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website/content/docs/linking.md

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Server links

echoIRCd links to other servers — and to echo services — over a standard server-to-server protocol, wire-compatible with the InspIRCd 1206 protocol.

Server identity

Every server needs a unique SID (three characters, the first a digit) and a name.

network "echoiRCd";
sid     "0AA";

A link block

Each link block describes a peer: its name, address, port, and the passwords used to authenticate the connection in each direction.

listen { ip "[::]"; port 7700; type server; }

link {
    name         "hub.example.net";
    ip           "203.0.113.10";
    port         7700;
    sendpassword "outbound-secret";
    recvpassword "inbound-secret";
}

Treat link passwords as secrets, and restrict the server port to trusted peers.

Services

echo services connect as a special linked server. In the ircd, mark the services server name as a U-lined server (and as the SASL server) so its privileged commands and SASL relay are accepted:

uline { server "services.echoircd.org"; }
sasl_server "services.echoircd.org";

See Services for the services side of the link.