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Differences between a VPN Router and a VPN Server

VPN router and a VPN server
VPN router and a VPN server
  1. Tell two major differences between a VPN router and a VPN server (e.g., Cisco VPN concentrator).
  2. Consider the site-to-site VPN scenario shown in Figure 2. Letís deploy the AH protocol on the two VPN routers (see Figure 2) so that no desktop on the two sites need to do any AH operations.

Assumptions

Figure 2: 

When Alice sends message ďStock X price $29Ē to Bob, the message sender program running on Aliceís desktop needs to firstly compose the packet. Please draw the whole packet.†

When this packet is intercepted by John, can John know what the message is? Why?

When the packet is processed by the VPN router on Site 2, what will the VPN router do? Please give a step-by-step answer.

Can this IP spoofing attack fool the VPN router on Site 2? Why? Note that John will try his best to fake a hash to fool the VPN router.

Assumptions:

The IP address of Aliceís desktop is 130.2.3.244; the IP address of Bobís desktop is 166.100.66.2.

Since neither Alice nor Bob trusts all employees in their companies, they would use the Transport Mode of ESP.

When Alice sends message ďStock X price $29Ē to Bob, the message sender program running on Aliceís desktop needs to firstly compose the packet before it is encrypted. This cleartext packet will be the exact same packet in your answer for Question 1. Next, the sender program will use ESP to encrypt the packet.

After this packet is encrypted, what does the packet look like? Please draw the whole packet and mark the fields that are encrypted.

Differences between a VPN Router and a VPN Server

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