state
Jan 1 01:00:16 kernel: vlan1: dev_set_promiscuity(master, 1)
Jan 1 01:00:16 kernel: br0: port 1(vlan1) entering listening state
Jan 1 01:00:16 kernel: br0: port 1(vlan1) entering learning state
Jan 1 01:00:16 kernel: br0: topology change detected, propagating
Jan 1 01:00:16 kernel: br0: port 1(vlan1) entering forwarding state
Jan 1 01:00:16 dnsmasq-dhcp[291]: DHCPREQUEST(br0) 192.168.1.100 00:1e:0b:ef:50:78
Jan 1 01:00:16 dnsmasq-dhcp[291]: DHCPACK(br0) 192.168.1.100 00:1e:0b:ef:50:78 HPEF5078
Jan 1 01:00:17 dnsmasq[291]: read /etc/hosts - 5 addresses
Jan 1 01:00:17 dnsmasq[291]: read /etc/hosts.dnsmasq - 8 addresses
Jan 1 01:00:17 dnsmasq-dhcp[291]: read /etc/ethers - 9 addresses
Jan 1 01:00:17 dnsmasq[291]: using nameserver 8.8.4.4#53
Jan 1 01:00:17 dnsmasq[291]: using nameserver 8.8.8.8#53
Jan 1 01:00:17 dnsmasq[291]: read /etc/hosts - 5 addresses
Jan 1 01:00:17 dnsmasq[291]: read /etc/hosts.dnsmasq - 8 addresses
Jan 1 01:00:17 dnsmasq-dhcp[291]: read /etc/ethers - 9 addresses
Jan 1 01:00:17 dnsmasq[291]: using nameserver 8.8.4.4#53
Jan 1 01:00:17 dnsmasq[291]: using nameserver 8.8.8.8#53
Jan 1 01:00:17 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Jan 1 01:00:17 dnsmasq[291]: exiting on receipt of SIGTERM
Jan 1 01:00:17 dnsmasq[360]: started, version 2.65 cachesize 1500
Jan 1 01:00:17 dnsmasq[360]: compile time options: IPv6 GNU-getopt no-RTC no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack
Jan 1 01:00:17 dnsmasq[360]: asynchronous logging enabled, queue limit is 5 messages
Jan 1 01:00:17 dnsmasq-dhcp[360]: DHCP, IP range 192.168.1.2 -- 192.168.1.254, lease time 1d
Jan 1 01:00:17 dnsmasq[360]: read /etc/hosts - 5 addresses
Jan 1 01:00:17 dnsmasq[360]: read /etc/hosts.dnsmasq - 8 addresses
Jan 1 01:00:17 dnsmasq-dhcp[360]: read /etc/ethers - 9 addresses
Jan 1 01:00:17 dnsmasq[360]: using nameserver 8.8.4.4#53
Jan 1 01:00:17 dnsmasq[360]: using nameserver 8.8.8.8#53
Jan 1 01:00:18 kernel: nf_conntrack_rtsp v0.6.21 loading
Jan 1 01:00:18 kernel: nf_nat_rtsp v0.6.21 loading
Jan 1 01:00:18 rc_service: udhcpc 342:notify_rc stop_upnp
Jan 1 01:00:18 rc_service: udhcpc 342:notify_rc start_upnp
Jan 1 01:00:18 miniupnpd[395]: HTTP listening on port 36696
Jan 1 01:00:18 miniupnpd[395]: Listening for NAT-PMP traffic on port 5351
Jan 1 01:00:20 WAN Connection: WAN was restored.
Jan 1 01:00:28 dnsmasq-dhcp[360]: DHCPREQUEST(br0) 192.168.1.102 00:27:10:b1:d7:40
Jan 1 01:00:28 dnsmasq-dhcp[360]: DHCPACK(br0) 192.168.1.102 00:27:10:b1:d7:40 FRANCK-PC
Jan 1 01:00:28 rc_service: udhcpc 342:notify_rc start_vpnclient1
Jan 1 01:00:28 rc_service: udhcpc 342:notify_rc start_vpnclient2
Jan 1 01:00:28 rc_service: start_vpnclient2 is waitting start_vpnclient1...
