Men and Mice

DNS Q&A Corner

Questions & Answers on DNS.

The answers are provided by world leading experts on DNS including Cricket Liu, the author of "DNS & BIND". Click on the appropriate question below to see its answer.

• A hidden primary master
• Can an MX record point to an alias?
• Can I add a CNAME record and an MX record for a single domain name?
• Can I disable caching without disabling recursion?
• Can I make the domain name of my zone an alias?
• Can I register my name server by more than one name, with a single IP address?
• Can I run a name server behind a fractional T1?
• Can I set a TTL on a specific record?
• Can I use a hidden primary?
• Can I use allow-query in a forward zone?
• Can I use an A record instead of an MX record?
• Can I use an alias for the name of my name server?
• Can I use forwarders with internal root name servers?
• Can I use views to separate my recursive name server and authoritative name servers?
• Can my BIND 4 name server transfer a zone from a BIND 8 name server?
• Can name servers ignore TTLs?
• Different domain names in the same reverse-mapping zone.
• DNS server behind a firewall
• DNS server performance is insufficient
• Do slaves only communicate with their masters
• Does dynamic update automatically add PTR reocrds?
• Does the Microsoft DNS Server support per-zone forwarding?
• Have you seen this INSIST error?
• How are the SOA record's fields used?
• How do I handle reverse mapping with virtual domain names?
• How do I restrict queries to internal hosts?
• How do I secure a Microsoft DNS Server?
• How do I set up rndc.conf and named.conf to allow remote control of my name server?
• How do I update multiple views?
• How do I use a load balancer with my name servers?
• How do people on the Internet find my name server?
• How does reverse mapping work?
• Is it acceptable to place a private address in a public name server?
• Is my configuration messed up?
• Is reverse mapping dangerous?
• My servers are on private IP addresses. How do I make them accessible to both internal and external clients?
• NOTIFY and the Microsoft DNS Server.
• Setting up a DNS server
• Turning round robin off selectively.
• What are a zone's NS records used for?
• What are reverse (PTR) records? Why do I need them?
• What are the pros and cons of running slaves versus caching-only name servers?
• What do I put in the MNAME field of the SOA record for 0.0.127.in-addr.arpa?
• What happens if one of my name servers is down?
• What is a lame delegation or lame response? How do I fix it?
• What version of BIND is the Microsoft DNS Server equivalent to?
• What's a good tool for stress testing a name server?
• What's the largest number I can use in an MX record?
• Where does this CNAME record belong?
• Why are there only 13 root name servers?
• Why are these name servers responding non-authoritatively?
• Why don't my $INCLUDE control statements work?
• Why is my BIND 9.2.0 name server slow at resolving queries?
• Why is this old address still being given out?
• Why isn't my logging statement working?