Filtering ARP traffic with Linux arptables

Filtering ARP traffic with Linux arptables Most Linux system administrators will be familiar with iptables on Linux. Less known is the arptables utility, which controls filtering arp packets. Installation 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. Red Hat / CentOS / Fedora yum install arptables Debian / Ubuntu apt-get install arptables Configuration example To show the effect of filtering […]

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How to clear the ARP cache on Linux?

How to clear the ARP cache on Linux? In some cases, you might need to clear your ARP cache. There are two common ways on Linux, using the arp or ip utility. Depending on your Linux distribution, it might be preferred to use the ip utility. Clearing cache with arp The arp utility does not accept an option to clear the full cache. Instead, it allows to flush out entries found with the -d option. root@ubuntu:~# arp -d 192.168.1.1 After […]

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