Jan 1 01:00:28 kernel: tun: Universal TUN/TAP device driver, 1.6
Jan 1 01:00:28 kernel: tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
Jan 1 01:00:30 openvpn[403]: OpenVPN 2.3.0 mipsel-unknown-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [MH] [IPv6] built on Jul 24 2013
Jan 1 01:00:30 openvpn[403]: NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Jan 1 01:00:30 openvpn[403]: Socket Buffers: R=[116736->131072] S=[116736->131072]
Jan 1 01:00:30 openvpn[408]: UDPv4 link local: [undef]
Jan 1 01:00:30 openvpn[408]: UDPv4 link remote: [AF_INET]62.233.34.2:53
Jan 1 01:00:30 openvpn[408]: TLS: Initial packet from [AF_INET]62.233.34.2:53, sid=d7813d0d 1fc99432
Jan 1 01:00:30 openvpn[408]: WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Jan 1 01:00:31 dnsmasq-dhcp[360]: DHCPINFORM(br0) 192.168.1.102 00:27:10:b1:d7:40
Jan 1 01:00:31 dnsmasq-dhcp[360]: DHCPACK(br0) 192.168.1.102 00:27:10:b1:d7:40 FRANCK-PC
Jan 1 01:00:31 openvpn[408]: VERIFY OK: depth=1, C=UK, ST=NR, L=Attleborough, O=Hide My butt! Pro, OU=VPN, CN=vpn.hidemyass.com, emailAddress=ca@hidemyass.com
Jan 1 01:00:31 openvpn[408]: VERIFY OK: nsCertType=SERVER
Jan 1 01:00:31 openvpn[408]: VERIFY OK: depth=0, C=UK, ST=NR, L=Attleborough, O=Hide My butt! Pro, OU=VPN, CN=server, emailAddress=vpn@hidemyass.com
Jan 1 01:00:32 openvpn[408]: Data Channel Encrypt: Cipher 'BF-CBC' initialized with 128 bit key
Jan 1 01:00:32 openvpn[408]: Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Jan 1 01:00:32 openvpn[408]: Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key
Jan 1 01:00:32 openvpn[408]: Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Jan 1 01:00:32 openvpn[408]: Control Channel: TLSv1, cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA
Jan 1 01:00:32 openvpn[408]: [server] Peer Connection Initiated with [AF_INET]62.233.34.2:53
Jan 1 01:00:34 openvpn[408]: SENT CONTROL [server]: 'PUSH_REQUEST' (status=1)
Jan 1 01:00:34 openvpn[408]: PUSH: Received control message: 'PUSH_REPLY,topology subnet,route-gateway 10.200.4.1,dhcp-option DNS 208.67.222.222,dhcp-option DNS 208.67.220.220,ping 10,ping-restart 90,redirect-gateway def1,ifconfig 10.200.5.2 255.255.252.0'
Jan 1 01:00:34 openvpn[408]: OPTIONS IMPORT: timers and/or timeouts modified
Jan 1 01:00:34 openvpn[408]: OPTIONS IMPORT: --ifconfig/up options modified
Jan 1 01:00:34 openvpn[408]: OPTIONS IMPORT: route options modified
Jan 1 01:00:34 openvpn[408]: OPTIONS IMPORT: route-related options modified
Jan 1 01:00:34 openvpn[408]: OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified
Jan 1 01:00:34 openvpn[408]: TUN/TAP device tun11 opened
Jan 1 01:00:34 openvpn[408]: TUN/TAP TX queue length set to 100
Jan 1 01:00:34 openvpn[408]: do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Jan 1 01:00:34 openvpn[408]: /sbin/ifconfig tun11 10.200.5.2 netmask 255.255.252.0 mtu 1500 broadcast 10.200.7.255
Jan 1 01:00:34 openvpn[408]: /sbin/route add -net 0.0.0.0 netmask 128.0.0.0 gw 10.200.4.1
Jan 1 01:00:34 openvpn[408]: /sbin/route add -net 128.0.0.0 netmask 128.0.0.0 gw 10.200.4.1
Jan 1 01:00:34 openvpn[408]: Initialization Sequence Completed
Jan 1 01:00:43 rc_service: skip the event: start_vpnclient2.
Jan 1 01:00:44 rc_service: udhcpc 342:notify_rc stop_ntpc
Jan 1 01:00:44 rc_service: stop_ntpc is waitting start_vpnclient1...
Jan 1 01:00:59 rc_service: skip the event: stop_ntpc.
Jan 1 01:00:59 rc_service: udhcpc 342:notify_rc start_ntpc
Jan 1 01:00:59 rc_service: start_ntpc is waitting start_vpnclient1...
Jan 1 01:01:14 rc_service: skip the event: start_ntpc.
Jan 1 01:01:14 dhcp client: bound 192.168.0.70 via 192.168.0.1 during 86400 seconds.
I copied and past after the reboot. Internet is ok but it doesn't work. Able to ping.
Next i turn off the vpn , reboot and it works.
Re-encrypte the key crash the router !!!
It is the same config than with the 29beta
Funroc