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GNetWatch 4.0 beta (Default branch)
12-30-2008
GNetWatch is an application that offers real-time graphical monitoring and analysis of network performance through SNMP and ICMP. To get an instant view of the network state, data are collected, stored, and displayed every few seconds. Two traffic generation modules are available. The former can flood UDP packets of any size (jumbo frames for instance) and tagged with any DiffServ/ToS flag for QoS and class of services testing. The latter can generate a huge quantity of parallel requests to any HTTP(s) server for Web application load testing. To automatically discover new hosts, GNetWatch can make use of Ethereal/WireShark and later invoke NMap to get information about the remote systems. Note that IPv6 and SNMPv3 are fully supported by GNetWatch. License: GNU General Public License (GPL) Changes:|
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icmp(4p) icmp(4p) Name icmp - Internet Control Message Protocol Syntax #include <sys/socket.h> #include <netinet/in.h> s = socket(AF_INET, SOCK_RAW, proto); Description The ICMP is the error and control message protocol used by the Internet Protocol (IP) transport layer and the Internet protocol family. It can be accessed through a ``raw socket'' for network monitoring and diagnostic functions. The proto argument to the socket call to create an ICMP socket is obtained from the routine. ICMP sockets are connectionless, and are normally used with the and system calls. The call can also be used to fix the destination for future packets (in which case the or and or system calls can then be used). Outgoing packets automatically have an IP header prepended to them (based on the destination address). Incoming packets are received with the IP header and options intact. Diagnostics On failure, a socket operation returns any of the following errors: [EISCONN] Tried to establish a connection on a socket that already has one, or tried to send a datagram with the destination address specified and the socket was already connected. [ENOTCONN] Tried to send a datagram, but no destination address was specified, and the socket has not connected. [ENOBUFS] The system ran out of memory for an internal data structure. [EADDRNOTAVAIL] An attempt was made to create a socket with a network address for which no network interface exists. See Also inet(4f), intro(4n), ip(4p) icmp(4p)