DNS

Delegation

Explanatory review

• Where do cs.utahtech.edu servers get authority?

• Where did you get authority for the it.cit.utahtech.edu subdomain?

• Where did you get authority for your domain?

• What information had to be given to registrar for delegation?

  • Name and ip of each authoritative server.

Delegation

• Most registrars require at least 2 authoritative servers
• Delegation, or glue, records link the DNS hierarchy together.
• Caching lookup servers receive the glue records to recurse through the hierarchy.

Lessee Steps (Person wanting to get a subdomain)

• Arrange for subdomain from registrar
• Configure one authoritative master
• Configure one or more authoritative slaves
• Give authoritative server information to registrar
• Test.

Lessee Notes

• Its ok for new names to point to existing addresses
  • i.e. ns1.games.horgoth.com and ns1.dsutux.us both have same IP (A record)
• We can have A records for IPs that aren't used yet
• Slave and master are set up same way we set up previously

Registrar Notes

• Agree to delegate
  • What subdomain will you use?
• Receive information from client
  • subdomain name, names and ips of clients authoritative servers
• Add a NS and A record to zone file
  • Increment serial
  • These are the glue records
• Restart bind
• Test master and slave
• Fix errors