IPSEC encryption beyond the borders of the country

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  3. R1 uses the R1 certificate to prove the correctness of the signature which is again an asymmetric cryptographic operation. Prior to this, the received certificate has be validated which also has one ore more Asymmetric cryptographic operations.
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  Lab-HQ-rtr #telnet 172.22.1.1 it's Branch1rtr
  172.22.1.1 by train... Open

  User access audit

  Username: andrewb
  Password:

  Lab-branch1-rtr #sh crypto ipsec his

  Interface: Tunnel0
  Tag crypto map: addr Tunnel0-head-0, local 50.50.50.1

  protégé of the vrf: (none)
  local ident (addr, mask, prot, port): (50.50.50.1/255.255.255.255/47/0) * thought I'd see the src and dst the telnet address *

  Remote ident (addr, mask, prot, port): (50.50.50.3/255.255.255.255/47/0)
  current_peer 50.50.50.3 port 500
  LICENCE, flags is {origin_is_acl},
  #pkts program: 14307, #pkts encrypt: 14307, #pkts digest: 14307
  #pkts decaps: 14286, #pkts decrypt: 14286, #pkts check: 14286
  compressed #pkts: 0, unzipped #pkts: 0
  #pkts uncompressed: 0, #pkts compr. has failed: 0
  #pkts not unpacked: 0, #pkts decompress failed: 0
  #send 24, #recv errors 0

  local crypto endpt. : 50.50.50.1, remote Start crypto. : 50.50.50.3
  Path mtu 1500, mtu 1500 ip, ip mtu IDB Serial0/0/0
  current outbound SPI: 0x61D48BA8 (1641319336)

  SAS of the esp on arrival:
  SPI: 0x555FD9F (89521567)
  transform: esp-3des esp-sha-hmac.
  running parameters = {Transport}
  Conn ID: 2037, flow_id: VPN:37 on board, card crypto: head-Tunnel0-0
  calendar of his: service life remaining (k/s) key: (4598507/3044)
  Size IV: 8 bytes
  support for replay detection: Y
  Status: ACTIVE

  the arrival ah sas:

  SAS of the CFP on arrival:

  outgoing esp sas:
  SPI: 0x61D48BA8 (1641319336)
  transform: esp-3des esp-sha-hmac.
  running parameters = {Transport}
  Conn ID: 2038, flow_id: VPN:38 on board, card crypto: head-Tunnel0-0
  calendar of his: service life remaining (k/s) key: (4598507/3033)
  Size IV: 8 bytes
  support for replay detection: Y
  Status: ACTIVE

  outgoing ah sas:

  outgoing CFP sas:
  Lab-branch1-rtr #.

  Lab-HQ-rtr #sh ip route
  C 50.50.50.0 is directly connected, Serial0/0/0
  172.22.0.0/16 is variably divided into subnets, 4 subnets, 2 masks
  C 172.22.3.1/32 is directly connected, Loopback0
  D 172.22.2.1/32 [90/2944000] via 192.168.254.2, 21:18:04, Tunnel0
  D 172.22.1.1/32 [90/2944000] via 192.168.254.1, 21:19, Tunnel0
  D 172.22.64.32/27 [90/2816256] via 192.168.254.2, 21:18:04, Tunnel0
  [90/2816256] via 192.168.254.1, 21:18:04, Tunnel0
  10.0.0.0/24 is divided into subnets, 5 subnets
  D 10.10.10.0 [90/2816256] via 192.168.254.1, 21:19, Tunnel0
  D 10.10.20.0 [90/2816256] via 192.168.254.1, 21:19, Tunnel0
  D 10.10.30.0 [90/2816256] via 192.168.254.2, 21:18:04, Tunnel0
  D 10.10.40.0 [90/2816256] via 192.168.254.2, 21:18:04, Tunnel0
  D 10.10.50.0 [90/2816256] via 192.168.254.1, 21:19:02, Tunnel0
  C 192.168.254.0/24 is directly connected, Tunnel0
  C 192.168.1.0/24 is directly connected, FastEthernet0/0

  IPv4 Crypto ISAKMP Security Association
  status of DST CBC State conn-id slot
  50.50.50.3 50.50.50.2 QM_IDLE 1002 ASSETS 0
  50.50.50.3 50.50.50.1 QM_IDLE 1001 ASSETS 0

  Hi Andy,.

  DMVPN will use routing to control this traffic will be encrypted. You can add ACLs as the regular crypto-plan to specify the traffic of interest, but which is not must have.

  When the traffic leaving the router, it will do the routing research first; If the next hop points on your tunnel interface and the traffic is encapsulated and encrypted; If the next hop points to another interface, the traffic will leave the router without encryption.

  ISAKMP SAs are built between your tunnel end points, as see you in the output of "show isakmp crypto his." You can check the traffic was encrypted or not by looking at the
  #pkts program: 14307, #pkts encrypt: 14307, #pkts digest: 14307
  #pkts decaps: 14286, #pkts decrypt: 14286, #pkts check: 14286

  If you really want to see the package, you can EXTEND it to a monitor station traffic.

  HTH,

  Lei Tian

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