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:param ifaces: interface dictionary
:param contents: contents of interfaces file
:param src_dir: directory interfaces file was located
:param src_path: file path the `contents` was read
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some confusing output for users manually using ifup/ifdown[1]. To
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route line allowing users to work with ifup/ifdown without using
--force option.
We may at somepoint not want to emit this additional postfix, and
add a 'strict' flag to this function. When called with strict=True,
then we will not append the postfix.
1. http://askubuntu.com/questions/168033/
how-to-set-static-routes-in-ubuntu-server
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