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Operating Systems Solaris ARP Cache
# 8  
Old 06-30-2007
Quote:
Originally Posted by Neo
No, that is not actually correct.

If the IP address of the destination is on the same LAN segment as the origin, then when you send the first packet to that designation, the ARP tables on that LAN segment will update.

However, if your destination is 2 hops away, then there will be no ARP entry for the destination address.

ARP is for mapping IP address to MAC addresses for LAN traffic, not for IP routing.

Just doing a DNS lookup will not update an ARP table.

For example, right now you sit down and you want to visit www.unix.com .
There is no ARP entry on your server for www.unix.com because your computer is not on the same LAN segment as www.unix.com.

Is this clear now?
Yes, thanks to both of you.
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LEARN ABOUT DEBIAN

arpsend

arpsend(8)							    Containers								arpsend(8)

NAME

       arpsend - send ARP requests

SYNOPSIS

       arpsend -D -e target_ip [ -e target_ip ...]  [-c count] [-w timeout] interface

       arpsend -U -i source_ip [-c count] [-w timeout] interface

DESCRIPTION

       Utility arpsend sends ARP packets on device interface to detect or update neighbours' ARP caches with a given IP.

COMMANDS

       Run utility with one of the following commands:

       -D     Send broadcast ARP request to detect neighbours with target_ip. You have to specify target_ip (-e option).

       -U     Send broadcast ARP request to update neighbours' ARP caches with source_ip. You have to specify source_ip (-i option).

OPTIONS

       -c count
	      Number of packets to send. Default is infinity.

       -w interval
	      Interval between packets, in seconds. Default is 1 second.

       -i source_ip_address
	      Set source IP address field in ARP packet.

       -e target_ip_address
	      Set  target  IP  address	field in ARP packet. Note that you can specify -e option multiple times to detect many IP addresses in one
	      utility call.

EXIT STATUS

       arpsend returns 0 upon successful execution. If something goes wrong, it returns an appropriate error code.

       1    EXC_USAGE
	      Usage error

       2    EXC_SYSTEM
	      System error

       3    EXC_RECV
	      ARP reply was received

EXAMPLES

       To send request on interface eth0 to detect any neighbour computers with IP 192.168.10.200:

	  arpsend -D -e 192.168.10.200 eth0

       To send request on interface eth0 to update neighbours' ARP caches with IP 192.168.10.200:

	  arpsend -U -i 192.168.10.200 eth0

NOTES

       Interface you use have to be arpable and not be loopback (i.e.  /sbin/ip link show interface should show neither NOARP nor  LOOPBACK  flags
       in interface parameters).

SEE ALSO

       vzctl(8).

LICENSE

       Copyright (C) 2000-2011, Parallels, Inc. Licensed under GNU GPL.

OpenVZ								    28 Jun 2011 							arpsend(8)