You can see these TTL values for yourself with the nslookup command. I always tell my users it'll be 48 hours for full propagation, to compensate for all the issues mentioned above. Besides the TTL something that you control, see Brian Clapper's excellent advice , and possible longer caching times inside some applications, there is also the synchronization time between the authoritative name servers.
If you're talking Windows and you're talking internal, it depends on the original TTL. When we knew ahead of time that we were going to make a change, we would set the TTL on the A record low Then once the change was made, we increased the TTL back to a more normal amount. If you're talking about on the Internet, all bets are off. There are some caching domain controllers that we have seen completely ignore TTL, as already mentioned. In those cases we've gone with a general rule of 48 hours.
I've seen on average hours for most people. However, i still use 7 days as a rule of thumb for a complete changeover. My experience is that DNS changes can take upwards of eight or more hours, but this is all dependant on how long a client will cache their DNS settings. Most clients will work with the TTL that you set. I recently changed the IP addresses of our web sites. We had to leave servers up and running on the old IP addresses for weeks in order to respond to requests.
It could be greater than the TTL of the replaced record: Many clients ignore the TTL when its too low, or bound it to some other value like an hour. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Asked 12 years, 10 months ago. Active 9 months ago. Flushing your own local DNS cache can help speed up the process. More information on how to flush your local cache based on the OS you are using can be found in the articles below:. What is DNS propagation and why does it take so long? Changes to the DNS records or name servers of your domain.
During the first 48 hours, even if you are able to see your site on the new server, your next-door neighbor might still be seeing the site on the old server. The routing of all communication between computers on the internet is handled by IP address rather than domain names.
The following example should help you to visualize the process. Similar to our telephone system, every active phone line has a phone number that is used to facilitate the connection of one line to another. In order to make a call, the phone that initiates the connection must have the number of the line to which it wants to connect.
In much the same way, your computer must find the correct IP address of the website you want to visit on the server before it can send the request to that server for a webpage. The same process applies to all other services such as email, chat, or games on the internet. DNS records function similar to a phone book, relating domain names with IP addresses so that these services can be reached. DNS hosts hold the zones for their domains and answer requests with the records from the zones for those domains.
When you make changes to your zone, you are making changes to the host. A resolver is a DNS server that will send requests to other DNS servers for the records from their zones in an attempt to answer the requests that it receives. These sorts of requests are called recursive requests. When you connect to the internet through your Internet Service Provider ISP , your ISP will provide you with two or more resolvers that will be responsible for handling the recursive DNS requests sent by your computer as you use the internet.
Propagation is the period it takes for the record cached on all resolvers everywhere to expire. In each record in the zone, there is a Time To Live TTL value that specifies in seconds how long a resolver should cache the record. One technique to reduce the time it takes for changes to propagate is to reduce the TTL value in the current zone prior to making changes, however, the change in the TTL on the record itself will take the length of time specified in the original TTL value to propagate before propagation period is lowered for further changes.
Also, some ISPs configure their resolvers to ignore the TTL value specified in the record altogether and cache the record for a length of time that they specify instead. Some resolvers are configured to cache records for up to 72 hours, although most are configured for less. Ultimately, time resolves propagation issues. All Answers. Hey there ireshmadushanka , DNS changes can take anywhere from hours to completely process.
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