Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I setup a vpc and launched 3 EC2 instances all in subnet. I am wondering how these instances connected to each other, 100mbit, 1000mbit?

share|improve this question
up vote 4 down vote accepted

The physical interface is at least gigabit, and known to be 10 gigabit on Amazon's "HPC" instance types.

However, that information is largely irrelevant. Amazon's infrastructure has layers of abstraction to provide the scalability and manageability required for an operation at this scale. The network latency between regular EC2 instances can be surprisingly high, and varies a great deal over time.

Since your VPN runs on top of the regular EC2 networks, you'll have to consider this variance. So you will need to benchmark this yourself, and keep the benchmarks running for a day or two while your EC2 instance is under load -- to get a feel for how latency & throughput look 'on an average day'.

share|improve this answer

I think you would have to ask amazon, as they are hosting these virtual machines.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.