[c-nsp] what the heck is "ip forward-protocol nd" good for

Mattias Gyllenvarg mattias at gyllenvarg.se
Thu Apr 7 07:03:52 EDT 2016

Yeah, This was discussed some time ago when they where planning on IOS 15
and checked what we wanted here on the list.

I asked for a global "modern standards/defaults" but no go.
Or legacy-default-off.
Nothing fancy, just like the above. No proxy-arp etc etc, stuff left behind
the last millenia.

ons 6 apr. 2016 kl 18:51 skrev Saku Ytti <saku at ytti.fi>:

> On 6 April 2016 at 19:16, Sebastian Beutel
> <sebastian.beutel at rus.uni-stuttgart.de> wrote:
> Hey,
> >     So i asked wisdom of the search engines and found out, that there
> once
> > was a protocol with the name "sun-nd" and the ip protocol number 77,
> used in
> > suns diskless sun 2 stations. The line "ip forward-protocol nd" seems to
> be
> > the equivalent for sun-nd what ip-helper is for dhcp. Could this be? A
> > workaround for a 30 year old proprietary legacy protocol is in the
> default
> > configuration of a modern router? This is what i found:
> Helper is for any number of protocols iterated by 'ip
> forward-protocol'. Usually as you say DHCP (BOOTP).
> Cisco (and other vendors) are in difficult position when it comes to
> default settings. You ship with some config, and no matter how crazy
> they are, changing them will break something from someone.
> I think one solution to this would be to support multiple
> standard/default settings, and your config would have line about which
> standard you are using. If there is nothing, it's using the latest
> available in that image. This way people could choose when they adopt
> more modern standards and as vendors and customers learn how things
> should be configured, it would be lower barrier to introduce new
> standard.
> Basically this standard release would be just be config over which
> user config is merged on, likely very simple concept for ios-xr,
> junos, but perhaps not so simple for classic ios.
> --
>   ++ytti
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