VPN Throughput

I have just set up a point-to-point VPN tunnel between a 3825 central and two 2811 remote on a 100 MB connection via Ethernet.

I'm using the AES 256 encryption for isakmp and ipsec. Speeds w/o the active tunnel between the remote and central site are that 60-70 Mb speeds WITH the tunnel are 28-32 MB.

Why such a significant decrease in speed? This is a good result and I would be able to increase the speed of some how?

CPU utilization on the 2811 about 75% increases when a large amount of traffic is passed. I guess it has something to do with the speed decreases.

The process of encryption/decryption of packets is performed by the processor. Just like on a busiest PC CPU, they slow everything performs. You're in luck, however. Cisco has a PURPOSE which performs the encryption/decryption and allows the CPU to perform other tasks. You will see a 'speed' when using the card for the PURPOSE of gain. Here is a link for more information.

http://www.Cisco.com/en/us/prod/collateral/routers/ps5853/data_sheet_vpn_aim_for_18128003800routers_ps5853_Products_Data_Sheet.html

A useful guide once they are installed-

https://www.Cisco.com/en/us/docs/iOS/12_4t/12_4t11/htvpnssl.html

It will be useful.

Tags: Cisco Security

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