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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Routing without source information and Traffic self-similarity
> Okay... I'll bite... Thanks! ;> > Maybe I am just naive but if the IP header did not contain a source > address, how would TCP acknowledgement, windowing, or re-transmission take > place? > > How would a request for data be serviced? Would responses always be in > the form of a all-nets/all-hosts broadcast? How else would the response > get back to the originating host? The point is that the source address is not explicitly *required* in the *header*. Thus, a source and destination could "setup" an IP session by negotiating a "session ID" or something - the first packet from source to destination would include the source's address in the *payload* along with information to start the negotiation process. I am describing, in other words, something like an ATM transport layer that would live below IP. > [snip] > > Routing Protocols.... we need source addressing so we know, at the IP > layer, who our sources of information are, and then, who can we accept > information from and who we should refuse information from. In addition, > access-lists, route-filters, and other types of security would be > non-functional without source addresses. Now you're addressing (so to speak ;) the kind of issues that I am concerned with: without mandating source information in the header, how can the destination make decisions about rejecting/accepting traffic? alternatively, how can middle agents (e.g., routers) do filtering, etc.? how can we possibly prevent spoofing? > Lastly, how would you accomplish a traceroute on a network with no source > addressing? Where would the ICMP ttl expired messages be directed if > there was no source address in the packet? I don't know! You tell me! Do we make each intermediate router "aware" of the negotiated session ID? Doesn't sound tractable to me. I hope this clarifies this - I don't think it is so strivial as my initial email led you to believe. Cheers, Nate
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