A decorator pattern implementation that adds IP and Name Resolution capabilities to other transports.
Most libp2p transports use the IP protocol as a foundational layer, and as a result, most transport multiaddrs will begin with a component that represents an IPv4 or IPv6 address.
This may be an actual address, such as /ip4/198.51.100 or /ip6/fe80::883:a581:fff1:833, or it could be something that resolves to an IP address, like a domain name.
DnsAddr attempt to resolve name-based multiaddrs into IP addresses before calling other transports. The current multiaddr protocol table defines four resolvable or "name-based" protocols:
| protocol | description |
|---|---|
| dns | Resolves DNS A and AAAA records into both IPv4 and IPv6 addresses. |
| dns4 | Resolves DNS A records into IPv4 addresses. |
| dns6 | Resolves DNS AAAA records into IPv6 addresses. |
| dnsaddr | Resolves multiaddrs from a special TXT record. |