Inter-server
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 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, which uses an inter-server protocol for zone transfers;
- The Dynamic Host Configuration Protocol ;
- FXP, allowing file transfer directly between FTP servers;
- The Inter-Asterisk eXchange ;
- 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 ;
- The Protocol for SYnchronous Conferencing ;
- SIP, a signaling protocol commonly used for Voice over IP;
- SILC, a secure Internet conferencing protocol;
- The Extensible Messaging and Presence Protocol.
- 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.
- SMTP which accepts both MUA->MTA traffic, as well as MTA->MTA, but it is usually recommended that different ports are used for these actions