Dns ttl what is the best value

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AnthonyGeoghegan Modern servers can handle a lot more frequent requests, and now that I'm on highly reliable nameservers AWS Route 53 I'd rather have the flexibility of being able to change DNS at a moment's notice.

Community Bot 1. Both those standards you quote are referring to the "Minimum" field of the SOA record only, which is no longer used for determining the default or minimum TTL anyway, as was intended back when those standards were written.

DNS best practices written 27 and 18 years ago were written when DNS - indeed the internet - was a different beast.

I'm late to comment on this, but it should be noted that it is inappropriate to refer to either of those RFCs as "standards". CloudFlare defaults all their customers' TTLs to seconds 5 mins which is crazy short, but they obviously see benefits. SimonEast can you provide a link to source?

BogdanGusiev See here. They do this so that they can reroute websites quickly during DDOS attacks, and it also makes DNS changes very responsive, with low propagation times. Teddy Teddy 4, 1 1 gold badge 21 21 silver badges 27 27 bronze badges. Peter Green Peter Green 3, 10 10 silver badges 27 27 bronze badges. That's what I use on most zones.

That's probably way too short. For the overwhelmingly vast majority of small i. Of course, if your DNS servers go down for more than 4 hours you're SOL, but if that's important and you can't provide reliable DNS service you have no business hosting your DNS service on such a rickety foundation in the first place When a user asks a question that is answered directly in an RFC you direct them to the RFC regardless of what year it is.

Yes, see my answer above. Sign up or log in Sign up using Google. For the most part, there is no need to change your TTL. However, if you know that you will be making a big DNS change soon, and you want the changes to take effect quickly, you may want to change your TTL ahead of time.

At least 24 hours ahead of time, update your TTL to a shorter value. For example, you may want to change it to 1 hour. When your work is done, be sure to go back and return your TTL settings to their original values. DNS caching is an important way to reduce load on the servers, and it is best to keep this traffic low. This helps ensure your changes will propagate, be recognized on the Internet, more quickly.

The number 0 is not defined in the standard, and it may cause your DNS information to be ignored or rejected. It is low enough for changes to take effect quickly, but not so low that the DNS servers get overloaded. You want to point home. This means the external IP address for your home server will change periodically. Dynamic DNS services are able to point a domain name like home. It will partly depend on how long the lease is on the IP address.

The specifics will vary based on which DNS service you are running, and in some cases which version of Linux or Unix you are running.

Once you have made your changes, you can verify that the changes took effect by querying your server for the new DNS information with the command:. The default TTL is set to four hours 14, seconds :. For example, to edit the file for example. In a typical configuration, the serial number will simply need to be incremented. For example, a serial number of would be updated to Then, it will discuss the factors to consider when deciding on the right TTL for your network.

Finally, it will explore how the TTL-related features of BlueCat Edge can make your network more secure and resilient. Cached information circumvents further steps and more quickly delivers responses to DNS queries. It will have to resolve the DNS query via an authoritative nameserver. For IPv6 addresses, it is called the hop limit. This information is contained in the header field of the packet. It specifies the maximum number of landings on network devices known as hops that the packet can make en route to its destination.

These TTLs and hop limits are measured in seconds. When discarding a packet with a TTL or hop limit of one or zero, a router may send an internet control message protocol ICMP error message to the source. Short TTLs have their advantages. They can increase DNS propagation speeds, help update systems more quickly, and make load balancing more effective.

A very short TTL can tax your downstream servers more than necessary. Depending on the situation, the response for a given query may not change for hours. Constantly pinging for the latest answer is inefficient.