Below, a list of RFCs I think, any good network engineer should read.

This list is not definitive and is oriented mainly to security. To read the RFC, you only need to click the following link http://www.ietf.org/rfc.html

  • RFC 791 Internet Protocol
  • RFC 792 Internet Control Message Protocol
  • RFC 1122 Requirements for Internet Hosts
  • RFC 1319 The MD2 Message-Digest Algorithm
  • RFC 1320 The MD4 Message-Digest Algorithm
  • RFC 1321 The MD5 Message-Digest Algorithm
  • RFC 1332 The PPP Internet Protocol Control Protocol
  • RFC 1492 An Access Control Protocol Sometimes Called TACACS
  • RFC 1631 The IP Network Address Translator
  • RFC 1701 Generic Routing Encapsulation (GRE)
  • RFC 1702 Generic Routing Encapsulation over IPv4 networks
  • RFC 1760 The SKEY One-Time Password System
  • RFC 1825 Security Architecture for the Internet Protocol
  • RFC 1826 IP Authentication Header
  • RFC 1827 IP Encapsulating Security Payload (ESP)
  • RFC 1828 IP Authentication using Keyed MD5
  • RFC 1829 The ESP DES-CBC Transform
  • RFC 1918 Address Allocation for Private Internets
  • RFC 2113 IP Router Alert Option
  • RFC 2131 Dynamic Host Configuration Protocol
  • RFC 2138 Remote Authentication Dial In User Service (RADIUS)
  • RFC 2196 Site Security Handbook
  • RFC 2236 Internet Group Management Protocol, Version 2
  • RFC 2246 The TLS Protocol Version 1.0
  • RFC 2251 Lighweight Directory Access Protocol (v3)
  • RFC 2289 A One-Time Password System
  • RFC 2315 PKCS 7 Cryptographic Message Syntax Version 1.5
  • RFC 2341 Cisco Layer Two Forwarding (Protocol) L2F
  • RFC 2350 Expectations for Computer Security Incident Response
  • RFC 2362 Protocol Independent Multicast-Sparse Mode (PIM-SM) Protocol Specification
  • RFC 2401 Security Architecture for the Internet Protocol (Obsolete)
  • RFC 2402 IP Authentication Header
  • RFC 2403 The Use of HMAC-MD5-96 within ESP and AH
  • RFC 2404 The Use of HMAC-SHA-1-96 within ESP and AH
  • RFC 2405 The ESP DES-CBC Cipher Algorithm With Explicit IV
  • RFC 2406 IP Encapsulating Security Payload (ESP)
  • RFC 2407 The Internet IP Security Domain of Interpretation for ISAKMP
  • RFC 2408 Internet Security Association and Key Management Protocol (ISAKMP)
  • RFC 2409 The Internet Key Exchange (IKE)
  • RFC 2410 The NULL Encryption Algorithm and Its Use With IPsec
  • RFC 2411 IP Security Document Roadmap
  • RFC 2412 The OAKLEY Key Determination Protocol
  • RFC 2504 Users Security Handbook
  • RFC 2588 IP Multicast and Firewalls
  • RFC 2616 Hypertext Transfer Protocol
  • RFC 2631 Diffie-Hellman Key Agreement Method
  • RFC 2637 Point-to-Point Tunneling Protocol (PPTP)
  • RFC 2660 The Secure Hypertext Transfer Protocol
  • RFC 2661 Layer Two Tunneling Protocol L2TP
  • RFC 2663 IP Network Address Translator Terminology and Considerations
  • RFC 2780 IANA Allocation Guidelines for Values in the IP and Related Headers
  • RFC 2784 Generic Routing Encapsulation (GRE)
  • RFC 2827 Network Ingress Filtering
  • RFC 2828 Internet Security Glossary
  • RFC 2865 Remote Authentication Dial In User Service (RADIUS)
  • RFC 2866 RADIUS Accounting
  • RFC 2890 Key and Sequence Number Extensions to GRE
  • RFC 2898 PKCS 5 Password-Based Cryptography Specification Version 2.0
  • RFC 2985 PKCS 9 Selected Object Classes and Attribute Types Version 2.0
  • RFC 2986 PKCS 10 Certification Request Syntax Specification Version 1.7
  • RFC 3013 Recommended Internet Service Provider Security Services and Procedures
  • RFC 3078 Microsoft Point-To-Point Encryption (MPPE) Protocol
  • RFC 3174 US Secure Hash Algorithm 1 (SHA1)
  • RFC 3235 Network Address Translator Friendly Application Design Guidelines
  • RFC 3330 Special-Use IPv4 Addresses
  • RFC 3447 Publick-Key Cryptography Standards (PKCS) 1 RSA Cryptography Specifications Version 2.1
  • RFC 3588 Diameter Base Protocol
  • RFC 3704 Ingress Filtering for Multihomed Networks
  • RFC 3748 Extensible Authentication Protocol (EAP)
  • RFC 4017 Extensible Authentication Protocol (EAP) Method Requirements for Wireless LANs
  • RFC 4270 Attacks on Cryptographic Hashes in Internet Protocols
  • RFC 4301 Security Architecture for the Internet Protocol
  • RFC 4302 IP Authentication Header
  • RFC 4303 IP Encapsulating Security Payload (ESP)
  • RFC 4304 ESN Addendum to DOI for ISAKMP
  • RFC 4305 Cryptographic Algortihm Implementation Requirements for ESP and AH
  • RFC 4306 Internet Key Exchange (IKEv2) Protocol
  • RFC 4307 Cryptographic Algorithms for Use in the IKEv2
  • RFC 4308 Cryptographic Suites for IPsec
  • RFC 4309 Using AES CCM Mode with ESP
  • RFC 4507 Transport Layer Security (TLS) Session Resumption without Server-Side State
  • RFC 4634 US Secure Hash Algorithms (SHA and HMAC-SHA)