What determines the performance of the VPN?

Greetings from the guru,

In fact, what determines especially lan-to-lan, VPN, performance/speed? Is - this physical bandwidth of each side or there at - it specific settings on the devices somewhere?

The reason why I ask is because I'm about to sign a new contract internet for my corp office where I host services, such as an Email/AV/database for my remote offices. I can increase my speed 30Mbps or 50Mbps and the price difference is not much so if it will help my vpn tunnels, that I'm all for it, but maybe it's null?

Here is my configuration:

  • Corp. office: ASA5510 with 20/20Mbps internet
  • Remote 17: RV325 with 15/3Mbps internet

The internet provider up all my remote offices is on the same basis of provider and I have between them decent response time (on average 30ms). I used to have a 7Mbps on the copper lines before moving to Metro Ethernet to my office for Corp. and the difference between that and the 20Mbps was considerable, but with 2 different technologies I don't know if I'll actually see a performance difference between 50Mbps and 30Mbps but would appreciate your thoughts.

Thanks in advance!

Unless the devices are not the factor limiting (the ASA 5510 is not for 20/20) it's mainly the bandwidth of the provider connection which limits the flow VPN.

More bandwidth is almost always a good idea, but if the bandwidth is not the limit, then there is no seam.

I would first install a monitoring (like Paessler PRTG) solution and monitor the use of the VPN and the external interface of the ASA. So you see what is the probability that the external additional bandwidth will help you.

Tags: Cisco Security

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