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Slow Chrome on Windows 11 behind Opnsense firewall
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Topic: Slow Chrome on Windows 11 behind Opnsense firewall (Read 1289 times)
jevon_nl
Newbie
Posts: 2
Karma: 0
Slow Chrome on Windows 11 behind Opnsense firewall
«
on:
December 29, 2023, 08:45:13 pm »
I recently installed an Opnsense system at home as my home network firewall.
I am working with the default settings for the firewall and most other parts of OpnSense.
For some reason when I now open a new website in Chrome on Windows 11, it takes a couple of seconds to load the initial website , but is quite fast after that. When I do the same on a local Linux PC, the website loads almost instantly.
When I connect directly to the Internet, the problem disappears, so it somehow seems to be related to the OpnSense gateway.
Could it be a firewall issue?
Did anyone notice similar behavior and does anybody have any ideas how I can resolve this?
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bartjsmit
Hero Member
Posts: 2005
Karma: 193
Re: Slow Chrome on Windows 11 behind Opnsense firewall
«
Reply #1 on:
December 30, 2023, 09:37:20 am »
Wireshark will tell you what is happening on the client:
https://www.wireshark.org/
Install it on Windows and capture the first few seconds. You can also capture the OPNsense traffic and analyse it with Wireshark: Interfaces: Diagnostics: Packet Capture
It's DNS though
https://i.etsystatic.com/22516705/r/il/66f860/2469964138/il_fullxfull.2469964138_26oq.jpg
Bart...
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jevon_nl
Newbie
Posts: 2
Karma: 0
Re: Slow Chrome on Windows 11 behind Opnsense firewall
«
Reply #2 on:
January 03, 2024, 03:02:19 pm »
Hello Bart,
I did make a Wireshark trace and didn't spot any obvious problems.
So I had to dig a bit deeper
Then I saw a lot of DNS requests for wpad.[mydomain.com] and they were actually being forwarded to my domain registrar for resolving. Because that probably doesn't resolve to anything that makes sense to Windows, I can imagine that slows things down quite a bit.
I now manually override the wpad subdomain in unbound DNS on my Opnsense box and that seems to solve the issue. The Opnsense documentation actually states that there is a "WPAD records" button in the unbound DNS config, but I couldn't find it. Has it been removed ?
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bartjsmit
Hero Member
Posts: 2005
Karma: 193
Re: Slow Chrome on Windows 11 behind Opnsense firewall
«
Reply #3 on:
January 03, 2024, 03:28:48 pm »
No idea, sorry. I don't use unbound
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cookiemonster
Hero Member
Posts: 1821
Karma: 95
Re: Slow Chrome on Windows 11 behind Opnsense firewall
«
Reply #4 on:
January 03, 2024, 03:46:50 pm »
I don't use it so no idea if does what you want but it is in Unbound DNS | General. Need to click on the "Show advanced option" button at the bottom.
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CJ
Hero Member
Posts: 832
Karma: 29
Re: Slow Chrome on Windows 11 behind Opnsense firewall
«
Reply #5 on:
January 04, 2024, 02:54:54 pm »
You shouldn't need to set an override for WPAD. Do any of your other machines have this issue?
Can you do a packet capture from OPNsense and post it here? Limit it to just when you open a new site.
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