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arp(8)

System Administration Commands                                          arp(8)



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 | permanent] [pub]
                 [trail]

DESCRIPTION
       The  arp  program  displays  and  modifies  the Internet-to-MAC address
       translation  tables  used  by  the  address  resolution  protocol  (see
       arp(4P)).


       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  that modify the ARP translation tables (-d, -f, and -s) can be
       used only when the invoked command is granted the sys_net_config privi‐
       lege. See privileges(7).

OPTIONS
       -a

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


           d    Unverified; this is a  local  IP  address  that  is  currently
                undergoing  Duplicate  Address Detection. ARP will not respond
                to requests for this address until Duplicate Address Detection
                completes.


           o    Old;  this entry is aging away. If IP requests it again, a new
                ARP query will be generated. This state is used for  detecting
                peer address changes.


           y    Delayed;  periodic  address defense and conflict detection was
                unable to send a packet due to internal network use limits for
                non-traffic-related  messages (100 packets per hour per inter‐
                face). This occurs only on interfaces with very large  numbers
                of aliases.


           A    Authority;  this machine is authoritative for this IP address.
                ARP will not accept  updates  from  other  machines  for  this
                entry.


           L    Local;  this  is  a  local IP address configured on one of the
                machine's logical interfaces. ARP will defend this address  if
                another node attempts to claim it.


           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;  entry  cannot be changed by learned information. This
                indicates that the permanent flag was used when  creating  the
                entry.


           U    Unresolved; waiting for ARP response.

           You  can  use the -n option with the -a option to disable the auto‐
           matic numeric IP address-to-name translation. Use arp  -an  or  arp
           -na  to display numeric IP addresses. The arp  -a option is equiva‐
           lent to:


             # netstat -p -f inet

           ...and -an and -na are equivalent to:

             # netstat -pn -f inet



       -d

           Delete an entry for the host called hostname.

           Note that ARP entries for IPMP (IP Network Multipathing)  data  and
           test  addresses  are  managed  by  the  kernel  and  thus cannot be
           deleted.


       -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] [permanent]

           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 not be
           subject to deletion by aging unless the word temp is  specified  in
           the  command.  If the word pub is specified, the entry will be pub‐
           lished, which means that this system will respond to  ARP  requests
           for hostname even though the hostname is not its own. The word per‐
           manent indicates that  the  system  will  not  accept  MAC  address
           changes for hostname from the network.

           Solaris  does  not  implement  trailer  encapsulation, and the word
           trail is accepted on entries for compatibility only.

           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
           a subnet. Another machine can then be configured to respond to  ARP
           requests  using  arp  -s. This is useful in certain SLIP configura‐
           tions.

           Non-temporary proxy ARP entries for  an  IPMP  (IP  Network  Multi‐
           pathing)  group  are  automatically managed by the kernel. Specifi‐
           cally, if the hardware address in an  entry  matches  the  hardware
           address  of an IP interface in an IPMP group, and the IP address is
           not local to the system, this will be regarded as an IPMP proxy ARP
           entry.  This  entry  will  have  its hardware address automatically
           adjusted in order to keep the IP address reachable so long  as  the
           IPMP group has not entirely failed.

           ARP entries must be consistent across an IPMP group. Therefore, ARP
           entries cannot be associated with individual underlying  IP  inter‐
           faces  in  an  IPMP  group, and must instead be associated with the
           corresponding IPMP IP interface.

           Note that ARP entries for IPMP data and test addresses are  managed
           by the kernel and thus cannot be changed.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/network


SEE ALSO
       arp(4P), attributes(7), privileges(7), ifconfig(8), netstat(8)



Oracle Solaris 11.4               10 Feb 2017                           arp(8)
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