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Usage: ping-vs-tcp.pl [opts]
Opts:
-v print this USAGE information
-D debug_level (default=0)
-p protocol (6 or '') (default '')
Function:
Ping the host provided in %NODE_DETAILS
For each host it gets the IP address either from NODE_DETAILS (IPv4)
or using the dig command (IPv6).
it then Pingspings and npings the host with 10 probes and gathers the min, average, maximum
RTTs and losses and reports them to STDOUT, together with a time stamp and host information
such as name, IP address, contrycountry, region etc.
Input:
It gets information on the PingER hosts from %NODE_DETAILS using:
require '/afs/slac/package/pinger/nodes.cf';
Examples:
ping-vs-tcp.pl
ping-vs-tcp.pl -f top-uni.txt
ping-vs-tcp.pl -p 6
ping-vs-tcp.pl -v -D 1
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- IPv4: of the 728 hosts measured 50% have average(RTTs) within 2.15ms of one another.
Another way of looking at the data is to consider the relative differences, i.e. (Avg(ping_RTT)-Avg(nping_RTT)/(0.5(Avg(ping_rtt)+Avg(nping_RTT)), this gives the distribution below that shows the IQR of the averge difference is ~ 1.2%. If one looks at the hosts that have relative differences of > 22% or less than -22% (about 2% of the hosts), we find most are from China or have low RTTs (< 4 msec).
- IPv6: 50% of the 36 hosts measured have average(RTTs) within 0.26ms of oneanother).
Again the relative ping vs nping differences for IPv6 is shown below and shows an IQR of the relative average difference is 0.45%:
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