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Encryption & VPN overheads

jazzlim2004
Beginner
Beginner

Hi,

could someone advise me how to calculate the overheads for IPSEC VPN with AES?

Will using different encryption effect the overhead size?

Thank you

2 Replies 2

Jennifer Halim
Cisco Employee
Cisco Employee

Here is an article on how to calculate the overheads that might help:

http://www.networkstuff.eu/index.php/IPsec_Bandwidth_Overhead_Using_AES

Hope that helps.

Based on the exhibit above,

A single call using G729 codec packet                     =             120Bytes (VPN overhead included)

L3 Data transmission rate for G729 call                    =             50pps (Packets Per second)

Bit Rate                                                                 =             8

This should work out as;

120bytes x 50pps x 8bits =  48000bits

48000bits x 1024kb = 48kbps

Hope this is informative.

Many thanks,
F Hamid

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