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In computer network protocol design, inter-server communication is an extension of the client–server model in which data are exchanged directly between servers. In some fields server-to-server (S2S) is used as an alternative, and the term inter-domain can in some cases be used interchangeably.

Protocols

Protocols that have inter-server functions as well as the regular client–server communications include the following:

• 
  IPsec, secure network protocol that can be used to secure a host-to-host connection


• The domain name system (DNS), which uses an inter-server protocol for zone transfers;


• The Dynamic Host Configuration Protocol (DHCP);


• 
  FXP, allowing file transfer directly between FTP servers;


• The Inter-Asterisk eXchange (IAX);


• 
  InterMUD;


• The IRC, an Internet chat system with an inter-server protocol allowing clients to be distributed across many servers;


• The Network News Transfer Protocol (NNTP);


• The Protocol for SYnchronous Conferencing (PSYC);


• 
  SIP, a signaling protocol commonly used for Voice over IP;


• 
  SILC, a secure Internet conferencing protocol;


• The Extensible Messaging and Presence Protocol (XMPP, formerly named Jabber).


• 
  ActivityPub a client/server API for creating, updating and deleting content, as well as a federated server-to-server API for delivering notifications and content.

Some of these protocols employ multicast strategies to efficiently deliver information to multiple servers at once.

See also

• Overlay network

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