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Tema: VPN site to site CISCO (Leído 7839 veces)
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VPN site to site CISCO
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en:
Junio 09, 2011, 09:57:34 pm »
Aqui les dejo este escenario de vpn site to site en routers con modulos de vpn de cisco es un poco intermedio-avanzado pero para que practiquen ya que las vpn son algo de lo más usado en cuanto a seguridad en corporativos.
Les dejo el escenario en packet tracer 5.3 dentro vienen las instrucciones de que hacer, ya esta configurado pero le pueden dar en reset y configurarlo ustedes mismos y les dejo la configuración de como se debe de hacer.
http://www.megaupload.com/?d=CVOWQXYP
PT Activity: Configure and Verify a Site-to-Site IPsec VPN using CLI
Instructor Version
Topology Diagram
Addressing Table
Device Interface IP Address Subnet Mask
R1 Fa0/0 192.168.1.1 255.255.255.0
S0/0/0 10.1.1.2 255.255.255.252
R2 S0/0/0 10.1.1.1 255.255.255.252
Fa0/0 192.168.2.1 255.255.255.0
S0/0/1 10.2.2.1 255.255.255.252
R3 S0/0/1 10.2.2.2 255.255.255.252
Fa0/0 192.168.3.1 255.255.255.0
PC-A NIC 192.168.1.3 255.255.255.0
PC-B NIC 192.168.2.3 255.255.255.0
PC-C NIC 192.168.3.3 255.255.255.0
Learning Objectives
• Verify connectivity throughout the network.
• Configure router R1 to support a site-to-site IPsec VPN with R3.
Introduction
The network topology shows three routers. Your task is to configure routers R1 and R3 to support a site-to-site IPsec VPN when traffic flows from their respective LANs. The IPsec VPN tunnel is from router R1 to router R3 via R2. R2 acts as a pass-through and has no knowledge of the VPN. IPsec provides secure transmission of sensitive information over unprotected networks such as the Internet. IPsec acts at the network layer, protecting and authenticating IP packets between participating IPsec devices (peers), such as Cisco routers.
ISAKMP Phase 1 Policy Parameters
Parameters R1 y R3
Key distribution method Manual or ISAKMP: ISAKMP
Encryption algorithm DES, 3DES, or AES: AES
Hash algorithm MD5 or SHA-1: SHA-1
Authentication method Pre-shared keys or RSA: pre-share
Key exchange DH Group 1, 2, or 5: DH 2
IKE SA Lifetime 86400 seconds or less: 86400
ISAKMP Key : vpnpa55
Note: Bolded parameters are defaults. Only unbolded parameters have to be explicitly configured.
IPsec Phase 2 Policy Parameters
Parameters R1 R3
Transform Set VPN-SET VPN-SET
Peer Hostname R3 R1
Peer IP Address 10.2.2.2 10.1.1.2
Network to be encrypted 192.168.1.0/24 192.168.3.0/24
Crypto Map name VPN-MAP VPN-MAP
SA Establishment ipsec-isakmp ipsec-isakmp
The routers have been pre-configured with the following:
• Password for console line: ciscoconpa55
• Password for vty lines: ciscovtypa55
• Enable password: ciscoenpa55
• RIP version 2
Task 1: Configure IPsec parameters on R1
Step 1. Test connectivity.
Ping from PC-A to PC-C.
Step 2. Identify interesting traffic on R1.
Configure ACL 110 to identify the traffic from the LAN on R1 to the LAN on R3 as interesting. This interesting traffic will trigger the IPsec VPN to be implemented whenever there is traffic between R1 to R3 LANs. All other traffic sourced from the LANs will not be encrypted. Remember that due to the implicit deny all, there is no need to configure a deny any any statement.
R1(config)# access-list 110 permit ip 192.168.1.0 0.0.0.255 192.168.3.0 0.0.0.255
Step 3. Configure the ISAKMP Phase 1 properties on R1.
Configure the crypto ISAKMP policy 10 properties on R1 along with the shared crypto key vpnpa55. Refer to the ISAKMP Phase 1 table for the specific parameters to configure. Default values do not have to be configured therefore only the encryption, key exchange method, and DH method must be configured.
