netdev - ipv4_devconf.arp

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Message-ID: <d0383f90712230800n6e6d6b92x64eaa8dcff313915@mail.gmail.com>
Date:	Sun, 23 Dec 2007 18:00:57 +0200
From:	"Ian Brown" <ianbrn@...il.com>
To:	netdev@...r.kernel.org
Subject: ipv4_devconf.arp_accept mystery

Hello,
I have a question regarding unsolicited ARPs in ipv4/arp.c

As I understand, by default this feature is disabled;
How can one set this feature ?

When working with ipv4_devconf.arp_accept is 0 by default.
This is with 2.6.21 kernel.

I wanted ipv4_devconf.arp_accept to be set to 1.

I added:
net.ipv4.conf.default.arp_accept = 1
net.ipv4.conf.eth0.arp_accept = 1
in /etc/sysctl.conf
and rebooted.

I have:
cat /proc/sys/net/ipv4/conf/default/arp_accept
=> 1
cat /proc/sys/net/ipv4/conf/eth0/arp_accept
=>1

Yet ,the printk() I added shows that ipv4_devconf.arp_accept shows 0 !!

Could it be that this variable could not be set ? or is it dependent
upon other things ?

BTW, in newer kernel version we have IPV4_DEVCONF_ALL(ARP_ACCEPT)
instead. So if anybody knows how to set this macro (instead)to be 1, it will be
also fine.

Ian
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