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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 V7

arp

arp(1M)                                                   System Administration Commands                                                   arp(1M)

NAME

       arp - address resolution display and control

SYNOPSIS

       arp hostname

       arp -a [-n]

       arp -d hostname

       arp -f filename

       arp -s hostname ether_address [temp] [pub] [trail]

DESCRIPTION

       The arp program displays and modifies the Internet-to-MAC address translation tables used by the address resolution protocol (see arp(7P)).

       With  no flags, the program displays the current ARP entry for hostname. The host may be specified by name or by number, using Internet dot
       notation.

OPTIONS

       -a       Display all of the current ARP entries. The definition for the flags in the table are:

                M        Mapping; only used for the multicast entry for 224.0.0.0

                P        Publish; includes IP address for the machine and the addresses that have explicitly been added by the -s option. ARP will
                         respond to ARP requests for this address.

                S        Static; not learned for the ARP protocol.

                U        Unresolved; waiting for ARP response.

                You  can  use the -n option with the -a option to disable the automatic numeric IP address-to-name translation. Use arp -an or arp
                -na to display numeric IP addresses.

       -d       Delete an entry for the host called hostname. This option may only be used by the super-user.

       -f       Read the file named filename and set multiple entries in the ARP tables. Entries in the file should be of the form:

                hostname MACaddress [temp] [pub] [trail]

                See the -s option for argument definitions.

       -s       Create an ARP entry for the host called hostname with the MAC address MACaddress.  For example, an Ethernet address  is  given  as
                six  hexadecimal  bytes separated by colons. The entry will be permanent unless the word temp is given in the command. If the word
                pub is given, the entry will be published. For instance, this system will respond to ARP requests for  hostname  even  though  the
                hostname  is  not its own. The word trail indicates that trailer encapsulations may be sent to this host. arp -s can be used for a
                limited form of proxy ARP when a host on one of the directly attached networks is not physically present on  the  subnet.  Another
                machine can then be configured to respond to ARP requests using arp -s. This is useful in certain SLIP configurations.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ifconfig(1M), arp(7P), attributes(5)

SunOS 5.10                                                          7 Mar 2003                                                             arp(1M)