In this video, Chaim Krause introduces the concept of time to live or TTL. Explore how to set default TTL for a zone configuration file on Linux. Learn about BIND's special naming options.
- [Instructor] The first entry in the zone configuration…file is usually the time to live or the $TTL record.…The record sets the default TTL…for all records in the same file.…So, this TTL is always used unless…explicitly overridden by specific record.…Valid TTLs are in seconds and the maximum…is a non practical number equaling about 68 years.…I highly recommend that you work…with more reasonable time frames…like a maximum of 2.4 million seconds…which is about four weeks.…
It is also recommended that you make the duration…at least one whole day or 86,400 seconds.…Time to live is the duration that a record can be kept…under the worst circumstances before it must be…discarded and no longer considered viable.…With the default TTL of 2.4 million seconds…if you can not get a fresh answer…from the authoritative server after close to a month…then you should stop assuming the record is accurate.…The Syntax for the line is $TTL…followed by the number of seconds.…
For example, on a line by itself…we have $TTL and 172,800 seconds.…
- Working with different types of name servers
- Working with zone files
- Setting up a basic name server
- Creating, verifying, loading, and testing the zone file
- Allowing queries from localnets
- Configuring an advanced name server
- Serving a website or email
- Adding security
Skill Level Intermediate
Linux: Multitasking at the Command Linewith Scott Simpson39m 1s Intermediate
1. Installing BIND
Installing BIND1m 4s
2. Types of Name Servers
3. Zone Configuration File
4. Basic Name Server Setup
5. Advanced Name Server Setup
6. Security Concerns
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.Cancel
Take notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.