When working on subnet addressing, we often have to look up and double-verify any address we deal with. Some of you have been doing this for so long that you can make all these calculations off the top of your head. But for most of us, it’s a cumbersome and…
Benefits of SD-WAN In a Software-Defined Wide Area Network (SD-WAN), a branch router uses two or more network connections to dynamically route traffic over one another based on its profile. For example, real-time Voice-over-IP (VoIP) traffic is sent through a low latency MPLS circuit, while high bandwidth applications that don’t…
We have already discussed packet analysis with tcpdump but will dive deeper in this post! Tcpdump is probably the most popular and capable tool that allows you to dig down to all the bits and bytes of network traffic, including TCP flags. Ngrep, stands for “network grep,” and like its cousin, the…
What is an RFC1918 address? An RFC1918 address is an IP address that is assigned by an enterprise organization to an internal host. These IP addresses are used in private networks, which are not available, or reachable, from the Internet. In fact, one of the basic requirements of the Internet…
Let’s consider the following scenario: you have a Linux host that has more than one network interface, both are routable and both are up and running. How do you determine which interface or route is used when trying to reach another host? In other words the routing table looks like…
G2 Network Monitoring grid I am thrilled to announce that NetBeez was identified as a High Performer in G2’s Winter 2020 Network Monitoring grid. NetBeez was also included in the Top 20 Network Monitoring Software list, holding position number 13, as well as, in the Top 20 Easiest To Use…
This is the last of four posts related to dnsmasq; it covers the basics on how to set up your own DHCP server on your network. For reference, here are the previous dnsmasq posts on DNS caching, a read-only TFPT server, and DNS server. Set Up To install dnsmasq you…
Network Troubleshooting When troubleshooting network problems, it’s very important to keep theOSI model in mind and work your way up from the physical layer to the application layer. This bottom-up approach helps to successfully troubleshoot network problems because each layer relies on the lower one to function properly. In this…
In two previous blog posts we talked about Dnsmasq’s DNS caching and read-only TFTP server set up. Continuing with a third dnsmasq-related post, we’ll talk about how to set up a DNS server in your network. Set Up Literally, all you have to do is install dnsmasq on a host:…
What is Traceroute? Traceroute is an IP utility that discovers all the routers (or “routing hops”) between the source host that issues the command and the destination one. For each router, the command returns its IP address, Fully Qualified Domain Name (FQDN) if available, and Round-Trip Time (RTT) to it….
