Flushing The Atm Arp Cache; Administering Udp Helper - 3Com LANPLEX 2500 EXTENDEDPLEX®2500 EXTENDED User Manual

9-18 C 9: A
HAPTER DMINISTERING
Flushing the ATM
ARP Cache
Top-Level Menu
system
ethernet
interface
fddi
route
display
atm
arp define
bridge
display
remove
atmArpServer
ip
remove
multicast arp
ipx
flush
udpHelper
appletalk
routing
snmp
icmpRouterDiscovery
analyzer
rip
script
ping
logout
statistics
Administering
UDP Helper
IP R
OUTING
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.
UDP Helper allows you to send User Datagram Protocol (UDP) packets
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.