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I wrote a program that sends and receives packets with a VLAN tag using Linux promiscuous mode. This program is for playing with a VLAN switch. If you compile it without a switch (#define VLAN), you can send and receive untagged (i.e., normal Ethernet) packets.
To test connectivity through an IP network, "ping" is usually used. However, "ping" cannot be used or it is not convenient when non IP environment or using network interfaces directly. This page shows a simple tool for such situation. This tool can of course be used under an Ethernet environment, but it can also be used when Ethernet is not available but the promiscuous mode of Linux can be used.
Although we can buy a high-performance Ethernet switch at 10 or 20 dollars, a programmable (software) switch is convenient for experimental purpose such as observing the learning steps. The following program is a Ethernet switching program with learning function but not completely conforming to the Ethernet standard.
This page contains all entries posted to Small and Large Stones of Programming in May 2012. They are listed from oldest to newest.
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