Figure 11: Encapsulating Security Payload - Nortel 200 Technical Configuration Manual

Technical Configuration Guide:
SOHO Secure RAS with VPN Gateway and VPN Router V1.0 September, 2006
The captured data reveals that voice and data passing through the VPN tunnel (between source/destination of
192.168.2.241 and 192.168.2.100) are protected by the Encapsulating Security Payload (ESP, RFC2406), a key
protocol in the IPsec. The ESP provides confidentiality and integrity by encrypting data to be protected and
placing the encrypted data in the data portion of the IP ESP.
See below example of Ethereal examination:

Figure 11: Encapsulating Security Payload

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