systemd/hwdb.d/82-net-auto-link-local.hwdb

# This file is part of systemd.

# Network interfaces for which only Link-Local communication (i.e. IPv4LL, …)
# makes sense, because they almost certainy will point to another host, not an
# internet router.

# (Note: matches against drivers go into 82-net-auto-link-local.rules instead)

# Prolific USB-to-USB links (https://www.prolific.com.tw/US/ShowProduct.aspx?pcid=43)
usb:v067Bp25A1*
usb:v067Bp27A1*
 ID_NET_AUTO_LINK_LOCAL_ONLY=1
hwdb,rules: mark host-to-host network devices as only requiring link local addressing This is a generalization of this logic: https://github.com/NetworkManager/NetworkManager/blob/main/data/90-nm-thunderbolt.rules It applies not just to thunderbolt, but to any kind of device, even matched by vendor/product, via hwdb. I added two entries for Prolific PC-to-PC devices (of which I have one lying around). 2023-10-30 15:53:59 +00:00			`# This file is part of systemd.`

			`# Network interfaces for which only Link-Local communication (i.e. IPv4LL, …)`
			`# makes sense, because they almost certainy will point to another host, not an`
			`# internet router.`

			`# (Note: matches against drivers go into 82-net-auto-link-local.rules instead)`

			`# Prolific USB-to-USB links (https://www.prolific.com.tw/US/ShowProduct.aspx?pcid=43)`
			`usb:v067Bp25A1*`
			`usb:v067Bp27A1*`
			`ID_NET_AUTO_LINK_LOCAL_ONLY=1`