azurelinuxagent/common/osutil/default.py [776:791]:
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                    logger.warn('Primary interface examination will retry silently')
                    self.disable_route_warning = True
        else:
            logger.info('Primary interface is [{0}]'.format(primary_interface))
            self.disable_route_warning = False
        return primary_interface

    def is_primary_interface(self, ifname):
        """
        Indicate whether the specified interface is the primary.
        :param ifname: the name of the interface - eth0, lo, etc.
        :return: True if this interface binds the default route
        """
        return self.get_primary_interface() == ifname

    def is_loopback(self, ifname):
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azurelinuxagent/common/osutil/freebsd.py [381:396]:
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                logger.warn('Primary interface examination will retry silently')
                self.disable_route_warning = True
        else:
            logger.info('Primary interface is [{0}]'.format(primary_interface))
            self.disable_route_warning = False
        return primary_interface

    def is_primary_interface(self, ifname):
        """
        Indicate whether the specified interface is the primary.
        :param ifname: the name of the interface - eth0, lo, etc.
        :return: True if this interface binds the default route
        """
        return self.get_primary_interface() == ifname

    def is_loopback(self, ifname):
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