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doc: properly escape non-hyphens
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@@ -1,18 +1,19 @@
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This module matches the length of a packet against a specific value or range of
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values.
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.TP
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[\fB!\fR] \fB--length\fR \fIlength\fR[\fB:\fR\fIlength\fR]
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[\fB!\fR] \fB\-\-length\fR \fIlength\fR[\fB:\fR\fIlength\fR]
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Match exact length or length range.
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.TP
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\fB--layer3\fR
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\fB\-\-layer3\fR
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Match the layer3 frame size (e.g. IPv4/v6 header plus payload).
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.TP
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\fB--layer4\fR
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\fB\-\-layer4\fR
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Match the layer4 frame size (e.g. TCP/UDP header plus payload).
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.TP
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\fB--layer5\fR
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\fB\-\-layer5\fR
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Match the layer5 frame size (e.g. TCP/UDP payload, often called layer7).
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.PP
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If no --layer* option is given, --layer3 is assumed by default. Note that using
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--layer5 may not match a packet if it is not one of the recognized types
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(currently TCP, UDP, UDPLite, ICMP, AH and ESP) or which has no 5th layer.
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If no \-\-layer* option is given, \-\-layer3 is assumed by default. Note that
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using \-\-layer5 may not match a packet if it is not one of the recognized
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types (currently TCP, UDP, UDPLite, ICMP, AH and ESP) or which has no 5th
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layer.
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