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#306644 9-Aug-2023 19:55
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I have been debugging a super odd issue an issue with a HP Elitebook 840 G8 or newer and any of the new HP device fleet for over a month. And the colleagues I am assisting have been trying to find the root cause for months. HP have come back with a fix but I am interested to know if this problem exists on other non-HP hardware as their theory was it should as it is an underly Windows 10/11 Modern Standby issue.


If you first you need to have a modern Intel Gen 10 or newer laptop with Standby (S0 Low Power Idle) Network Connected. If it says Standby S3 then this issue doesn't occur.



Then if you are using the Cisco AnyConnect (or Fortigate VPN, as both SSL VPNs have this issue) and first you ping your hostname when off then VPN, then ping it again when on the VPN. If this was working as expected then your computer should resolve the IP address allocated via the VPN tunnel. But what happens is the IP address of your home network is resolved and you get a General Failure as you can't contact your internal adapter when the VPN tunnel is up.



If you then disable on the adapter you are using the "NS offload" or similar setting then the ping does work as expected resolving the hostname the IP address of the tunnel.



Anyone else using non HP hardware that has the above Standby S0 powercfg. Ideally already have a SSL VPN either Cisco or Fortigate and could quickly test this. Or I can message anyone offline with a test client and VPN endpoint to test with.


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  #3113978 10-Aug-2023 06:23
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I've got the S0 Modern Standby on an XPS 13 9360 with Intel AC-8265 chipset - looks like I must have the modern standby network connectivity disabled at present. However, have migrated to ZTNA as SSL VPNs seem to be ticking time bombs 😁


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  #3115183 12-Aug-2023 21:20
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Linus Tech Tips has been ranting about broken modern standby for a while. Relevant Google Search:

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  #3115224 13-Aug-2023 09:48
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I’ve noticed you’ve added the -4 flag to force ipv4

A windows laptop, on a network with ipv6 will use that as a preference for dns lookups.
When you connect to your vpn the Cisco software blocks ipv6 locally, breaking those lookups.
You’ll find for example this occurs when the laptop is connected to a home router with ipv6 from their isp and not when hotspotting off a mobile as that doesn’t have ipv6

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  #3115288 13-Aug-2023 15:23
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Thanks for that @BlakJak as I wasn't aware of it. Posted into the thread about it as I wonder if NS Offload setting would also resolve (or reduce the severity of) the laptop being drained issue.


And the IPv6 vs V4 that is also what I have noticed, even if you don't have IPv6 working properly via your ISP if you are getting IPv6 PD from your router then doing a "ping hostname" will always prefer IPv6.


I haven't tried having a dual Cisco VPN stack and testing the G6 vs G8 and if the ping properly resolves the /64 or /128 or whatever gets assigned via the VPN tunnel over the local adapter. As many folks know I have an issue in general with IPv6 as it often just complicates things and makes networking twice as hard for little or no benefit and often times making things much worse for end users.  




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