R2#sh run | b crypto
crypto isakmp policy 10
 authentication pre-share
crypto isakmp key cisco address 180.40.7.3
!
!
crypto ipsec transform-set Prob11 ah-md5-hmac
!
crypto map Prob11 10 ipsec-isakmp
 set peer 180.40.7.3
 set transform-set Prob11
 match address Prob11
!
!
interface Serial1/2
 ip address 180.40.7.2 255.255.255.224
 clock rate 64000
 crypto map Prob11
!
ip access-list extended Prob11
 deny   ospf any any
 deny   tcp any any
 deny   udp any any
 permit ip any any




R3#
!
crypto isakmp policy 10
 authentication pre-share
crypto isakmp key cisco address 180.40.7.2
!
!
crypto ipsec transform-set Prob11 ah-md5-hmac
!
crypto map Prob11 10 ipsec-isakmp
 set peer 180.40.7.2
 set transform-set Prob11
 match address Prob11
!
interface Serial1/2
 ip address 180.40.7.3 255.255.255.224
 crypto map Prob11
!
ip access-list extended Prob11
 deny   ospf any any
 deny   tcp any any
 deny   udp any any
 permit ip any any