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IPv4: Interpretation 2 (Pessimistic case) A node which sees a GIST packet will examine it more closely and see that it is UDP Either regardless of RAO value, or other issues prevent the use of RAO values other than 0; in either case, we can’t use non-zero RAO values to get around this step It will then deliver it to its local UDP stack (which all routers will have) The local UDP stack will discard it since it doesn’t support GIST Discard could be silent or could be ICMP port unreachable In any case, the packet isn’t forwarded ? GIST is broken |