Security and TCP/IP Servicess

1. Using TCP/IP Services
   • TCP
   • IP
   • UDP
   • Telnet (telent venus.nmhu.edu 79)
   • FTP
   • SMTP
2. IP Names
3. IPv6 addresses some of the security related limitations of IPv4 (32-bit address -> 128-bit address)
4. IPSEC - adds encryption, authentication, & key management (at the network layer)
   • AUTHENTICATION HEADER - adds authentication info to the IP datagram (calculated using MD5 or SHA-1)
   • ENCAPSULATING SECURITY PAYLOAD - adds integrity and confidentiality to IP datagrams
   • INTEROPERABILITY
5. TCP Wrappers - moves network services to another location and puts the tcpd in its place and the changes are recorded in /etc/inetd.conf:
   telnet stream tcp nowait root /usr/sbin/in.telnetd becomes
   telnet stream tcp nowait root /usr/sbin/tcpd /usr/sbin/in.telnetd