netloop-detector

Simple network loop detector based on idea here: https://blogs.cisco.com/networking/preventing-network-loops-a-feature-you-need-to-be-aware-of

compilation

Tested on debian12 linux.

git clone <url> netloop-detector
cd netloop-detector
make

usage

specified interface

./netloop-detector <iface> <timeout_sec>

every interface in the system

./netloop-detector any 5

local test

• A veth pair and a bridge interface will be created.
• Both ends of the veth pair will be added to the created bridge.
• tcpdump will be started on the bridge to capture traffic.
• netloop-detector will run and attempt to detect loops.
• The veth pair and the bridge will be removed after the test.
• The first 10 entries in the resulting PCAP file will be displayed.

make test