Problem solve Get help with specific problems with your technologies, process and projects.

Does the MTU need to be changed for the VPN header?

In this Ask the Expert response, VPN expert Rainer Enders discusses the process in which the VPN header can be created.

Do I need to change the maximum transmission unit (MTU) for the VPN header?

Internet Protocol Security (IPsec) adds protocol overhead to each packet, which can lead to fragmentation. Fragmented packets then need to be reassembled at the receiving gateway, which can lead to performance degradation. Pre-fragmentation of packets can help keep the packet size at a level where fragmentation is not likely to occur, which aids performance in the network. The protocol overhead depends on the type of encryption that is chosen and can be calculated accordingly.

Email your VPN-related questions to editor@searchenterprisewan.com.

This was last published in January 2012

Dig Deeper on Network virtualization technology

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.