Internet connection on client computer

the client computer can dial out via host , i can ping the host , but client
computer cannot ping the internet thourgh the host.
the host computer connects and surfs the internet just fine,the client
computer can share files with the host. it can connect the host to the
internet but it CANNOT connect to the internet through the host computer
Host setting are:
Physical Address: 00-E0-18-3B-2D-18
IP Address: 192.168.1.100
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1
DHCP Server: 192.168.1.1
Lease Obtained: 16/03/2005 3:54:31 PM
Lease Expires: 16/03/2005 3:59:31 PM
DNS Server: 192.168.1.1
WINS Server:

Client:
Physical Address: 00-10-A4-91-A6-50
IP Address: 192.168.1.102
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1
DHCP Server: 192.168.1.1
Lease Obtained: 16/03/2005 3:56:56 PM
Lease Expires: 16/03/2005 4:01:56 PM
DNS Server: 192.168.1.1
WINS Server:

help me please