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work interface to the next This introduces a very slight delay typically only a few milliseconds However, traffic on the Internet might have to travel through more than fifty routers when making a round trip between two computers, so the delays do add up Busy routers and networks that are near saturation can introduce more latency because the router might have to wait several milliseconds before it can place a packet onto a network interface Distance also introduces latency packets travel across networks at a speed slightly slower than the speed of light a rough estimate of the speed packets travel would be about 100,000 miles per second although the speed is still very fast, a packet that has to travel to the other side of the Earth and back would have at least 250 ms of latency (before you calculate latency introduced by routers).

Satellite connections add about 500 ms of latency sending the packet to and from the satellite In addition, network paths are often very indirect, and packets often travel several times farther than the distance of a straight line between two computers VpNs, in particular, can cause extremely indirect routing between computers The most common tool to measure latency is the command-line tool ping ping can give you a rough idea of the latency between two points, but it is less than perfect because ping does not transmit TCp-based data Instead, ping sends Internet Control Message protocol (ICMp) messages that are designed for diagnostic purposes Many routers give these ICMp messages a lower priority than other traffic, so ping may report a higher latency than normal In addition, many routers and computers are configured to completely block the ICMp messages used by ping.

a related command-line tool, pathping, provides approximate latency information for all routers between two hosts pathping uses the same ICMp messages as ping If latency is causing a problem on your network, first determine the source of the latency If distance is causing the latency, find ways to shorten the distance For example, you might replace a satellite link with a terrestrial link alternatively, if you determine that the path being taken between two points is inefficient, you might.

be able to reconfigure your network to shorten the distance that the packets need to travel between the two points. If you determine that busy networks or routers are introducing latency, you can upgrade your routers or increase the available bandwidth. alternatively, you can use policy-based QoS to prioritize the most important traffic to reduce latency for time-sensitive transmissions, such as streaming media and VOIp.

As you can see, high network latency can hurt performance, especially when combined with small TCP receive window sizes . Computers can reduce the negative impact of highlatency networks by increasing the TCP receive window size . However, versions of Windows prior to Windows Vista used a static, small, 64-KB receive window . This setting was fine for low-bandwidth and low-latency links, but it offered limited performance on high-bandwidth, high-latency links . Figure 25-10 shows the throughput that a TCP connection can get with various static values of the receive window over different latency conditions . As you can see, the maximum throughput of a TCP connection with the default receive window of 64 KB can be as low as 5 Mbps even within a single continent and can go all the way down to 1 Mbps on a satellite link .

18

Windows Vista and Windows 7 include an auto-tuning capability for TCP receive window size that is enabled by default . Every TCP connection can benefit in terms of increased throughput and decreased transfer times, but high-bandwidth, high-latency connections will benefit the most . Therefore, Receive Window Auto-Tuning can benefit network performance significantly across both satellite and WAN links . However, performance on high-speed LANs where latency is very low will benefit less .

Receive Window Auto-Tuning continually determines the optimal receive window size on a per-connection basis by measuring the bandwidth-delay product (the bandwidth multiplied by the latency of the connection) and the application retrieve rate, and it automatically adjusts the maximum receive window size on an ongoing basis . For auto-tuning to dramatically improve the throughput on a connection, all of the following conditions must be true: