The OpenSSH suite includes the ssh program which replaces rsh, rlogin and telnet, and scp which replaces rcp and ftp. Rate It PortSentry - Psionic PortSentry is part of the Abacus Project suite of security tools. It is a program designed to detect and respond to port scans against a target host in real-time. It runs on TCP and UDP sockets and works on most UNIX systems. Advanced stealth detection modes are available under Linux only and detect SYN, FIN, NULL, XMAS, and Oddball packet scans.
All modes support real-time blocking and reporting of violations.
Rate It Security Papers - Collection of technical whitepapers concerning network security, traffic analysis, sniffers, routing, DNS management, and armoring Solaris and Linux. It describes suggested steps for responding to a UNIX or NT system compromise. Secure Linux - Trustix Secure Linux is a server oriented Linux distribution with high emphasis on security and performance. Trustix Secure Linux is developed specifically for server applications such as eBusiness servers, web servers, mail servers, file servers and DNS servers, with demand for the highest security and reliability. Trustix provides several support alternatives for users of Trustix Secure Linux.