DNS Reference

DNS server administration (BIND9 on VyOS dual-HA), query tools, zone management, and troubleshooting.

Topics

Topic	Description
dig	DNS query tool — record lookups, tracing, DNSSEC, batch queries
nslookup	Legacy lookup tool — cross-platform, interactive mode, Windows/PowerShell
BIND	BIND9 server configuration — options, zones, records, rndc, logging
named	named daemon — service management, rndc, file permissions, diagnostics
Records	DNS record types — A, AAAA, CNAME, MX, NS, SOA, PTR, SRV, TXT, CAA
Zones	Zone files — forward, reverse, serial management, transfers, validation
Server Types	Authoritative, recursive, forwarding, master, slave, stub, stealth
Authoritative	Authoritative-only servers — master/slave HA, SOA design, delegation
Recursive	Recursive resolvers — caching, root hints, security, rate limiting
Caching	DNS cache — inspection, flushing, client-side cache, TTL strategy
Forwarders	Forwarding configuration — global, per-zone, VyOS dual-BIND architecture
Split-Horizon	Split-brain DNS — BIND views, internal/external zones, testing
DNSSEC	DNSSEC — validation, trust chains, DNSKEY, DS, RRSIG, troubleshooting
Troubleshooting	Systematic DNS debugging — reachability, records, cache, delegation

Topic

Description

DNS query tool — record lookups, tracing, DNSSEC, batch queries

Legacy lookup tool — cross-platform, interactive mode, Windows/PowerShell

BIND9 server configuration — options, zones, records, rndc, logging

named daemon — service management, rndc, file permissions, diagnostics

DNS record types — A, AAAA, CNAME, MX, NS, SOA, PTR, SRV, TXT, CAA