R1(config)# crypto isakmp policy 10
R1(config-isakmp)# encryption aes
R1(config-isakmp)# authentication pre-share
R1(config-isakmp)# lifetime 86400
R1(config-isakmp)# group 2
R1(config-isakmp)# exit
R1(config)# crypto isakmp key vpnpa55 address 10.2.2.2
Step 4. Configure the ISAKMP Phase 2 properties on R1.
Create the transform-set VPN-SET to use esp-3des and esp-sha-hmac. Then create the crypto map VPN-MAP that binds all of the Phase 2 parameters together. Use sequence number 10 and identify it as an ipsec-isakmp map.
R1(config)# crypto ipsec transform-set VPN-SET esp-3des esp-sha-hmac
R1(config)# crypto map VPN-MAP 10 ipsec-isakmp
R1(config-crypto-map)# description VPN connection to R3
R1(config-crypto-map)# set peer 10.2.2.2
R1(config-crypto-map)# set transform-set VPN-SET
R1(config-crypto-map)# match address 110
R1(config-crypto-map)# exit
Step 5. Configure the crypto map on the outgoing interface.
Finally, bind the VPN-MAP crypto map to the outgoing Serial 0/0/0 interface. Note: This is not graded.
R1(config)# interface S0/0/0
R1(config-if)# crypto map VPN-MAP
Task 2: Configure IPsec Parameters on R3
Step 1. Configure router R3 to support a site-to-site VPN with R1.
Now configure reciprocating parameters on R3. Configure ACL 110 identifying the traffic from the LAN on R3 to the LAN on R1 as interesting.
R3(config)# access-list 110 permit ip 192.168.3.0 0.0.0.255 192.168.1.0 0.0.0.255
Step 2. Configure the ISAKMP Phase 1 properties on R3.
Configure the crypto ISAKMP policy 10 properties on R3 along with the shared crypto key vpnpa55.
R3(config)# crypto isakmp policy 10
R3(config-isakmp)# encryption aes
R3(config-isakmp)# authentication pre-share
R3(config-isakmp)# group 2
R3(config-isakmp)# lifetime 86400
R3(config-isakmp)# exit
R3(config)# crypto isakmp key vpnpa55 address 10.1.1.2
Step 3. Configure the ISAKMP Phase 2 properties on R1.
Like you did on R1, create the transform-set VPN-SET to use esp-3des and esp-sha-hmac. Then create the crypto map VPN-MAP that binds all of the Phase 2 parameters together. Use sequence number 10 and identify it as an ipsec-isakmp map.
R3(config)# crypto ipsec transform-set VPN-SET esp-3des esp-sha-hmac
R3(config)# crypto map VPN-MAP 10 ipsec-isakmp
R3(config-crypto-map)# description VPN connection to R1
R3(config-crypto-map)# set peer 10.1.1.2
R3(config-crypto-map)# set transform-set VPN-SET
R3(config-crypto-map)# match address 110
R3(config-crypto-map)# exit
Step 4. Configure the crypto map on the outgoing interface.
Finally, bind the VPN-MAP crypto map to the outgoing Serial 0/0/1 interface. Note: This is not graded.
R3(config)# interface S0/0/1
R3(config-if)# crypto map VPN-MAP
Task 3: Verify the IPsec VPN
Step 1. Verify the tunnel prior to interesting traffic.
Issue the show crypto ipsec sa command on R1. Notice that the number of packets encapsulated, encrypted, decapsulated and decrypted are all set to 0.
Step 2. Create interesting traffic.
From PC-A, ping PC-C.
Step 3. Verify the tunnel after interesting traffic.
On R1, re-issue the show crypto ipsec sa command. Now notice that the number of packets is more than 0 indicating that the IPsec VPN tunnel is working.
Step 4. Create uninteresting traffic.
From PC-A, ping PC-B.
Step 5. Verify the tunnel.
On R1, re-issue the show crypto ipsec sa command. Finally, notice that the number of packets has not changed verifying that uninteresting traffic is not encrypted.
Step 6. Check results.
Your completion percentage should be 100%. Click Check Results to see feedback and verification of which required components have been completed.
Saludos.
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