Syntax rules for filter on Tethereal

Hello,
 I have an issue relevant to "field match" not to the "value match".
Only to clarify my meaning of "field" and "value", for me the filter
expression is:
field operator value

The issue is that, for each packet ethereal and tethereal looks for a field
that contain the words I write as field. I need that ethereal and tethereal
looks for a field that exactly match it.

In particular, here I am with an example:
... -R ip.len==24
This filter does not match not only ip.len equal to 24
but also
icmp.mip.length==24
ncp.ip.length==24
and so on

because the field "icmp.mip.length" contains the word "ip.len".

How can I write the filter to have only ip.len?

Thanks in advance

Alberto C.

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