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Задача:

Организация IPsec VPN Policy Based Site-to-Site  в VRF с использованием Pre-Shared Key для шифрования трафика в Internet(WAN) между локальной сетью(192.168.1.0/24) ESR-1 и  локальной сетью(172.16.1.0/24) ESR-2.

Параметры:

IKE:

алгоритм шифрования: 3des;

алгоритм аутентификации: sha1.

IPsec:

алгоритм шифрования: 3des ;

алгоритм аутентификации: sha1.

В конфигурации маршрутизаторов ESR-1 и ESR-2 произведена минимальная настройка firewall в качестве примера.

Конфигурация ESR-1:

ESR-1# sh running-config 
hostname ESR-1

object-group service ISAKMP
  port-range 500
  port-range 4500
exit

object-group network Local_net
  ip prefix 192.168.1.0/24
exit
object-group network Remote_net
  ip prefix 172.16.1.0/24
exit

ip vrf test
exit

security zone untrusted
  ip vrf forwarding test
exit
security zone trusted
  ip vrf forwarding test
exit

interface gigabitethernet 1/0/1
  ip vrf forwarding test
  security-zone untrusted
  ip address 192.0.2.1/30
exit
interface gigabitethernet 1/0/2
  ip vrf forwarding test
  security-zone trusted
  ip address 192.168.1.1/24
exit
security zone-pair untrusted self
  rule 1
    action permit
    match protocol udp
    match destination-port ISAKMP
    enable
  exit
  rule 10
    action permit
    match protocol esp
    enable
  exit
  rule 11
    action permit
    match protocol icmp
    enable
  exit
exit
security zone-pair untrusted trusted
  rule 10
    action permit
    match source-address Remote_net
    match destination-address Local_net
    enable
  exit
exit
security zone-pair trusted untrusted
  rule 10
    action permit
    match source-address Local_net
    match destination-address Remote_net
    enable
  exit
exit

security ike proposal IKE_PROPOSAL
exit

security ike policy IKE_POLICY
  pre-shared-key ascii-text <password>
  proposal IKE_PROPOSAL
exit

security ike gateway IKE_GATEWAY
  ike-policy IKE_POLICY
  local address 192.0.2.1
  local network 192.168.1.0/24
  remote address 198.51.100.1
  remote network 172.16.1.0/24
  mode policy-based
exit

security ipsec proposal IPSEC_PROPOSAL
exit

security ipsec policy IPSEC_POLICY
  proposal IPSEC_PROPOSAL
exit

security ipsec vpn IPSEC_VPN
  mode ike
  ip vrf forwarding test
  ike establish-tunnel route
  ike gateway IKE_GATEWAY
  ike ipsec-policy IPSEC_POLICY
  enable
exit

ip route vrf test 0.0.0.0/0 192.0.2.2

Диагностическая информация ESR-1:

ESR-1# sh security ipsec vpn status vrf test IPSEC_VPN 
Currently active IKE SA:
    Name:                      IPSEC_VPN
    State:                     Established
    Version:                   v1-only
    Unique ID:                 1
    Local host:                192.0.2.1
    Remote host:               198.51.100.1
    Role:                      Responder
    Initiator spi:             0x1d0c68c51a7cd2f8
    Responder spi:             0x16ed4123946b0295
    Encryption algorithm:      des
    Authentication algorithm:  sha1
    Diffie-Hellman group:      1
    Established:               1 hour, 46 minutes and 58 seconds ago
    Rekey time:                1 hour, 46 minutes and 58 seconds
    Reauthentication time:     1 hour, 1 minute and 1 second
    Child IPsec SAs:
        Name:                      IPSEC_VPN-4
        State:                     Installed
        Protocol:                  esp
        Mode:                      Tunnel
        Encryption algorithm:      3des
        Authentication algorithm:  sha1
        Rekey time:                31 minutes and 2 seconds
        Life time:                 43 minutes and 39 seconds
        Established:               16 minutes and 21 seconds ago
        Traffic statistics: 
            Input bytes:           873180
            Output bytes:          873180
            Input packets:         10395
            Output packets:        10395
        -------------------------------------------------------------

Шифрование трафика в WAN:

