Siemens S223, S323 user manual Icmp Message Control, Gratuitous ARP, Proxy-ARP

User Manual	UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

7.13.4Gratuitous ARP

Gratuitous ARP is a broadcast packet like an ARP request. It containing IP address and MAC address of gateway, and the network is accessible even though IP addresses of specific host’s gateway are repeatedly assigned to the other.

Configure Gratuitous ARP interval and transmission count using following commands. And configure transmission delivery-start in order to transmit Gratuitous ARP after ARP reply.

Gratuitous ARP is transmitted after some time from transmitting ARP reply.

Command	Mode	Description
		Configures a gratuitous ARP.
arp-patrolTIME COUNT [TIME]	Global	TIME: transmit interval
		COUNT: transmit count
no arp-patrol		Disables a gratuitous ARP.

The following is an example of configuring the transmission interval as 10 sec and trans- mission times as 4 and showing it.

SWITCH(config)# arp-patrol10 4 SWITCH(config)# show running-configBuilding configuration...

Current configuration: hostname SWITCH (Omitted) arp-patrol 10 4

!

no snmp

!

SWITCH(config)#

7.13.5Proxy-ARP

To configure Proxy-ARP, you need to enter Interface configuration mode and use the fol- lowing command.

Command	Mode	Description
ip proxy-arp	Interface	Sets proxy-ARP at specified Interface
no ip proxy-arp		Removes the configured proxy-ARP from the interface.

7.14ICMP Message Control

ICMP stands for Internet Control Message Protocol. When it is impossible to transmit data or configure route for data, ICMP sends error message about it to host. The first 4 bytes of all ICMP messages are same, but the other parts are different ac-cording to type field value and code field value. There are fifteen values of field to distinguish each different ICMP message, and code field value helps to distinguish each type in detail.

The following table shows explanation for fifteen values of ICMP message type.

A50010-Y3-C150-2-7619 169