scanlogd vs SELKS

scanlogd is a free TCP port scan detection tool for Linux and self-hosted deployments. It captures packets through Linux raw sockets, libnids, or libpcap. The project advises against using libpcap alone when fragmented IP packets matter, recommending libnids for non-Linux systems or monitoring an entire network. The official download page lists release 2.2.8, release files and signatures, an Openwall archive, and source browsing through GitHub. scanlogd is listed in Owl, Debian GNU/Linux, Gentoo Linux, ALT Linux, and OpenWrt, with ports in OpenBSD and FreeBSD collections. A contributed precompiled Win32 build is also linked. The project describes scanlogd as designed to be totally safe to use and points readers to its manual page and a Phrack article. Openwall offers commercial configuration, compilation, and installation support at US $250/hour with a six-hour minimum or US $9,000/week; fixed-price quotes are available for sufficiently specific projects.

SELKS is a free, open-source software package for network intrusion detection and prevention, network security monitoring, and threat hunting, built around Suricata. Its web interface manages Suricata rulesets, threat intelligence sources, custom rules, and IoC data files. Predefined filters and contextual views support threat hunting; thresholding and suppression can help reduce noisy alerts. SELKS 10 includes Suricata, Elasticsearch, Logstash, Kibana, Stamus Community Edition, and functionality from Arkime, Evebox, and CyberChef. It can capture packets tied to detection events and export session PCAP files for investigation or playback in SELKS or other tools. Deployment options include Docker Compose for Linux and Debian-based ISO images, with or without a desktop, on bare metal or a virtual machine. SELKS is licensed under GPL 3.0-or-later. Stamus Networks says it stopped actively enhancing the legacy product on January 1, 2025, and has no future releases planned. The maker says SELKS was not designed for enterprise deployment.