158 BigIron RX Series Configuration Guide
53-1002253-01
Basic IP parameters and defaults
7
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.
Disabled page 188
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
interface basis. Refer to Table 44 on page 160.
Ten minutes page 190
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.
Disabled page 190
Static ARP entries An ARP entry you place in the static ARP table. Static entries do
not age out.
2048 page 191
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.
64 hops page 194
Directed broadcast
forwarding
A directed broadcast is a packet containing all ones (or in some
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
individual interface basis. Refer to Table 44 on page 160.
Disabled page 194
Directed broadcast
mode
The packet format the router treats as a directed broadcast. The
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.
All ones
NOTE: If you enable
all-zeroes directed
broadcasts, all-ones
directed broadcasts
remain enabled.
page 195
Source-routed
packet forwarding
A source-routed packet contains a list of IP addresses through
which the packet must pass to reach its destination.
Enabled page 195
Internet Control
Message Protocol
(ICMP) messages
The device can send the following types of ICMP messages:
• Echo messages (ping messages)
• Destination Unreachable messages
• Redirect messages
NOTE: You also can enable or disable ICMP Redirect messages
on an individual interface basis. Refer to Table 44 on
page 160.
Enabled page 196
page 198
TABLE 43 IP global parameters (Continued)
Parameter Description Default See page...
To Next Page
Loading...
