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The Impact of Virtual Private Networking Tunnel Encryption on 802.11b Wireless LAN Performance
The Tolly Group, July 2003
Wireless LANs that support the Ieee 802.11b standard are able to deliver a maximum throughput of about 6 Mbps to each workstation on a LAN segment. Such a throughput expectation, however, does not factor in the impact that security overhead, in the form of VPN tunnels, has on the overall client-server session. Two factors come into play when VPNs are used: encryption and cryptography.
Encryption uses packet envelopes, which, ultimately means less bandwidth for data. Cryptography, meanwhile, places processing burdens on both the client PC and the access point CPUs.
This new report, “The Impact of Virtual Private Networking Tunnel Encryption on 802.11b Wireless LAN Performance,” examines the impact that VPNs have on four representative access points from Cisco Systems, D-Link Systems, Orinoco, and 3Com Corp. Engineers discuss the performance degradation experienced when tested with encryption and cryptographic functions isolated. Engineers share a number of best practices to guard against the impact of VPN security on wireless connections. Detailed test cases are provided so users can replicate the tests for their own environments and an Executive Summary puts the findings in perspective from a performance standpoint.
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