Network Analysis Using Wireshark 2 Cookbook - Second Edition

How to do it...

To check FTP performance problems, follow these steps:

1. First, check for any Ethernet, IP, or TCP problems as described in previous chapters. In many cases, slow responses happen due to networking problems and not necessarily due to application problems. Perform simple ICMP ping (with a larger packet size, say 1,500 bytes) between the client and server, as it helps to find if there is any delay or failures along the path.
2. Check for TCP retransmissions and duplicate ACKs. Check whether they are on the entire traffic or only on the FTP connection:
   • If you get it on various connections, it is probably due to a slow network that influences the entire traffic
   • If you get it only on FTP connections to the same server or client, it ...