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

Sebastian Beutel sebastian.beutel at rus.uni-stuttgart.de
Wed Apr 6 12:16:08 EDT 2016

Hi List,

    so... i have here this brand new c6880x running 15.2(1)SY1a and in it's
default configuration i found this strange string "ip forward-protocol nd".
My first thought was, that this has something to do with v6's neighbor
discovery. But for what use would one forward this anywhere? 
    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:

Router(config)#default ip forward-protocol nd
Router#show running-config | include forward
ip forward-protocol nd

What do you think: Is this a bug?


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