interface FastEthernet0/1.1
 encapsulation dot1Q 1
 ip address 10.13.13.13 255.255.255.0
 ip nat inside
 ip virtual-reassembly

interface FastEthernet0/1.900
 encapsulation dot1Q 900
 ip address 217.13.24.22 255.255.255.248
 ip nat outside
 ip virtual-reassembly

interface Loopback8
 ip address x.x.x.x 255.255.255.255
 ip nat outside
 ip virtual-reassembly

access-list 101 permit ip 217.13.24.21 0.0.0.7 host x.x.x.x

ip nat source list 101 interface FastEthernet0/1.1 overload
ip nat outside source static x.x.x.x z.z.z.z extendable

ip route 0.0.0.0 0.0.0.0 217.13.n.1 
ip route z.z.z.0 255.255.255.0 10.13.13.1