Allows you to select a TOS/DSCP value to mark outgoing
	connections with, based on where the reply was sourced.

	TOS values really only have local significance - so you should
	know what you're specifying. For more information, see RFC2474,
	RFC2475, and RFC3260.

	The TOS/DSCP byte must be exactly that - octet value 0x00-0xFF.
	Note that in practice often only values up to 0x3F are usable
	as the two highest bits have been redefined for use by ECN
	(RFC3168).

	This setting is configured by setting the source TOS values:

	local-hit=0xFF		Value to mark local cache hits.

	sibling-hit=0xFF	Value to mark hits from sibling peers.

	parent-hit=0xFF		Value to mark hits from parent peers.


	NOTE: 'miss' preserve feature is only possible on Linux at this time.

	For the following to work correctly, you will need to patch your
	linux kernel with the TOS preserving ZPH patch.
	The kernel patch can be downloaded from http://zph.bratcheda.org

	disable-preserve-miss
		By default, the existing TOS value of the response coming
		from the remote server will be retained and masked with
		miss-mark. This option disables that feature.

	miss-mask=0xFF
		Allows you to mask certain bits in the TOS received from the
		remote server, before copying the value to the TOS sent
		towards clients.
		Default: 0xFF (TOS from server is not changed).