9-18 CHAPTER 9: ADMINISTERING IP ROUTING

Flushing the ATM

 

 

 

 

ARP Cache

Top-Level Menu

 

 

 

system

 

 

 

 

 

ethernet

 

 

 

 

 

 

interface

 

 

 

fddi

 

route

display

atm

 

 

arp

define

 

 

bridge

 

display

atmArpServerremove

ip

 

multicast arp

remove

ipx

 

flush

 

udpHelper

appletalk

routing

 

 

 

snmp

 

icmpRouterDiscovery

analyzer

 

 

rip

 

 

 

script

 

ping

 

 

 

logout

 

 

 

 

 

statistics

 

 

 

 

 

 

 

 

To remove all entries from the ATM ARP cache, from the top level of the Administration Console, enter:

ip atmarpserver arp flush

The ATM ARP cache entries are immediately removed from the table.

Administering

UDP Helper allows you to send User Datagram Protocol (UDP) packets

UDP Helper

between routed networks. This protocol provides support for UDP services

 

such as BOOTP or DHCP (Dynamic Host Configuration Protocol), that rely on

 

the BOOTP relay agent. For example, by configuring the logical BOOTP port,

 

you can boot hosts through the router. UDP Helper also provides a relay

 

agent for DHCP broadcasts. UDP packets that rely on the BOOTP relay agent

 

are modified and then forwarded through the router.

 

The following ports for the UDP services are mentioned in this section on

 

UDP Helper:

BOOTP (including DHCP) = 67

TIME = 37

DNS = 53

UDP Helper allows you to configure the amount of time a UDP packet is forwarded between subnetworks. UDP packets are discarded based on the hop count and the seconds value only for BOOTP and DHCP.

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3Com 2500 manual UDP Helper, Flushing the ATM, Are modified and then forwarded through the router