Q

What is the bandwidth utilized on Internet VPN?

What is the bandwidth utilized on Internet VPN? (If for example -- a lease line will be 128 kpbs.)

The bandwidth used by a VPN will depend on the bandwidth demand and the bandwidth of the connection. If you would like to know what the overhead of a VPN is -- the bandwidth consumed by the protocol overhead of the VPN -- that depends on the VPN technology being used and on the size of the data packets being transported. For example, for an IPSec VPN, added header overhead is 20 bytes per packet. If the average packet size is 20 bytes (not out of the question for VoIP data), overhead will be 100 percent. On the other hand, if the average packet size is 1000 bytes, the overhead will be 2 percent.
 

This was first published in January 2004

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