Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!psuvax1!psuvax1!flee From: flee@shire.cs.psu.edu (Felix Lee) Newsgroups: news.software.b Subject: Re: cancel propagation Message-ID: Date: 1 Sep 89 04:41:03 GMT References: <5200@looking.on.ca> <536@logicon.arpa> <3246@deimos.cis.ksu.edu> <1989Aug30.174430.20687@anise.acc.com> <1989Aug31.034105.2177@utstat.uucp> <6233@looking.on.ca> Sender: news@psuvax1.cs.psu.edu Organization: Penn State University Computer Science Lines: 12 Host Cat gets a cancel for an article it doesn't have yet, so doesn't send the cancel to Dog. Dog gets the article from Fish, and sends it further, when it could have stopped if Cat had forwarded the cancel. And Dog might never receive the cancel, if the Fish-Dog link ever loses articles for any reason. I can see a cancel stopping an article within two hops of the origin, except for one link that loses the cancel and spreads the article to the rest of the network. -- Felix Lee flee@shire.cs.psu.edu, *!psuvax1!flee