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arp - address resolution display and control
arp hostname
arp -a
arp -d hostname
arp -s hostname ether_address [ temp ] [ pub ]
arp -s hostname pvc iface vpi vci [ aal [ encap [ addr ] ] ]
arp -l pvc iface vpi vci [ aal [ encap ] ]
arp -x iface vpi vci
The arp program displays and modifies the Internet-toEthernet
address translation tables used by the address
resolution protocol.
When an ATM interface is present, arp also displays and
modifies the Internet address to ATM virtual circuit translation
tables used by the ATM address resolution protocol.
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.
- -a
- The program displays all of the current ARP entries.
- -d
- Delete an entry for the host called hostname.
If the ARP entry for this destination host corresponds
to an entry in the ATM arp table, the outgoing virtual
circuit to this destination host called hostname is
terminated, and the entry deleted.
- -s
- Create an ARP entry for the host called hostname with
the Ethernet address ether_address. The Ethernet
address is given as six hex bytes separated by colons.
The entry will be permanent unless the word temp is
given in the command. Temporary entries that consist of
a complete Internet address and a matching Ethernet
address are flushed from the arp table if they haven't
been referenced in the past 20 minutes. A permanent
entry is not flushed. If the word pub is given, the
entry will be "published"; i.e., this system will act
as an ARP server, responding to requests for hostname
even though the host address is not its own.
An alternate format of the arp command with the -s
option can be used to set an ATM arp entry for an outgoing
permanent virtual circuit (PVC), using the pvc
keyword in the command. All traffic for the host
called hostname will be sent via the ATM interface
iface using VPI vpi, VCI vci, AAL type aal and encapsulated
based on encapsulation type encap. If encapsulation
is specified as llc_bridged_8023 the following
argument must be the 6-byte colon separated destination
MAC address.
- -l
- Attach the IP layer to an incoming PVC. The keyword
pvc needs to be specified in this command. All traffic
received on the ATM interface iface using VPI vpi, VCI
vci, AAL type aal and decapsulated based on encapsulation
type encap, will be handed over to IP.
- -x
- Detach the IP layer from an incoming ATM virtual circuit.
IP traffic will no longer be accepted on the
specified VPI vpi and VCI vci for the specified interface
iface.
Data ONTAP does not support trailer encapsulations.
The following restrictions apply when using the arp command
to set ATM arp entries for PVCs:
Currently the value of vpi specified must be zero (0)
and the value of vci specified must be less than 1024.
The value of aal specified must be one of 4 or 5. If
no value is specified the default value of 5 is
selected.
If no encapsulation is specified, the value of null is
selected. Encapsulation must be one of:
null (no encapsulation)
llc_routed (IEEE LLC encapsulation for routed
PDUs)
llc_bridged_8023 (IEEE LLC encapsulation for Ethernet/802.3
bridged PDUs)
In conjunction with using the arp -s and -l options to set
ATM arp entries for PVCs on the NetApp filer, the following
additional procedures need to be carried out:
A complementary arp setup needs to be carried out at
the remote ATM host based on the syntax specified for
the software running on that host, to set an outgoing
and an incoming PVC to and from the filer.
On the interconnecting ATM switch(es), virtual channels
need to be assigned corresponding to the VPI/VCI
entries made for the arp -s and arp -l commands on the
filer and the equivalent commands on the remote host.
na_ifconfig(1), RFC1483.
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