netdev - Re: GRE devices and MULTICAST flag.

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Message-ID: <4E7CEF4D.6080309@candelatech.com>
Date:	Fri, 23 Sep 2011 13:42:53 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	netdev <netdev@...r.kernel.org>
Subject: Re: GRE devices and MULTICAST flag.

On 09/23/2011 12:56 PM, Ben Greear wrote:
> I was under the impression that GRE tunnels could support MULTICAST
> traffic, but the MULTICAST flag is not set. This is making the xorp
> router crap out because it checks the MULTICAST flag and will
> not start multicast on the interface if it's not set....
>
> Is it supposed to be set?
>
> 7: gre0: <NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN
> link/gre 0.0.0.0 brd 0.0.0.0
> 8: netb: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN
> link/gre 192.168.100.223 peer 192.168.100.138
> inet 10.0.1.1/32 scope global netb

Well, ifconfig netb multicast seems to add the flag,
so maybe all is as it should be.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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