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Date:	Wed, 3 Oct 2012 10:09:51 -0400
From:	David Stevens <>
To:	Eric Dumazet <>
Cc:, Dave Jones <>,
	David Miller <>,,
	Julian Anastasov <>,,
Subject: Re: [PATCH] udp: increment UDP_MIB_NOPORTS in mcast receive

Eric Dumazet <> wrote on 10/03/2012 09:15:51 AM:
> So when a host receives an UDP datagram but there was no application
> at the destination port we should increment udpNoPorts, and its not
> an error but just a fact.

        Of course. I think our difference is on the definition of 
I don't think a packet delivered locally due to promiscuous mode, 
or an imperfect multicast address filter match is a host UDP datagram 
These packets really shouldn't be delivered to UDP at all; they are not
addressed to this host (at least the non-broadcast, no-membership ones).
        A unicast UDP packet that doesn't match a local IP address does 
increment this counter. A promiscuous mode multicast delivery is no 
except that the destination alone doesn't tell us if it is for us.

        I think counting these will primarily lead to administrators 
non-zero drops and wasting their time trying to track them down.


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