Tcp ip packet
TCP IP PACKET WINDOWS
However, using a –human-readable or -h switch normally results in output using binary prefixes which is rather confusing Linux commands display file size information using metric prefixes.Ethernet speeds are typically quoted using metric prefixes, so a 100Mb Ethernet link is exactly that (100,000,000bit).
TCP IP PACKET SERIAL
TCP IP PACKET FULL
the full bandwidth is available both upstream and downstream, at the same time Use of a full duplex communications medium, i.e.TCP & IP packet headers of 40Bytes (no TCP options).One way, one to one host communication data and overhead.No retries, packet losses or other events occur.The following assumptions have been made when formulating these calculations Skip to the end for the summary if you really can’t face the math.
It fills me with confidence knowing the answers I provide to questions of bandwidth and performance are not based on hypothetical fantasy (albiet still caveated with “plus application overheads”).īy the way, if you’re wondering why you can’t shove that 1GB file over a 1Gb link at a decent speed, that’s a whole other ballgame, very well explained by Brad Hedlund here. When someone technical complains about network performance, I like to have some real figures ready as to why they will never, ever get 100Mb of data down that Fast Ethernet link in 1 second.
All these bits and Bytes matter to Facebook and Google too, when you’re dealing with hyper-scale connection and data rates, shaving off even 0.5% becomes a big deal SPDY is a good example of efforts to help with this.Īlso, when I want to understand something, I really want to understand it. You might think that these matters are pointless in our high bandwidth world but lets not forget that for the global majority, internet connectivity still looks like a 9600 modem at best. To put it another way, you’ve lost 13% of your bandwidth on a good day, just on network overheads. What’s the big deal with a 1s difference? Well, extrapolate that increase, let’s say it’s 13%, and a file transfer that should take an hour actually takes around 1hr 8 minutes in ideal conditions, ignoring application overhead. It’s almost 8.5s without the IPSec and over 9s with it. How long will it take to transfer a 100MB file over an IPSec tunnel running across a dedicated 100Mbps Ethernet link? 1 Second? Fail! 8s? You’re getting warmer.