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VPN issues on Sky Max hub

mwarby

Super Pro Member
Has anyone else had issues with VPN on Skye using the new white Max hub, but not with a sky q hub ?

My work VPN (AOVPN) used to work with our old sky account (account holder moved and cancelled it). Our new account came with the new white hub max. We don't use the built in WiFi but have a WiFi mesh.

The VPN fails with error 809 which work IT claim is sky blocking(broadband shield is off)

Swapping the modem back to the old one results in VPN working

The only thing I can think of is that MAP-T IP address sharing is causing an issue
 
Has anyone else had issues with VPN on Skye using the new white Max hub, but not with a sky q hub ?

My work VPN (AOVPN) used to work with our old sky account (account holder moved and cancelled it). Our new account came with the new white hub max. We don't use the built in WiFi but have a WiFi mesh.

The VPN fails with error 809 which work IT claim is sky blocking(broadband shield is off)

Swapping the modem back to the old one results in VPN working

The only thing I can think of is that MAP-T IP address sharing is causing an issue
There's been quite a few different reports about issues with the Max Hub, I wouldn't be surprised if this is also an issue with it.
 
Looks like MAP-T can cause fragmentation issues running the command below allowed the VPN to connect

netsh interface ipv4 set subinterface 'Name of the interface" mtu=1472 store=persistent

Not sure if it affects the performance, will consult with work IT further
 
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Looks like MAP-T can cause fragmentation issues running the command below allowed the VPN to connect

netsh interface ipv4 set subinterface 'Name of the interface" mtu=1472 store=persistent

Not sure if it affects the performance, will consult with work IT further
1472 MTU generally consists of 1500 MTU as there's a 28 buffer. In some extreme cases it can show a fairly tangible performance uplift not just in upload speeds or download speeds but also ping times.
 
Looks like MAP-T can cause fragmentation issues running the command below allowed the VPN to connect

netsh interface ipv4 set subinterface 'Name of the interface" mtu=1472 store=persistent

Not sure if it affects the performance, will consult with work IT further
That tracks. Your machine expects 20 bytes of IPv4 overhead when there's actually 40, IPv6, and your IKE traffic is getting fragmented.

Your IT folks could configure the VPN concentrator and clients, if necessary, to support IKE v2 fragmentation. See: https://directaccess.richardhicks.com/2019/02/11/always-on-vpn-and-ikev2-fragmentation/
 
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