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The /etc/ethers file may contain any number of white space characters between the mac address and the IP/hostname field, so extend the pattern to allow for that. Man ethers(5) also states that the IP field may be a symbolic hostname, so test whether the name is an IP address or hostname before adding it to the hints structure. Fixes #1674. Signed-off-by: Jo-Philipp Wich <jo@mein.io>