Disabling IPv6 on *one* network interface in Debian

[Frank Bulk]

I tried that, no luck.  
===================================
iface eth0.100 inet static
       pre-up sysctl -w net.ipv6.conf.eth0/100.autoconf=0
       pre-up sysctl -w net.ipv6.conf.eth0/100.accept_ra=0
       address a.b.c.d
       netmask 255.255.255.0
       network a.b.c.0
===================================

Results in 
	error: "net.ipv6.conf.eth0.100.autoconf" is an unknown key

Of course, once the interface is up, I can execute sysctl manually. To change the autoconf and accept_ra.
	root at nagios:/etc/network#  sysctl -w net.ipv6.conf.eth0/100.autoconf=0
	net.ipv6.conf.eth0/100.autoconf = 0
	root at nagios:/etc/network#  sysctl -w net.ipv6.conf.eth0/100.autoconf=0
	net.ipv6.conf.eth0/100.autoconf = 0
	root at nagios:/etc/network#

Frank

-----Original Message-----
From: Martin Millnert [mailto:martin at millnert.se] 
Sent: Thursday, February 03, 2011 8:51 PM
To: frnkblk at iname.com
Cc: ipv6-ops at lists.cluenet.de; ipv6-techsig at mailman.internetnz.net.nz
Subject: Re: Disabling IPv6 on *one* network interface in Debian

Hi Frank,

On Thu, 2011-02-03 at 20:41 -0600, Frank Bulk wrote:
> Due to our network setup I have asymmetric traffic occurring (post-IPv4 NAT
> result) that can be resolved by disabling IPv6 on one of the server's VLANs.
> I removed the IPv6 addresses manually using "ip -6 addr del <IPv address>
> dev eth0.<VLAN number>" but that will only last until the next reboot.
> 
> Any ideas on how to disable IPv6 on *one* network interface in Debian?  My
> google fu has failed me.
> 
> Frank

http://blog.easter-eggs.org/index.php/post/2010/08/23/Disable-IPv6-autoconfiguration

1. Explicitly load IPv6 module
2. Disable autoconf/accept_ra on the interface you want

HTH,
Martin