: bart.cs.columbia.edu ;ping -P 0x06 128.59.1.41
128.59.1.41 is alive
: bart.cs.columbia.edu ;

: bart.cs.columbia.edu ;tcpdump -n -v -v
14:01:42.495425 128.59.19.191 > 128.59.1.41: icmp: echo request (DF) [tos 0x6,ECT(0)]  (ttl 255, id 35729, len 84)
14:01:42.495723 128.59.1.41 > 128.59.19.191: icmp: echo reply (DF) [tos 0x6,ECT(0)]  (ttl 255, id 35729, len 84)