![]() ![]() If anything, it'll clear out obsolete entries if it hasn't been done in a while and caching is interfering with something, but clearing the cache can actually lower overall speeds (slightly) by requiring new DNS lookups for every resource. It's possible that flushing DNS can have some improvement, but it won't be much. But there's a reason that big professional sites don't ask you to do this - they work around the problem themselves. DNS is one of many factors when it comes to Internet speed. For this, you need to create a batch file on your Windows 11 PC. Using a batch file to sweep the DNS cache is an automated way of performing the task. Easy Peasy Using the Batch File method to clear DNS cache on Windows 11. The solution for the website operators is to have a forwarding "proxy" run on the old IP address, passing traffic to the new IP address, for a couple of days, to give time to deal with the sad reality of stupidly excessive caching.Įither way, the problem has been punted onto you. Now the ‘Run’ command will flush the DNS cache on your PS. This means that a website moving IP address has to actually be available on two different IP addresses for that length of time. ![]() While it's common for caches to have a "lower bound" on how long the timeout can be, it's usually around "5 minutes", not "24 hours". The exception to this is that old Windows releases (through XP? I forget) would ignore timeouts shorter than a day and just remember the old mapping anyway. This needs to be done some time in advance. They moved the service to a new IP address before doing that, they should have lowered some timeouts on the name data in DNS, so that they said something like "this mapping is valid for 5 minutes" instead of "this mapping is valid for the next day". Unless you're on old versions of Windows, it means that the website operators messed up. ![]()
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