https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208241
Bug ID: 208241
Summary: [Hyper-V] VM network may not work over virtual switch
based on wireless NIC
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: de...@microsoft.com
I tried FreeBSD 11-CURRENT VM on Windows 10 host and found the VM network could
easily stop working about 5 minutes after the VM finished bootup.
After some debugging, it seems the host virtual switch has some issue for
wireless NIC. It seems if we change the default ARP expiration time from the
default 1200 seconds to 60s, the issue will disappear.
Details about the workaround:
Add "net.link.ether.inet.max_age=60" into /etc/sysctl.conf and reboot the VM.
Or, "sysctl net.link.ether.inet.max_age=60" and "arp -d -a".
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