tshark: Difference between -R and -Y

[Joerg Mayer <jmayer () loplof de>]

Hello,

I just found out that I don't understand what -R does.

If I run
tshark -2 -R "udp.port==53" -i wlan0
then it seems that I see all packets (arp, dns, lldp, ...)
if I instead run
tshark -2 -Y "udp.port==53" -i wlan0
I only see dns.
The manpage is not helpful either to explain what I am seeing
(snv HEAD / r54612)

Can someone please explain what is going on here?

Thanks
    Jörg
-- 
Joerg Mayer                                           <jmayer () loplof de>
We are stuck with technology when what we really want is just stuff that
works. Some say that should read Microsoft instead of technology.
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