Most sources identify 576 as an average size of packets over the Internet (see RFC 1191). Others suggest that 402.7 bytes is the average size (see http://advanced.comms.agilent.com/routertester/member/journal/1MxdPktSzThroughput.html). However, a packet size of 576 is approximately 50 percent of the packet size distribution.
VPN Concentrator 3.5 Help menu, Configuration, Policy Management, Traffic Management, SA.
www.cisco.com/warp/public/471/vpn_3000_auth.html.
Release Notes for Cisco VPN Client for Windows, Release 3.5.1; www.cisco.com/univercd/cc/td/doc/product/vpn/client/rel3_5_1/351_3kcl.htm.
"Installing the VPN Client User Guide for Linux, Solaris, and Mac OS X." www.cisco.com/univercd/cc/td/doc/product/vpn/client/nonwin35/user_gd/index.htm.