*Help, plzz. about sharing GPRS connection with PC by usbnet

[hch680]

I want to share the e680g GPRS connection with my PC through usbnet. Got some problems.

On PC, I route ALL traffic through the usb connection:
route del default
route add default gw 169.254.1.2 (which is the phone's usbl0's ip)

On Phone, I Click MackNAT.lin, I've copied the modules and scripts under /diska/.system/QTDownLoad/mack/iptables
My MackNAT.lin is like:

ln -s /diska/.system/QTDownLoad/mack /tmp/
echo 1 >/proc/sys/net/ipv4/ip_forward
insmod /tmp/mack/iptables/modules/ip_tables.o
insmod /tmp/mack/iptables/modules/iptable_filter.o
insmod /tmp/mack/iptables/modules/ip_conntrack.o
insmod /tmp/mack/iptables/modules/iptable_nat.o
insmod /tmp/mack/iptables/modules/ipt_MASQUERADE.o
/tmp/mack/iptables/sbin/iptables -t nat -A POSTROUTING -s 169.254.0.0/16 -o gprsv0 -j MASQUERADE

I'm sure that the GPRS connection works well.

but the PC can't access the internet, when i type "traceroute www.google.com" on PC, it says

traceroute to www.google.com (66.249.89.99), 30 hops max, 40 byte packets
1 169.254.1.2 (169.254.1.2) 5.779 ms 1.680 ms 0.979 ms
2 * * *
3 * * *
4 * * *

it likes that the phone can't route the packet out, why is that?

help, plzzz

[hch680]

uuuuuuuuuuup