| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <2212b090-559a-2f0b-8190-29401205402d@spamtrap.tnetconsulting.net>
Date: Wed, 20 Jun 2018 09:38:35 -0600
From: Grant Taylor <gtaylor@...tconsulting.net>
To: netdev <netdev@...r.kernel.org>
Cc: lartc <lartc@...r.kernel.org>
Subject: Re: Route fallback issue
On 06/20/2018 09:18 AM, Grant Taylor wrote:
> Where can I find more information on ignore_routes_with_linkdown? I
> don't see it listed in $Kernel/Documentation/networking/ip-sysctl.txt.
> (I do see fib_multipath_use_neigh documented there in.)
I'm specifically interested in if ignore_routes_with_linkdown and / or
fib_multipath_use_neigh will cause Linux to fall back to an alternate
(higher metric) route if the link is still up but the neighbor is not
accessible across it.
+-------+
| Linux |
+---+---+
|
+-----+ +---+----+ +-----+
| R 1 +---+ Switch +---+ R 2 |
+-----+ +--------+ +-----+
A typical scenario is where Linux is connected to a DSL or Cable modem
where the physical link stays up even if the neighbor R {1,2} goes
offline. It's not possible to rely on the local link (MII) status to
determine that a neighbor is not reachable. I.e. R 1 going away like below.
+-------+
| Linux |
+---+---+
|
+-----+ +---+----+ +-----+
| R 1 X X Switch +---+ R 2 |
+-----+ +--------+ +-----+
--
Grant. . . .
unix || die
Download attachment "smime.p7s" of type "application/pkcs7-signature" (3982 bytes)
Powered by blists - more mailing lists