Asus rt-n66u: strange route issue after enable openvpn

I bought a rt-n66u and installed Merlin 378.55 firmware. Then I enabled the openvpn server1. After the vpn server is enabled. I found I can't access some website. Such as 14.17.32.229.

I checked the route table. It's

admin@RT-N66U-6BA0:/tmp/home/root# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
171.214.206.1 * 255.255.255.255 UH 0 0 0 ppp0
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
192.168.0.0...

Asus rt-n66u: strange route issue after enable openvpn