Ip

The network configuration is a common place to start during system configuration, security audits, and troubleshooting. It can reveal useful information like MAC and IP addresses. This guide helps you to gather this information on Linux, including listing all available network interfaces and its details. Show network interfaces Linux Every Linux distribution is using its own way of configuring the network configuration details. Therefore, it is good to know which tools can be used to query these details in a generic way.

Most Linux system administrators will be familiar with iptables on Linux. Less known is the arptables utility, which controls filtering arp packets. Installation of arptables The arptables utility is easy to set-up, as the main functionality is already implemented in the Linux kernel. Just install the arptables package on your favorite Linux distribution. Debian / Ubuntu: apt install arptables Red Hat: yum install arptables Configuration example To show the effect of filtering traffic, we will show an example by filtering router traffic and blocking it.

There are several reasons when you might need to clear your ARP cache. There are two common ways on Linux systems, typically using the arp or ip utility. Depending on your Linux distribution and the availability, we suggest using the ip tool. Clearing cache with ip Newer Linux distributions have the ip utility. The ip tool has a more advanced way to clear out the full ARP cache. ip -s -s neigh flush all