! Listing 8.25: Router External #1 with link to the ISP serving 100.0.0.0/24, using static routing and NAT
!
!Copyright (C) 2001 by Vincent C Jones. All Rights Reserved.


version 11.2
!
hostname External_1
!
ip subnet-zero
ip nat pool net-100 100.0.0.128 100.0.0.143 netmask 255.255.255.240
ip nat inside source list 1 pool net-100 overload
!
interface Ethernet0
 description No Man's Land LAN #1
 ip address 100.0.0.33 255.255.255.224
 ip access-group 193 in
 no ip redirects
 no ip directed-broadcast
 ip nat inside
 standby 1 priority 110
 standby 1 preempt
 standby 1 authentication External
 standby 1 ip 100.0.0.35
 standby 1 track Serial0 30
!
interface Ethernet1
 description No Man's Land LAN #2
 ip address 101.0.0.34 255.255.255.224
 ip access-group 194 in
 no ip redirects
 no ip directed-broadcast
 ip nat inside
 standby 2 priority 90
 standby 2 preempt
 standby 2 authentication External
 standby 2 ip 101.0.0.35
!
interface Serial0
 description Link to the Internet via ISP serving 100.0.0.0/24
 ip address 110.0.0.1 255.255.255.252
 ip access-group 191 in
 ip access-group 192 out
 no ip unreachables
 no ip directed-broadcast
 ip nat outside
 bandwidth 1544
!
ip route 0.0.0.0 0.0.0.0 Serial0
ip route 0.0.0.0 0.0.0.0 100.0.0.34 200
ip route 100.0.0.0 255.255.255.0 Null0
ip route 100.0.0.8 255.255.255.248 100.0.0.46
ip route 100.0.0.16 255.255.255.240 100.0.0.46
ip route 100.0.0.64 255.255.255.192 100.0.0.46
ip route 100.0.0.128 255.255.255.240 101.0.0.46
ip route 120.0.0.0 255.255.255.252 100.0.0.34
!
access-list 1 permit 101.0.0.0 0.0.0.127
!
end