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Re: Setting DSCP for IPv6 Neighbor Discovery packets

On 10-07-07 08:41 AM, Greg Troxel wrote:
> Patrik Lahti<>  writes:
>> I'm of the opinion that IPv6 Neighbor Discovery packets are network
>> control packets and hence they should be prioritized accordingly. In
>> fact, network control should probably be the highest priority.
> At most they are internetwork control (old tos 6); network control is
> about the layer used by the internetworking layer.

Yes, I think you're right.

>> Currently Neighbor Discovery traffic is sent using the default (Best
>> Effort, i.e. zero) DSCP value, and e.g. if other higher traffic (lets
>> say a lot of voice traffic) is competing for bandwidth then it may
>> cease to function correctly potentially leading to all sorts of havoc.
> What do the standards say?  What do other operating systems do?

AFAICT the standards are open to interpretation as to what is internetwork control.

I think I've seen routers set DSCP 0xe0 on ND packets, but not hosts.


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