[dns-wg] lameness and unreachability
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Edward Lewis
edlewis at arin.net
Thu May 22 19:20:34 CEST 2003
At 19:02 +0200 5/22/03, Stephane D'Alu wrote: >In fact the test check for a '-' at the beginning or at the end of >a label as suggested in the grammar of 1035. That section of 1035 is a source of great confusion. Note that the text preceding the parsing rules says: "The following syntax will result in fewer problems with many applications that use domain names (e.g., mail, TELNET)." It doesn't say that the syntax rules are mandatory. In fact, elsewhere: # Because these files are text files several special encodings are # necessary to allow arbitrary data to be loaded. In particular: # # \X where X is any character other than a digit (0-9), is # used to quote that character so that its special meaning # does not apply. For example, "\." can be used to place # a dot character in a label. # # \DDD where each D is a digit is the octet corresponding to # the decimal number described by DDD. The resulting # octet is assumed to be text and is not checked for # special meaning. So, arbitrary octet values are allowed, but isn't 8-bit clean because of the upper==lower case rules. >I don't think there are many anycast server for now, >but the heuristic used to determine the subnet make it already >a policy issue :( > >And I fear that the rise of anycast server will make it really >difficult to check the consistency of the different server for a zone. I've already been slapped by our beloved WG chair (Jim) for the same comment when I accused him of placing both name servers for an ENUM experiment on one LAN. He muttered 'they're anycasted...' >We could provide different list of test, where the degree of completeness >increase. At least a flag to trim back the tests... >These tests are only marked as 'Warning', due to the fact that >if you really know what you are doing you could want to go beyond the >recommanded values. Peter mentioned that there is a RIPE document behind this. I wasn't aware of that. (As an aside, there was a short post meeting discussion about where would we publish operations documents - as in within what venue?) -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Edward Lewis +1-703-227-9854 ARIN Research Engineer Your office is *not* a reality-based sit-com TV show.
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