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Docs: Note that display filter layer numbers start at 1.

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Gerald Combs 2022-06-07 17:01:36 -07:00 committed by A Wireshark GitLab Utility
parent 4015522162
commit 8fa64a4773
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doc/wireshark-filter.adoc
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@ -339,11 +339,11 @@ layer operator (#), followed by a decimal number:
ip.addr#2 == 192.168.30.40
matches only the inner (second) layer in the packet. Layers use simple stacking
semantics and protocol layers are counted sequentially, so tcp#2 is the layer
in the stack somewhere above tcp#1.
matches only the inner (second) layer in the packet.
Layers use simple stacking semantics and protocol layers are counted sequentially starting from 1.
For example, in a packet that contains two IPv4 headers, the outer (first) source address can be matched with "ip.src#1" and the inner (second) source address can be matched with "ip.src#2".
For more complicates ranges the same syntax used with slices is valid:
For more complicated ranges the same syntax used with slices is valid:
tcp.port#[2-4]
@ -456,7 +456,7 @@ Do not confuse this usage of curly brackets with set membership.
An unfortunate quirk in the filter syntax is that the subtraction operator
must be preceded by a space character, so "A-B" must be written as "A -B"
or "A - B".
=== Protocol field references
A variable using a sigil with the form ${some.proto.field} is called a field