Hot Knowledge Sharing: The Difference Between SOCKS4 and SOCKS5

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SOCKS4 and SOCKS5 are different versions of the SOCKS protocol, and the main differences are in the supported protocols, authentication methods, and security.
1. Protocol support
SOCKS4 only supports TCP protocol, while SOCKS5 supports TCP and UDP protocols. This means that SOCKS5 can proxy more types of applications, including games, VoIP, and streaming media.

2. Authentication method
SOCKS4 only supports username/password authentication, while SOCKS5 supports multiple authentication methods, including username/password authentication, SOCKS5 proxy server authentication, and SSH tunnel authentication. This makes SOCKS5 more secure and flexible.

3. Security
SOCKS4 does not provide any encryption function, so data packets may be eavesdropped during transmission. SOCKS5 supports SSH tunnel authentication, which can encrypt data packets to improve security.

4. Other differences
SOCKS5 also supports server-side domain name resolution, which can improve the performance of the proxy server.
SOCKS5 can proxy IPv6 addresses, while SOCKS4 can only proxy IPv4 addresses.