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DNS\website lookup is all of a sudden slow when connected to VPN???

5,621 1,257 June 22, 2020 at 12:17 PM
Running Windows 10 Pro, 64 bit with Ipvanish VPN. Have a 220mbps internet connection. All is fine when the VPN is off. When I turn it on, website look ups can often take 10 seconds or more to resolve. No errors reported, just slow DNS resolution and then everything seems fine speed-wise once on the site. Tried on 2 PCs, one with Norton and one with Mcafee as the IS\AV. Same issue. Both show DNS servers as the ipvanish ones. Anyone have any idea what could be causing it?

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#2
Quote from YanksIn2009
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Running Windows 10 Pro, 64 bit with Ipvanish VPN. Have a 220mbps internet connection. All is fine when the VPN is off. When I turn it on, website look ups can often take 10 seconds or more to resolve. No errors reported, just slow DNS resolution and then everything seems fine speed-wise once on the site. Tried on 2 PCs, one with Norton and one with Mcafee as the IS\AV. Same issue. Both show DNS servers as the ipvanish ones. Anyone have any idea what could be causing it?
Your VPN service probably sucks. (This could be a temp problem, you didn't state if your vpn service is brand new or if you've had it a while and for some reason today it sucks at dns)

One other thing to try is to take 1 of your pc's to someone else's house.

Try it without the vpn, then with it.

Slows down again? yes. Then it's your VPN provider.
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#3
Quote from DC
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Your VPN service probably sucks. (This could be a temp problem, you didn't state if your vpn service is brand new or if you've had it a while and for some reason today it sucks at dns)

One other thing to try is to take 1 of your pc's to someone else's house.

Try it without the vpn, then with it.

Slows down again? yes. Then it's your VPN provider.
Had the vpn service for years and ipvanish is one of the better rated ones. And as I stated, the speed is fine it is just the DNS\website lookup that all of a sudden is slow. Can't really take my desktops to someone else's house.
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#4
Quote from YanksIn2009
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Had the vpn service for years and ipvanish is one of the better rated ones. And as I stated, the speed is fine it is just the DNS\website lookup that all of a sudden is slow. Can't really take my desktops to someone else's house.
Well you've ruled out if it's a pc as both are having the same probelm.
Can't rule out your home infrastructure or your ISP, but my money would be on the VPN provider cause when you don't use them, your PC's are fine...which more of less rules out your infrastructure, but isn't definitive since you can't try it on a friends setup.
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Last edited by DC June 22, 2020 at 06:49 PM. Reason: out
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#5
Quote from DC
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Well you've ruled out if it's a pc as both are having the same probelm.
Can't rule out your home infrastructure or your ISP, but my money would be on the VPN provider cause when you don't use them, your PC's are fine...which more of less rules out your infrastructure, but isn't definitive since you can't try it on a friends setup.

Yeah I would agree, though I do not know what could be the issue outside of some firewall rules maybe that could have changed though hard to see that happening on two separate machines and you would think it would just stop the whole thing from working not just slow down DNS resolution. The router is not setup for vpn either and the connection comes from the windows client app for the service.

The other weird part is the wireless stuff I run through the service (phone and tablet) do not seem to have the issue. I put in a ticket with the vpn provider and they are basically asking me to turn off advanced program control in Norton and see what happens. Sort of reluctant to go down that path as I think they are just taking a stab in the dark and I do not know what it would prove.
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#6
Have you tried multiple web browsers?

If you're using firefox, a recent update enabled "DNS over HTTPS" (DoH) defaulting to cloudflare servers. Maybe they don't like your VPN. You can disable this under Network Settings (at the bottom of the General preferences) or change what servers it uses.

I don't think Chrome has enabled DoH by default yet, so if you're using Chrome, that probably isn't the problem.
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#7
Quote from UpbeatJuice8080
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Have you tried multiple web browsers?

If you're using firefox, a recent update enabled "DNS over HTTPS" (DoH) defaulting to cloudflare servers. Maybe they don't like your VPN. You can disable this under Network Settings (at the bottom of the General preferences) or change what servers it uses.

I don't think Chrome has enabled DoH by default yet, so if you're using Chrome, that probably isn't the problem.
Also, tried it with IE and Edge with the same results. I checked and Firefox does not have DoH on.
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#8
Follow up: I switched to using a wireless 5Ghz connection to the same router and the PC internet\DNS works fine then with the VPN, no lag.

Only thing I can think of is the PCs when wired are going through a Netgear GS908e managed switch with default settings. Not seeing any errors on the switch and can't figure out why that would cause DNS lookup to slow down via the VPN. Unfortunately I do not have a spare switch to switch the Netgear one out with to see if it is isolated solely to this switch or not.
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#9
Quote from YanksIn2009
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Follow up: I switched to using a wireless 5Ghz connection to the same router and the PC internet\DNS works fine then with the VPN, no lag.

Only thing I can think of is the PCs when wired are going through a Netgear GS908e managed switch with default settings. Not seeing any errors on the switch and can't figure out why that would cause DNS lookup to slow down via the VPN. Unfortunately I do not have a spare switch to switch the Netgear one out with to see if it is isolated solely to this switch or not.
That is totally weird, but it is what it is.
Glad to hear you have some resolution to the problem.
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#10
Quote from DC
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That is totally weird, but it is what it is.
Glad to hear you have some resolution to the problem.

Yeah I have no idea why. I need to get a spare unmanaged switch and swap it out when I get the chance. Something is going on but I have no idea what it could possibly be. I did notice the switch had IGMP Snooping turned on (no idea why), so I turned it off, but that did not have any effect.
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#11
Quote from YanksIn2009
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Yeah I have no idea why. I need to get a spare unmanaged switch and swap it out when I get the chance. Something is going on but I have no idea what it could possibly be. I did notice the switch had IGMP Snooping turned on (no idea why), so I turned it off, but that did not have any effect.
To me, the switch would be about the same as a cable causing your dns issues...

I sure hope you'll update this when you can swap it out.
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