> For the complete documentation index, see [llms.txt](https://diameter.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://diameter.learn-telecom.com/diameter-nodes/diameter-peers.md).

# Diameter Peers

Nodes with a direct TCP or SCTP transport connection are Peers. 

• A node SHOULD have a connection with at least two peers per realm (primary and secondary). 

• Peers may be statically configured or dynamically discovered 

• Static configuration requires: - either the IP address, or - the FQDN (DNS can then resolve FQDN into IP-address) 

• Dynamic discovery based on: - DNS procedures using NAPTR and/or SRV queries 

A new Peer creates an entry in the 

\- Peer Table, and 

\- Routing Table (for other realms) 

Entries created via DNS MUST be refreshed periodically. 

When no transport connection exists with a peer, an attempt to connect SHOULD be made periodically (recommended every 30 s).