Snort is a libpcap-based sniffer/packet logger. It’s fairly portable and tested on Solaris 2.5.1 (Sparc), Solaris 2.6 (x86), Linux, and FreeBSD.
You can download it from the following link: https://packetstormsecurity.com/files/download/14465/snort-0.96.tar.gz
Source: https://packetstormsecurity.com/files/14465/snort-0.96.tar.gz.html