The difference between pasegueno and burbon system is burbon system is for valid for blocking too many threads creation, too many postings, and too many reading requests (crawling) to a server in a short period time(using ● or not), thus helps to decrease server overloads and works as a tool against vandals as a side effect.
<Another speculation> I think Jim-san may added a tool to modify .htaccess for doing "deny from [host name]" to the bbspink side servers instead of changing httpd.conf value.
When Apache process [deny from host name] in a .htaccess list, it does reverse DNS lookups for ALL accesses in order to match the list. even if HostNameLookups in httpd.conf was off.
2ch servers were not made such a way, since reverse DNS lookups of all accesses results severe performance penalty. 2ch handles and writes tools for "deny from [IP address]" only in the past and won't change it in a future. <Speculation end>
>>221 The trouble happened just after >>191-193, but as >>215 says, the poisoning of main reload(reading) burbon IP list with host names instead of IP address was the cause. The poisoning may have gone slow and did not cause fatal error until now if pink servers were using host names for about a year now.
>>224 ipv6...hmm...ipv6.2ch.net is around for about a year for testing purpose. But it seems that it is not popular among users. Very little ISP supports ipv6 in Japan and will take years for typical consumers to use it in common.
If ipv6 <-> ipv4 address conversion can be done without performance penalty and has proven reliabity, it might be worth checking for them. In my opinion, 2ch is very conservative as far as network is concerned though.
>>228 One more opinion, if you would like to put the burbon system back to bbspink server: There must be a file that contains ip address list to pass it to burbon system when F22(burbon main server) requests it every 10 minutes. If you are going to fix something, please make sure that the file does not include any host names in it. If you have no idea which one is the correct file, it is a better idea to ask for it to root-san.