> I would like to change the IP address (netmask, gateway etc.) of an Interface
> (eg. fxp0) from within my C source code.
> 
> 1. Is this possible to do without the SIOC ioctl call? (i am already in the
> kernel).

Make the call from within the kernel.

> 2. Which structure and which member should I write the new information to
> (ifaddr?)?

Call the ioctl, which will do whatever needs to be done.

-- 
\\  The mind's the standard       \\  Mike Smith
\\  of the man.                   \\  msm...@freebsd.org
\\    -- Joseph Merrick           \\  msm...@cdrom.com




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