IPsec Tunnel Mode encapsulates and protects an entire IP packet. Because IPsec tunnel mode encapsulates or hides the IP header of the packet, a new IP header must be added for the packet to be successfully forwarded. The encrypting routers themselves own the IP addresses used in these new headers. Tunnel mode may be employed with Encapsulating Security Payload (ESP) and/or Authentication Header. Using tunnel mode results in additional packet expansion of approximately 20 bytes associated with the new IP header. Tunnel mode expansion of the IP packet.
"You need to figure out the avg packet size for the traffic between the two routers. Add the above 52 bytes and figure out if the utilization matches to what you see "
For the OP, the impact of what Narayan describes . . .
If 52 bytes overhead is being added per packet, and a) packets are small (e.g. perhaps 576 default MTU), and b) packets are being fragmented (i.e. 2x packet with additional overhead), that might add about 20% to traffic.
If lots of minimum size packets, e.g. ACKs, that would increase such traffic by about 80%.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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