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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Domain names for ISP infrastructure links
> > I'm puzzled. Connections go from router to router. How does it help to say > > routerb-x-y-z-routerc.blah.net when routerc will show up as the next hop in > > the traceroute? > > I think it will help when routerc fails to show up as the next hop :) No. Traceroute gives you the incoming interface on a router. For a given incoming interface on a router there are multiple next hop routers (and multiple outgoing interfaces). Knowing that the outgoing interface that a packet came from on the previous hop router is not worth adding to the DNS. If this is a point-to-point link, as you seem to be assuming, then it should be subnetted as a /30 and you can thus subtract or add 1 to the IP address as appropriate to find the previous hop's outgoing interface, if that information is important to you. If it is a multiple-access link, then there is no chance of the incoming interface being specific to a particular previous hop anyway, so this scheme falls apart. --jhawk - - - - - - - - - - - - - - - - -
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