I'm getting a lot of ARP broadcast packets on my network that are clogging up the bandwidth. Using Wireshark here's an example of what I'm seeing: 671 73.961012 Dell_80:a9:13 Broadcast ARP 42 Who has ...

As I understand things... An ARP request is a system querying an IP address and asking for the MAC associated with that address. Routers and switches send to MACs not IPs (right?) so they need to know ...

A Cisco security advisory outlines weaknesses in its WLAN controllers that could lead to the kind of inadvertent denial of service attacks that affected Duke’s wireless net. Cisco has just released a ...

Building a firewall is something that easily can be done using a Linux machine. This article describes the basic steps involved in developing a firewall from scratch, using tools in Linux. It is ...

Layer 2 of the OSI model is where we find the Data Link Layer, which provides the mechanism by which data is transferred from node to node across a network. What makes this layer important is that it ...

Packet capture is one of the most fundamental and powerful ways to do network analysis. You can learn virtually anything about what is going on within a network by intercepting and examining the raw ...