hostname R1
!
interface loopback 0
 ip address 172.16.1.1 255.255.255.0
!
router rip
 version 2
 network 172.16.1.0
!
crypto isakmp enable
!
crypto isakmp policy 10
 authentication pre-share
 encryption aes 256
 hash sha
 group 5
 lifetime 3600
!
crypto isakmp key cisco address 192.168.100.104
!
crypto ipsec transform-set 50 esp-aes 256 esp-sha-hmac ah-sha-hmac
 exit
!
crypto ipsec security-association lifetime seconds 1800
!
access-list 101 permit ip 172.16.1.0 0.0.0.255 172.16.3.0 0.0.0.255
!
crypto map MYMAP 10 ipsec-isakmp
 match address 101
 set peer 192.168.100.104
 set pfs group5
 set transform-set 50
 set security-association lifetime seconds 900
!
interface fastethernet0/0
 crypto map MYMAP

hostname R2
!
interface loopback 0
 ip address 172.16.3.1 255.255.255.0
!
router rip
 version 2
 network 172.16.3.0
 network 192.168.100.0
!
crypto isakmp enable
!
crypto isakmp policy 10
 authentication pre-share
 encryption aes 256
 hash sha
 group 5
 lifetime 3600
!
crypto isakmp key cisco address 192.168.100.103
!
crypto ipsec transform-set 50 esp-aes 256 esp-sha-hmac ah-sha-hmac
 exit
!
crypto ipsec security-association lifetime seconds 1800
!
access-list 101 permit ip 172.16.3.0 0.0.0.255 172.16.1.0 0.0.0.255
!
crypto map MYMAP 10 ipsec-isakmp
 match address 101
 set peer 192.168.100.103
 set pfs group5
 set transform-set 50
 set security-association lifetime seconds 900
!
interface fastethernet0/0
 crypto map MYMAP

R1#<input>show crypto isakmp policy</input>
Global IKE policy
Protection suite of priority 10
        encryption algorithm:   AES - Advanced Encryption Standard (256 bit keys).
        hash algorithm:         Secure Hash Standard
        authentication method:  Pre-Shared Key
        Diffie-Hellman group:   #5 (1536 bit)
        lifetime:               3600 seconds, no volume limit
Default protection suite
        encryption algorithm:   DES - Data Encryption Standard (56 bit keys).
        hash algorithm:         Secure Hash Standard
        authentication method:  Rivest-Shamir-Adleman Signature
        Diffie-Hellman group:   #1 (768 bit)
        lifetime:               86400 seconds, no volume limit
R1#<input>show crypto ipsec transform-set</input>
Transform set 50: { ah-sha-hmac  }
   will negotiate = { Tunnel,  },
   { esp-256-aes esp-sha-hmac  }
   will negotiate = { Tunnel,  },
R1#show crypto map
Crypto Map "MYMAP" 10 ipsec-isakmp
        Peer = 192.168.100.104
        Extended IP access list 101
            access-list 101 permit ip 172.16.1.0 0.0.0.255 172.16.3.0 0.0.0.255
        Current peer: 192.168.100.104
        Security association lifetime: 4608000 kilobytes/900 seconds
        PFS (Y/N): Y
        DH group:  group5
        Transform sets={
                50,
        }
        Interfaces using crypto map MYMAP:
                FastEthernet0/0

C1#<input>ping 172.16.3.1 source 172.16.1.1</input>
Sending 5, 100-byte ICMP Echos to 172.16.3.1, timeout is 2 seconds:
Packet sent with a source address of 172.16.1.1
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/2/4 ms
C1#show crypto ipsec sa

interface: FastEthernet0/0.1
    Crypto map tag: MYMAP, local addr 192.168.100.103

   protected vrf: (none)
   local  ident (addr/mask/prot/port): (172.16.1.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (172.16.3.0/255.255.255.0/0/0)
   current_peer 192.168.100.104 port 500
     PERMIT, flags={origin_is_acl,ipsec_sa_request_sent}
    <notice>#pkts encaps: 4, #pkts encrypt: 4, #pkts digest: 4
    #pkts decaps: 4, #pkts decrypt: 4, #pkts verify: 4</notice>
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #send errors 1, #recv errors 0

     local crypto endpt.: 192.168.100.103, remote crypto endpt.: 192.168.100.104
     path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0/0.1
     current outbound spi: 0x521B43F6(1377518582)

     inbound esp sas:
      spi: 0x92A7A6F8(2460460792)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 2001, flow_id: FPGA:1, crypto map: MYMAP
        sa timing: remaining key lifetime (k/sec): (4400183/893)
        IV size: 16 bytes
        replay detection support: Y
        <notice>Status: ACTIVE</notice>

     inbound ah sas:
      spi: 0xFE07354B(4261885259)
        transform: ah-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 2001, flow_id: FPGA:1, crypto map: MYMAP
        sa timing: remaining key lifetime (k/sec): (4400183/887)
        replay detection support: Y
        <notice>Status: ACTIVE</notice>

     inbound pcp sas:

     outbound esp sas:
      spi: 0x521B43F6(1377518582)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 2002, flow_id: FPGA:2, crypto map: MYMAP
        sa timing: remaining key lifetime (k/sec): (4400183/887)
        IV size: 16 bytes
        replay detection support: Y
        <notice>Status: ACTIVE</notice>

     outbound ah sas:
      spi: 0xB6D629E1(3067488737)
        transform: ah-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 2002, flow_id: FPGA:2, crypto map: MYMAP
        sa timing: remaining key lifetime (k/sec): (4400183/886)
        replay detection support: Y
        <notice>Status: ACTIVE</notice>

     outbound pcp sas: