From owner-freebsd-net@FreeBSD.ORG  Wed Mar  7 07:10:41 2012
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From: hiren panchasara <hiren.panchasara@gmail.com>
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Subject: Network Interface configuration
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Do we store network interfaces configuration information in any file that
survives reboots? (as Linux does it in /etc/network/interfaces)

Only thing I could find was when an interface needs address from DHCP,
rc.conf says ifconfig_em0="DHCP".

I know getifaddrs() can get you list of interfaces but I wanted to know if
there is any such file.

Thanks,
Hiren