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Slow local access using ‘internal network’ on virtual switch

I’ve got quite a complicated network set up on a Red Hat Linux VM running on Hyper-V. The VM has three NICs as follows:

eth0 - external network when using WiFi (DHCP)

eth1 - external network when using wired connection (DHCP)

eth2 - internal network (static 192.168.99.1)

The reason for this is so that my VM can see the Internet whether I’m using WiFi or a wired connection to my router but there are occasions when I need access to my VM from the Windows host when I have no Internet connection available. I have eth2 on Linux
set to 192.168.99.1 and the Hyper-V eEthernet adapter on Windows set to 192.168.99.2. I can then web browse to my application running on the VM.

The problem I have is when I have no Internet connection, the access speeds to my application on the VM are so slow, it’s almost unusable…..but when I do have an Internet connection, the speeds are OK even though I’m still using the local 192.168.99.x
network on my laptop.

Any ideas why it’s so slow accessing my VM with no Internet connection on my laptop but is OK when I do have Internet?

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