Dell PowerConnect B-RX Configuration Manual page 234

7
Basic IP parameters and defaults
TABLE 43
IP global parameters (Continued)
Parameter Description
ARP rate limiting Lets you specify a maximum number of ARP packets the device
will accept each second. If the device receives more ARP packets
than you specify, the device drops additional ARP packets for the
remainder of the one-second interval.
ARP age The amount of time the device keeps a MAC address learned
through ARP in the device's ARP cache. The device resets the
timer to zero each time the ARP entry is refreshed and removes
the entry if the timer reaches the ARP age.
NOTE: You also can change the ARP age on an individual
Proxy ARP An IP mechanism a router can use to answer an ARP request on
behalf of a host, by replying with the router's own MAC address
instead of the host's.
Static ARP entries An ARP entry you place in the static ARP table. Static entries do
not age out.
Time to Live (TTL) The maximum number of routers (hops) through which a packet
can pass before being discarded. Each router decreases a
packet's TTL by 1 before forwarding the packet. If decreasing the
TTL causes the TTL to be 0, the router drops the packet instead of
forwarding it.
Directed broadcast A directed broadcast is a packet containing all ones (or in some
forwarding cases, all zeros) in the host portion of the destination IP address.
When a router forwards such a broadcast, it sends a copy of the
packet out each of its enabled IP interfaces.
NOTE: You also can enable or disable this parameter on an
Directed broadcast The packet format the router treats as a directed broadcast. The
mode following formats can be directed broadcast:
•
All ones in the host portion of the packet's destination
address.
•
All zeroes in the host portion of the packet's destination
address.
Source-routed A source-routed packet contains a list of IP addresses through
packet forwarding which the packet must pass to reach its destination.
Internet Control The device can send the following types of ICMP messages:
•
Message Protocol
Echo messages (ping messages)
•
(ICMP) messages
Destination Unreachable messages
•
Redirect messages
NOTE: You also can enable or disable ICMP Redirect messages
158
interface basis. Refer to Table 44
individual interface basis. Refer to
on an individual interface basis. Refer to
page 160.
Default
Disabled
Ten minutes
on page 160.
Disabled
2048
64 hops
Disabled
Table 44 on page 160.
All ones
NOTE: If you enable
Enabled
Enabled
Table 44 on
See page...
page 188
page 190
page 190
page 191
page 194
page 194
page 195
all-zeroes directed
broadcasts, all-ones
directed broadcasts
remain enabled.
page 195
page 196
page 198
BigIron RX Series Configuration Guide
53-1002253-01