root@OpenWrt:/# cat /etc/config/network

config 'interface' 'loopback'
        option 'ifname' 'lo'
        option 'proto' 'static'
        option 'ipaddr' '127.0.0.1'
        option 'netmask' '255.0.0.0'

config 'interface' 'lan'
        option 'ifname' 'eth0'
        option 'type' 'bridge'
        option 'proto' 'static'
        option 'ipaddr' '192.168.1.1'
        option 'netmask' '255.255.255.0'
        option 'stp' '1'

config 'interface' 'wan'
        option 'ifname' 'eth1'
        option 'proto' 'dhcp'

config 'switch'
        option 'name' 'rtl8366s'
        option 'reset' '1'
        option 'enable_vlan' '1'

config 'switch_vlan'
        option 'device' 'rtl8366s'
        option 'vlan' '1'
        option 'ports' '0 1 2 3 5'

config 'interface' 'vpn'
        option 'server' '192.168.1.2'
        option 'username' 'test'
        option 'password' 'test'
        option 'proto' 'pptp'
        option 'defaultroute' '0'

config 'route'
        option 'interface' 'vpn'
        option 'target' '10.11.12.0'
        option 'netmask' '255.255.255.0'
        option 'gateway' '10.68.0.1'

root@OpenWrt:/#
root@OpenWrt:/# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.2     192.168.1.2     255.255.255.255 UGH   0      0        0 br-lan
10.68.0.1       0.0.0.0         255.255.255.255 UH    0      0        0 pptp-vpn
10.11.12.0      10.68.0.1       255.255.255.0   UG    0      0        0 pptp-vpn
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 br-lan
0.0.0.0         192.168.1.2     0.0.0.0         UG    0      0        0 br-lan
root@OpenWrt:/# uci -P /var/state show network.vpn
network.vpn=interface
network.vpn.server=192.168.1.2
network.vpn.username=test
network.vpn.password=test
network.vpn.proto=pptp
network.vpn.defaultroute=0
network.vpn.device=pptp-vpn
network.vpn.ipaddr=10.68.0.100
network.vpn.gateway=10.68.0.1
network.vpn.up=1
network.vpn.connect_time=261321
network.vpn.ifname=pptp-vpn
root@OpenWrt:/# traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 38 byte packets
 1  192.168.1.2 (192.168.1.2)  1.377 ms  2.283 ms  1.143 ms
 2  uplink.lan (10.11.12.13)  2.361 ms  2.223 ms  2.100 ms
 3  *  *  *
 4  83-169-174-46-isp.superkabel.de (83.169.174.46)  10.852 ms  11.595 ms  14.441 ms
 5  83-169-183-134-isp.superkabel.de (83.169.183.134)  17.817 ms  14.964 ms  8.598 ms
 6  83-169-128-74.static.superkabel.de (83.169.128.74)  17.487 ms  14.938 ms  18.214 ms
 7  83-169-128-57.static.superkabel.de (83.169.128.57)  16.385 ms  22.133 ms  15.066 ms
 8  83-169-128-61.static.superkabel.de (83.169.128.61)  15.911 ms  21.167 ms  21.826 ms
 9  209.85.249.184 (209.85.249.184)  20.890 ms  19.639 ms  209.85.249.182 (209.85.249.182)  27.057 ms
10  64.233.174.53 (64.233.174.53)  15.414 ms  216.239.48.53 (216.239.48.53)  17.094 ms  64.233.174.29 (64.233.174.29)  16.110 ms
11  209.85.250.1 (209.85.250.1)  24.134 ms  209.85.255.245 (209.85.255.245)  27.237 ms  209.85.250.1 (209.85.250.1)  23.105 ms
12  google-public-dns-a.google.com (8.8.8.8)  18.124 ms  18.376 ms  15.860 ms
root@OpenWrt:/# traceroute 10.11.12.13
traceroute to 10.11.12.13 (10.11.12.13), 30 hops max, 38 byte packets
 1  10.68.0.1 (10.68.0.1)  14.890 ms  19.843 ms  19.924 ms
 2  uplink.lan (10.11.12.13)  19.874 ms  19.847 ms  19.913 ms
root@OpenWrt:/#