On Sat, 27 Jun 2015 07:38:43 -0700, "Bob Evans" said:
What will come first ? A) the earths future core rotation changes altering the ionosphere in such a way that we are all exposed to continuous x-rays that shorten our lifespan OR B) the last IPv4 computer running will be reconfigured to IPv6
Data point: I just ran a tcpdump looking for NTP packets going to 128.173.14.71. In 90 minutes, I got hits from 330 unique IP addresses, including some that were chatty enough to indicate there were dozens of hosts behind a NAT. The biggest offenders: % tcpdump -n -r ~/ntp.dump | cut -f3 -d' ' | cut -f1-4 -d'.' | sort | uniq -c | sort -nr | head -30 reading from file /home/valdis/ntp.dump, link-type EN10MB (Ethernet) 5507 200.195.163.227 3797 74.254.73.226 2989 200.19.200.174 1718 50.129.20.208 1160 200.169.44.45 1119 200.206.35.74 624 201.64.113.34 516 186.215.65.33 352 201.48.247.23 352 187.72.210.97 350 200.171.23.66 281 177.96.208.28 212 187.28.183.82 206 189.22.174.82 200 200.195.127.118 195 187.72.239.145 180 68.213.39.6 180 198.234.129.210 176 201.93.57.129 176 201.90.121.244 176 201.82.103.134 176 201.67.192.74 176 201.59.167.213 176 201.55.163.226 176 201.55.123.98 176 201.48.80.252 176 201.30.191.178 176 201.26.253.187 176 200.250.99.132 176 200.247.208.84 Note that 128.173.14.71 was an IBM RS/6000 taken out of service in June 1999, and we've not re-used the IP address since. So basically, anybody who has tried to get NTP from that address anytime this century has come up empty. The other scary number? % tcpdump -n -r ~/ntp.dump | grep NTP | cut -f6 -d' ' | sort | uniq -c reading from file /home/valdis/ntp.dump, link-type EN10MB (Ethernet) 413 NTPv1, 205 NTPv2, 34900 NTPv3, 2155 NTPv4, I'm not sure which scares me more - that there are boxes on the net *still* running v1 or v2, or boxes that have upgraded to v4 and are blindly using the same ntp.conf without bothering to sanity check if a clock is still usable....