administration --> commands --> commands text area --> save startup
sleep 90
OLDGW=$(nvram get wan_gateway)
VPNSRV=$(nvram get pptpd_client_srvip)
VPNSRVSUB=$(nvram get pptpd_client_srvsub)
PPTPDEV=$(route -n | grep ^${VPNSRVSUB%.[0-9]*} | awk '{print $NF}' | head -n 1)
VPNGW=$(ifconfig $PPTPDEV | grep -Eo "P-t-P:([0-9.]+)" | cut -d: -f2)
route add -host $VPNSRV gw $OLDGW
route del default gw $OLDGW
route add default gw $VPNGW
routing table
root@DD-WRT:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.240.1 0.0.0.0 UG 0 0 0 ppp0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
169.254.0.0 * 255.255.0.0 U 0 0 0 br0
192.168.0.0 * 255.255.0.0 U 0 0 0 vlan1
192.168.1.0 * 255.255.255.0 U 0 0 0 br0
192.168.240.0 * 255.255.255.0 U 0 0 0 ppp0
192.168.240.1 * 255.255.255.255 UH 0 0 0 ppp0
220.135.10.98 192.168.179.1 255.255.255.255 UGH 0 0 0 vlan1
enhanced script
#!/bin/sh
OLDGW=$(nvram get wan_gateway)
VPNSRV=$(nvram get pptpd_client_srvip)
VPNSRVSUB=$(nvram get pptpd_client_srvsub)
PPTPDEV=$(route -n | grep ^${VPNSRVSUB%.[0-9]*} | awk '{print $NF}' | head -n 1)
while [ ${#PPTPDEV} -eq 0 ]; do
PPTPDEV=$(route -n | grep ^${VPNSRVSUB%.[0-9]*} | awk '{print $NF}' | head -n 1)
echo "Retry"
sleep 5
done
VPNGW=$(ifconfig $PPTPDEV | grep -Eo "P-t-P:([0-9.]+)" | cut -d: -f2)
route add -host $VPNSRV gw $OLDGW
route del default gw $OLDGW
route add default gw $VPNGW
ref: http://junan.name/1544.html
