IPQoS

[Saku Ytti]

Real networks use either PREC (as it maps 1:1 to 802.1p and MPLS TC) or DSCP.
Interactive SSH uses PREC 0x0, which is just best-effort and DSCP 0x4 which
has no standard meaning (found network where DSCP 0x4 was dropped, completely,
as it didn't hit any defined/allowed QoS class, obviously misconfig, BE class
should eat anything not already defined)

Should interactive use TOS value which has highest chance for priority
behaviour? If so, then PREC 5 == DSCP CS5 is best bet.

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  ++ytti