netdev - Re: [BUG] Dependence of routing cache entries on the ignore-df flag

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Date: Wed, 3 May 2023 11:35:28 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Aleksey Shumnik <ashumnik9@...il.com>
Cc: netdev@...r.kernel.org, waltje@...lt.nl.mugnet.org, Jakub Kicinski
 <kuba@...nel.org>, gw4pts@...pts.ampr.org, kuznet@....inr.ac.ru,
 "willemdebruijn.kernel@...il.com" <willemdebruijn.kernel@...il.com>,
 gnault@...hat.com
Subject: Re: [BUG] Dependence of routing cache entries on the ignore-df flag

On Wed, 3 May 2023 18:01:03 +0300
Aleksey Shumnik <ashumnik9@...il.com> wrote:

> Might you answer the questions:
> 1. How the ignore-df flag and adding entries to the routing cache is
> connected? In which kernel files may I look to find this connection?
> 2. Is this behavior wrong?
> 3. Is there any way to completely disable the use of the routing
> cache? (as far as I understand, it used to be possible to set the
> rhash_entries parameter to 0, but now there is no such parameter)
> 4. Why is an entry added to the routing cache if a suitable entry was
> eventually found in the arp table (it is added directly, without being
> temporarily added to the routing table)?

What kernel version. The route cache has been completely removed from
the kernel for a long time.