Routing
RM Web L3P
Release
4.1
03/08
7.3
ARP
111
7.3.1 Setting ARP parameters
Parameter Meaning Value range Default setting
Aging Time With “Aging Time” you specify the time for
which an entry remains before being delet-
ed from the table. If there is a data transfer
with the device within this time period, then
the time measuring begins from the start
again.
15-21600 s 1200
Response Time With “Response Time” you specify how
long ARP waits for a response before the
query is seen to have failed.
1-10 1
Retries With “Retries” you specify how often ARP
repeats a failed query before stopping the
query to this address.
0-10 4
Cache Size “Cache Size” enables you to limit the maxi-
mum number of entries in the table. When
the maximum number is reached, ARP de-
letes the oldest entry.
192-2048 2048
Dynamic Renew When the “Dynamic Renew” is switched
on, ARP starts a new query to a device for
which the entry has exceeded the aging
time. If this query is not answered, the
Switch removes the entry from the table.
on/off on
Selective
Learning
In the default setting, the router learns ARP
entries passively. This means that the
router receives all ARP requests and auto-
matically learns the IP/MAC address
assignment of the sending device. The
automatic learning of all connected devices
means that time-consuming ARP queries
are excluded if the router has to send a
data packet to an unknown device. In this
case, the ARP tables may also be filled with
unnecessary ARP entries (e.g. from
devices that only wish to communicate
locally). If “Selective Learning” is activated,
then the router only learns the source
IP/MAC address assignment if the ARP
request was directed to the router itself
(i.e. the router address would explicitly
queried).
on/off off
Table 12: ARP parameters
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