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andywoodrow
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Message 1 of 10
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DNS servers delay in refreshing

I've made some nameserver changes on a web domain and DNS has been updated successfully, however, when trying to browse the URL at home my virgin cable network, it still points to the old hosting.  If i turn off wifi and hit 4G, I get the new hosting perfectly fine, so my question is, how long does it take for Virgin DNS servers to replicate or does anyone know if there could be a problem?  Looks like it's a regular thing with Virgin?!  Cheers. 

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Dave_cq
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Message 2 of 10
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Re: DNS servers delay in refreshing

Why would you still be using Virgin Media's DNS servers, they are a joke.   Use Google DNS or OpenDNS instead.

 

********* SuperHub 2ac - Asus rt-ac68u Router - Vivid 100Mbps **********

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Superuser
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Message 3 of 10
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Re: DNS servers delay in refreshing


andywoodrow wrote:

how long does it take for Virgin DNS servers to replicate 


Up to 72 hours

- - - - - -
Any opinions expressed by myself are entirely my own and do not represent Virgin Media in any way.
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legacy1
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Message 4 of 10
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Re: DNS servers delay in refreshing

Its takes as long as the TTL in VM DNS cache which VM may extend which seems unlikely.

Also windows has a DNS cache which you can disable in Services so DNS will be direct from the apps.

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cybmole
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Message 5 of 10
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Re: DNS servers delay in refreshing


Dave_cq wrote:

Why would you still be using Virgin Media's DNS servers, they are a joke.  ...

 

 Because folks with a virgin hub in router mode, and no IT skills, have no control over?

( I agree with you, I use open dns on all devices;  just saying it's not something your average grannie would know how to bypass.

i don't know of any 1 click app which runs on all of windows, apple, android... & which can be trusted to automate the change

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Dave_cq
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Message 6 of 10
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Re: DNS servers delay in refreshing

Yes, fair comment cybmole.  It really should be made so much easier to change such a fundamental setting.

 

 

********* SuperHub 2ac - Asus rt-ac68u Router - Vivid 100Mbps **********

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Superuser
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Message 7 of 10
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Re: DNS servers delay in refreshing

It really depends on what TTL you set on the original record and when Virgin last downloaded the record from your DNS server.

Lets say you have a typical TTL of 86400 - (24 hours) - This means that if Virgin queries the master records it will cache the entry for 24 hours, and once that period has expired - will look up the record again, at which point it will pick up any changes.

If you are expecting to change a DNS record it's best to plan ahead and actually reduce the TTL a few days before the change, then once the change is done you can increase it back to 24 hours again.

Most registrars quote 48-72 hours for changes to be propagated across the net as a whole, because of DNS caching.

Ravenstar68

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cybmole
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Message 8 of 10
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Re: DNS servers delay in refreshing

I did find a dns changer utility one time when I was frequently using netflix proxies, but I never actually trusted it enough to use it  -  I felt safer with manual changes -  and though it claimed to be one-click it had to be carefully configured in advance. 

 I expect any such utility would need admin privileges to run in windows ?, I am not sure if a standard user account is even allowed to edit network adapter properties

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legacy1
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Message 9 of 10
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Re: DNS servers delay in refreshing


ravenstar68 wrote:

Most registrars quote 48-72 hours for changes to be propagated across the net as a whole, because of DNS caching.


will normally be less then that. 

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Superuser
Superuser
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Message 10 of 10
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Re: DNS servers delay in refreshing

Agreed, I'm sure I've seen up to 72 hours quoted previously.  Although certainly 123 reg now says 24-48 hours.  But depending on the last time the Virgin server cached the entry it is often much sooner.

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