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R0http://www.faqs.org/patents/img/20090213867_02.png from "BLADE ROUTER WITH NAT SUPPORT"ROmay have stood forRoute Optimization. benedikt-stockebrand.de/ipv6-in-practice-index_de.html not sure.R0candidate may be fromR0..Rnsequence for marking hops inlabel-switched path (LSP) tunnelfrom cisco. also hashead-endas one end of anLSR. latter seems to stand forLabel switch router. this sounds the most likely.R0possibilities areRequest 0as inD0forData 0, "for a stop-and-wait type of request/response protocol". unlikely.