netdev - Re: Kernel UDP behavior with missing destinations

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Message-ID: <18aefee7-4c47-d330-c6c1-7d1442551fa6@gmail.com>
Date:   Thu, 16 May 2019 09:14:31 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Adam Urban <adam.urban@...leguru.org>
Cc:     Network Development <netdev@...r.kernel.org>
Subject: Re: Kernel UDP behavior with missing destinations



On 5/16/19 9:05 AM, Eric Dumazet wrote:

> We probably should add a ttl on arp queues.
> 
> neigh_probe() could do that quite easily.
> 

Adam, all you need to do is to increase UDP socket sndbuf.

Either by increasing /proc/sys/net/core/wmem_default

or using setsockopt( ... SO_SNDBUF ... )