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[Feature Request] DHCP/RA (optional) restart when link down-to-up transition detected. #1344

Description

@jmcmullan

Is your feature request related to a problem? Please describe.

When a NetworkInterface's link state transitions from down to up, it should be possible to request the stack to immediately restart DHCP or RA address discovery. Currently, there does not seem to be an automatic
method to detect this nor manually request the stack to restart the DHCP/RA discovery state on a specific network interface.

Describe the solution you'd like

Either a NetworkInterface option to automatically restart the DHCP/RA discovery when link state goes up, or to have a public API that can be used to request that the stack restart address discovery on a specific NetworkInterface.

Describe alternatives you've considered

Currently, the public API makes it appear that I have to restart the stack for all network interfaces to have this occur.

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