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List:       linux-netdev
Subject:    Re: (usagi-users 00729) Re: [Patch 2of2] IPv6 routers don't
From:       Peter Bieringer <pb () bieringer ! de>
Date:       2001-08-29 6:37:15
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--On Wednesday, August 29, 2001 03:25:42 PM +0900 "YOSHIFUJI Hideaki
/ =?iso-2022-jp?B?GyRCNUhGIzFRTEAbKEI=?=" <yoshfuji@linux-ipv6.org>
wrote:

> In article <15990000.999065086@localhost> (at Wed, 29 Aug 2001
> 08:04:46 +0200), Peter Bieringer <pb@bieringer.de> says:
> 
>> > BTW, ip6_forward() in net/ipv6/ip6_output.c checks 
>> > ipv6_devconf.forwarding only.  
>> > It seems we should check idev_of_input_device->cnf.forwarding,
>> > too...
>> 
>> Attention: afaik there are different meanings of this switch 
>> "per device" has different meaning than "per IPv6" on setting.
> 
> Yes, but
> 
> 
>> Forwarding switching per device is currently not implemented,
>> control has another meaning (sets isRouter on advertisements).
> 
> If a node forwards, it should announce NA with is_router set, IMHO.

I had a discussion with Pekka some time ago in which he find out,
what the settings are really do.

Control the flag isRouter can be needed if a router has more than 2
interfaces and one of them is a stub network for which the router
should not announce that he is a router.

Behavior is like KAME at the moment.


Thread around May 02, 2001
-- 8<-- (itojun on usagi-users)
        in KAME stack, the only legal combination is:
                accept_rtadv=0, forwarding=1    router
                accept_rtadv=1, forwarding=0    autoconfigured host
                accept_rtadv=0, forwarding=0    manually configured
host

        1/1 combination is not prohibited, just for experimental
purposes.
        we are not trying to promote configuration like 1/1.
        (netbsd /etc/rc.d/network prohibits 1/1).
-- >8--


BTW: afair in IPv4 (where the forwarding-per-device switch has a
different meaning) this switch is checked on packet input on that
device, not on output.


        Peter

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