Network Performance Troubleshooting
Techniques to aid with network troubleshooting.
A common source of packet loss is network devices that can not handle larger bursts of packets. These devices include switches, routers, and security appliances. If you experience moderate loss (e.g.: 300-1000 packets in a 10 second test) it is likely due to a small buffer somewhere in the path. There are two ways to test if you have such a device in your path: use packet pacing to see if there… Read More
Here are some other things to look at: Use netstat -s to see if there are a lot of TCP retransmissions. TCP retransmits usually indicate network congestion, but can also happen with bad network hardware, or misconfigured networks. You may also see some TCP retransmissions if the sending host is much faster than the receiving host, but TCP flow control should make the number of retransmits… Read More