netdev - Re: [PATCH net-next] net: Evict neighbor entries on carrier down

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Message-Id: <20181012.094929.855844907752350108.davem@davemloft.net>
Date:   Fri, 12 Oct 2018 09:49:29 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dsahern@...nel.org
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        idosch@...lanox.com, dsahern@...il.com
Subject: Re: [PATCH net-next] net: Evict neighbor entries on carrier down

From: David Ahern <dsahern@...nel.org>
Date: Thu, 11 Oct 2018 20:33:49 -0700

> From: David Ahern <dsahern@...il.com>
> 
> When a link's carrier goes down it could be a sign of the port changing
> networks. If the new network has overlapping addresses with the old one,
> then the kernel will continue trying to use neighbor entries established
> based on the old network until the entries finally age out - meaning a
> potentially long delay with communications not working.
> 
> This patch evicts neighbor entries on carrier down with the exception of
> those marked permanent. Permanent entries are managed by userspace (either
> an admin or a routing daemon such as FRR).
> 
> Signed-off-by: David Ahern <dsahern@...il.com>

Applied.