Specifications

Management Guide CLI
TigerAccess™ EE
SMC7824M/VSW 223
To enable or disable Proxy-ARP on Interface configuration mode, use the following com-
mand.
Command Mode Description
ip proxy-arp Enables proxy-ARP at specified interface
no ip proxy-arp
Interface
Disables the configured proxy-ARP from the interface.
7.13 ICMP 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.
Type Value Type Value
ICMP_ECHOREPLY 0 ICMP_DEST_UNREACH 3
ICMP_SOURCE_QUENCH 4 ICMP_REDIRECT 5
ICMP_ECHO 8 ICMP_TIME_EXCEEDED 11
ICMP_PARAMETERPROB 12 ICMP_TIMESTAMP 13
ICMP_TIMESTAMPREPLY 14 ICMP_INFO_REQUEST 15
ICMP_INFO_REPLY 16 ICMP_ADDRESS 17
ICMP_ADDRESSREPLY 18
Tab. 7.1 ICMP Message Type
The following figure shows simple ICMP message structure.
0 7 15 16 31
8-bit Type 8-bit Code 16-bit Checksum
(Contents Depend on Type and Code)
Fig. 7.16 ICMP Message Structure
It is possible to control ICMP message through user’s configuration. You can configure to
block the echo reply message to the partner who is doing ping test to device and interval
to transmit ICMP message.