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arping(8) [centos man page]

ARPING(8)						 System Manager's Manual: iputils						 ARPING(8)

arping - send ARP REQUEST to a neighbour host SYNOPSIS
arping [-AbDfhqUV] [-c count] [-w deadline] [-s source] -I interface destination DESCRIPTION
Ping destination on device interface by ARP packets, using source address source. OPTIONS
-A The same as -U, but ARP REPLY packets used instead of ARP REQUEST. -b Send only MAC level broadcasts. Normally arping starts from sending broadcast, and switch to unicast after reply received. -c count Stop after sending count ARP REQUEST packets. With deadline option, arping waits for count ARP REPLY packets, until the timeout expires. -D Duplicate address detection mode (DAD). See RFC2131, 4.4.1. Returns 0, if DAD succeeded i.e. no replies are received -f Finish after the first reply confirming that target is alive. -I interface Name of network device where to send ARP REQUEST packets. -h Print help page and exit. -q Quiet output. Nothing is displayed. -s source IP source address to use in ARP packets. If this option is absent, source address is: o In DAD mode (with option -D) set to o In Unsolicited ARP mode (with options -U or -A) set to destination. o Otherwise, it is calculated from routing tables. -U Unsolicited ARP mode to update neighbours' ARP caches. No replies are expected. -V Print version of the program and exit. -w deadline Specify a timeout, in seconds, before arping exits regardless of how many packets have been sent or received. In this case arping does not stop after count packet are sent, it waits either for deadline expire or until count probes are answered. SEE ALSO
ping(8), clockdiff(8), tracepath(8). AUTHOR
arping was written by Alexey Kuznetsov <>. It is now maintained by YOSHIFUJI Hideaki <>. SECURITY
arping requires CAP_NET_RAW capability to be executed. It is not recommended to be used as set-uid root, because it allows user to modify ARP caches of neighbour hosts. AVAILABILITY
arping is part of iputils package and the latest versions are available in source form at rent.tar.bz2. iputils-121221 10 June 2014 ARPING(8)

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CLOCKDIFF(8)						 System Manager's Manual: iputils					      CLOCKDIFF(8)

clockdiff - measure clock difference between hosts SYNOPSIS
clockdiff [ -o] [ -o1] destination DESCRIPTION
clockdiff Measures clock difference between us and destination with 1 msec resolution using ICMP TIMESTAMP [2] packets or, optionally, IP TIMESTAMP option [3] option added to ICMP ECHO. [1] OPTIONS
-o Use IP TIMESTAMP with ICMP ECHO instead of ICMP TIMESTAMP messages. It is useful with some destinations, which do not support ICMP TIMESTAMP (f.e. Solaris <2.4). -o1 Slightly different form of -o, namely it uses three-term IP TIMESTAMP with prespecified hop addresses instead of four term one. What flavor works better depends on target host. Particularly, -o is better for Linux. WARNINGS
o Some nodes (Cisco) use non-standard timestamps, which is allowed by RFC, but makes timestamps mostly useless. o Some nodes generate messed timestamps (Solaris>2.4), when run xntpd. Seems, its IP stack uses a corrupted clock source, which is synchro- nized to time-of-day clock periodically and jumps randomly making timestamps mostly useless. Good news is that you can use NTP in this case, which is even better. o clockdiff shows difference in time modulo 24 days. SEE ALSO
ping(8), arping(8), tracepath(8). REFERENCES
[1] ICMP ECHO, RFC0792, page 14. [2] ICMP TIMESTAMP, RFC0792, page 16. [3] IP TIMESTAMP option, RFC0791, 3.1, page 16. AUTHOR
clockdiff was compiled by Alexey Kuznetsov <>. It was based on code borrowed from BSD timed daemon. SECURITY
clockdiff requires CAP_NET_RAWIO capability to be executed. It is safe to be used as set-uid root. AVAILABILITY
clockdiff is part of iputils package and the latest versions are available in source form for anonymous ftp ing/iputils-current.tar.gz. iputils-020927 27 September 2002 CLOCKDIFF(8)

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