15:45:54.719594 a8:f9:4b:aa:b3:53 > a8:f9:4b:aa:38:21, ethertype IPv4 (0x0800), length 150: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ESP (50), length 136)
    192.0.2.1 > 198.51.100.1: ESP(spi=0xc1413691,seq=0x289c), length 116
15:45:54.719999 a8:f9:4b:aa:38:21 > a8:f9:4b:aa:b3:53, ethertype IPv4 (0x0800), length 150: (tos 0x0, ttl 63, id 13623, offset 0, flags [none], proto ESP (50), length 136)
    198.51.100.1 > 192.0.2.1: ESP(spi=0xcc487721,seq=0x289c), length 116
15:45:54.720073 a8:f9:4b:aa:38:21 > a8:f9:4b:aa:b3:53, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 63, id 64462, offset 0, flags [none], proto ICMP (1), length 84)
    172.16.1.10 > 192.168.1.10: ICMP echo reply, id 16, seq 1, length 64
15:45:54.720611 a8:f9:4b:aa:b3:53 > a8:f9:4b:aa:38:21, ethertype IPv4 (0x0800), length 150: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ESP (50), length 136)
    192.0.2.1 > 198.51.100.1: ESP(spi=0xc1413691,seq=0x289d), length 116

Конфигурация ESR-2:

ESR-2# sh running-config 
hostname ESR-2

object-group service ISAKMP
  port-range 500
  port-range 4500
exit

object-group network Local_net
  ip prefix 172.16.1.0/24
exit
object-group network Remote_net
  ip prefix 192.168.1.0/24
exit

ip vrf test
exit

security zone untrusted
  ip vrf forwarding test
exit
security zone trusted
  ip vrf forwarding test
exit

interface gigabitethernet 1/0/1
  ip vrf forwarding test
  security-zone untrusted
  ip address 198.51.100.1/30
exit
interface gigabitethernet 1/0/2
  ip vrf forwarding test
  security-zone trusted
  ip address 172.16.1.1/24
exit
security zone-pair untrusted self
  rule 1
    action permit
    match protocol udp
    match destination-port ISAKMP
    enable
  exit
  rule 10
    action permit
    match protocol esp
    enable
  exit
  rule 11
    action permit
    match protocol icmp
    enable
  exit
exit
security zone-pair untrusted trusted
  rule 10
    action permit
    match source-address Remote_net
    match destination-address Local_net
    enable
  exit
exit
security zone-pair trusted untrusted
  rule 10
    action permit
    match source-address Local_net
    match destination-address Remote_net
    enable
  exit
exit
security zone-pair trusted self
  rule 10
    action permit
    match protocol icmp
    enable
  exit
exit

security ike proposal IKE_PROPOSAL
exit

security ike policy IKE_POLICY
  pre-shared-key ascii-text <password>
  proposal IKE_PROPOSAL
exit

security ike gateway IKE_GATEWAY
  ike-policy IKE_POLICY
  local address 198.51.100.1
  local network 172.16.1.0/24
  remote address 192.0.2.1
  remote network 192.168.1.0/24
  mode policy-based
exit

security ipsec proposal IPSEC_PROPOSAL
exit

security ipsec policy IPSEC_POLICY
  proposal IPSEC_PROPOSAL
exit

security ipsec vpn IPSEC_VPN
  mode ike
  ip vrf forwarding test
  ike establish-tunnel route
  ike gateway IKE_GATEWAY
  ike ipsec-policy IPSEC_POLICY
  enable
exit

ip route vrf test 0.0.0.0/0 198.51.100.2

Диагностическая информация ESR-2:


ESR-2#  sh security ipsec vpn status vrf test IPSEC_VPN 
Currently active IKE SA:
    Name:                      IPSEC_VPN
    State:                     Established
    Version:                   v1-only
    Unique ID:                 1
    Local host:                198.51.100.1
    Remote host:               192.0.2.1
    Role:                      Initiator
    Initiator spi:             0x1d0c68c51a7cd2f8
    Responder spi:             0x16ed4123946b0295
    Encryption algorithm:      des
    Authentication algorithm:  sha1
    Diffie-Hellman group:      1
    Established:               1 hour, 55 minutes and 46 seconds ago
    Rekey time:                1 hour, 55 minutes and 46 seconds
    Reauthentication time:     54 minutes and 22 seconds
    Child IPsec SAs:
        Name:                      IPSEC_VPN-4
        State:                     Installed
        Protocol:                  esp
        Mode:                      Tunnel
        Encryption algorithm:      3des
        Authentication algorithm:  sha1
        Rekey time:                23 minutes and 37 seconds
        Life time:                 34 minutes and 51 seconds
        Established:               25 minutes and 9 seconds ago
        Traffic statistics: 
            Input bytes:           3657024
            Output bytes:          3657024
            Input packets:         43536
            Output packets:        43536
        -------------------------------------------------------------




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