![]() ![]() Other times it is desirable to collect access logs from web services implemented on different environments (various web servers, application servers, python web frameworks, etc.) or web services that are not accessible and therefore traceable only on client side. Because they are in a “production” environment and cannot be too much verbose or they are in-house developed applications and do not provide such logging. Often the logging level and monitoring systems of these systems does not report important information to determine performance issues such as the response time of each network request. In very complex and distributed systems is often useful to understand how communication takes place between different components, and when this is implemented as a network protocol based on TCP/IP (HTTP, JDBC, RTSP, SIP, SMTP, IMAP, POP, LDAP, REST, XML-RPC, IIOP, SOAP, etc.), justniffer becomes very useful. It will help you to quickly identify the most significant bottlenecks analyzing the performance at “application” protocol level. Justniffer was born as tool for helping in analyzing performance problem in complex network environment when it becomes impractical to analyze network captures solely using wireshark. Optimized for “Request / Response” protocols. Precisely, it uses a slightly modified version of the libnids libraries that already include a modified version of Linux code in a more reusable way. It uses portions of Linux kernel source code for handling all TCP/IP stuff. The main Justniffer’s feature is the ability to handle all those complex low level protocol issues and retrieve the correct flow of the TCP/IP traffic: IP fragmentation, TCP retransmission, reordering. Justniffer’s native capture file format is libpcap format, which is also the format used by tcpdump and various other tools. It lets you interactively trace tcp traffic from a live network or from a previously saved capture file. Justniffer is a network protocol analyzer that captures network traffic and produces logs in a customized way, can emulate Apache web server log files, track response times and extract all “intercepted” files from the HTTP traffic. ![]()
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