IPSEC transport mode and GET VPN

All,
I am about to implement GET VPN while read the following from Cisco's website:
IPsec transport mode suffers from fragmentation and reassembly limitations and must not be used in
deployments where encrypted or clear packets might require fragmentation.
I just do not understand why transport mode will suffer fragmentation and reassembly while it had less overhead than tunnel mode.

One thing to understand about Tran sport mode vs Tunnel mode (ipsec) is thst Transport is used between acyual source and destination of the ip protocol
Tunnel mode actually not only authenticates but also encrypts at the higher layers of the pckt
Pix
VPN
IP layers
Tunnel actual source and destination is encrypted at the upper layers and therefor when the packet gets to the IP Layer, it really doesnt know about or care about the iCV signature already withinh the upper PIX layer.
Also from a security standpoint because of the fact that tunnel mode encrpyts and authenticated the ip infoemation whereas transport only authenticates packets

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Hi Dave,
We've not heard from you yet. I assume the information provided by me has helped. I am marking my reply as answered now.
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Steven Lee
TechNet Community Support

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IPSEC transport mode and GET VPN

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