Friday, June 6, 2008

How to configure Site-to-Site IPsec VPN?

VPN stands for Virtual Private Network, used to create an encrypted connection between private networks over a public network such as the internet. The basic form of IPsec VPN is to connect two different points using any shared network.

Basic steps for IPsec VPN Configuration:

1- First define the ISAKMP Policy.

For example:

  • Authentication

  • Hash
  • Encryption
  • Group

2- Establish IPsec transform set.

For example:

  • Esp-des

  • Esp-md5-hmac
  • Esp-aes
  • Asp-sha-hmac

3- Configure crypto access list.

For example:

  • Define interesting traffics

4- Configure crypto map

Used to verify the previously defined parameters.

5- Now apply crypto map on the interface.

Used to verify the outgoing interface traffic.

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