message too long, mtu=1460 --- ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms $ ping -4 -c 1 -s $((1460-28)) -M do www.debian.org PING (130.89.148.77) 1432(1460) 77): icmp_seq=1 ttl=50 time=325 ms --- ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 325.318/325.318/325.318/0.000 ms $ ping -6 -c 1 -s $((1500-48)) ttl=47 ←� time=191 ms --- www.debian.org ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms Debian リファレンス 114 / 259 rtt min/avg/max/mdev = 191.332/191.332/191.332/0.000 ms