libxt_tos.man revision e37d45ce390c2f5a7f1e64742b9100ecef0def54 
1This module matches the 8-bit Type of Service field in the IPv4 header (i.e.
2including the "Precedence" bits) or the (also 8-bit) Priority field in the IPv6
3header.
4.TP
5[\fB!\fP] \fB\-\-tos\fP \fIvalue\fP[\fB/\fP\fImask\fP]
6Matches packets with the given TOS mark value. If a mask is specified, it is
7logically ANDed with the TOS mark before the comparison.
8.TP
9[\fB!\fP] \fB\-\-tos\fP \fIsymbol\fP
10You can specify a symbolic name when using the tos match for IPv4. The list of
11recognized TOS names can be obtained by calling iptables with \fB\-m tos \-h\fP.
12Note that this implies a mask of 0x3F, i.e. all but the ECN bits.
13