把日常遇到的一些常用协议RFC收集如下：

IP

IPv4

• RFC 791
• RFC 919
• RFC 922
• RFC 950

IPv6

• RFC 2373

ICMP

• RFC 792

UDP

• RFC 768

TCP

• RFC 793

SMTP

• RFC 2821

Telent

• RFC 854
• RFC 855

FTP

• RFC 959

DNS

• RFC 1034
• RFC 1035

HTTP

HTTP 1.1

• RFC 2616

当前RFC 2616已经被更新了，HTTP 1.1的协议被分为几个RFC：

• RFC7230 - Message Syntax and Routing - low-level message parsing and connection management
• RFC7231 - Semantics and Content - methods, status codes and headers
• RFC7232 - Conditional Requests - e.g., If-Modified-Since
• RFC7233 - Range Requests - getting partial content
• RFC7234 - Caching - browser and intermediary caches
• RFC7235 - Authentication - a framework for HTTP authentication

HTTP 2

• RFC 7540

SIP

• RFC 2543

RTP/RTCP

RTP与RTCP都定义在同一协议中：

• RFC 3550 : A Transport Protocol for Real-Time Applications
• RFC 6184 : RTP Payload Format for H.264 Video