On Mon, May 21, 2007, Rohit Grover wrote: > Hello, > > I need to discover the TCP end-to-end latency between web clients and > servers transparently (i.e. without altering the clients or the > servers in any way). I have squid running as a proxy server on a linux > box, sitting between the clients and the servers. I can have the > clients change their proxy settings to have requests pass through > squid. Squid can measure latencies between itself and the web servers. > The problem is to measure the network latency when squid tries to > forward the server responses back to clients. Linux has some hooks into user space which can provide TCP connection statistics. You could log them for both client/server and do some addition/averaging where appropriate. I -think- it includes guessed RTT, not sure. Otherwise, the ICMP database code could probably be coaxed into doing what you want. Adrian
