Icmp Message Processing; Icmp Redirect Messages - Patton electronics SmartNode Series Software Configuration Manual

11 • IP interface configuration
• Set the network mask to netmask
• Enable IP processing for the IP interface name without assigning an explicit IP address
The ipaddress command offers the following options:
unnumbered Enables IP processing on an interface without assigning an explicit IP address to the inter-
face.
ip-address Specifies the IP address of the subscriber in the form A.B.C.D.
netmask Specifies the network mask in the form A.B.C.D. A network mask of at least 24 bits must be
entered; i.e. a mask in the range 255.255.255.0 through 255.255.255.255.
dhcp Enables the DHCP client on this interface. For more information on DHCP-client configura-
tion refer to chapter 21,
Mode: Context IP. This command also places you in interface configuration mode.
Step
1 node (ctx-ip)[router]#interface name
2 node (if-ip)[ name ]# ipaddress {unnum-
bered | ( ip-address netmask ) | dhcp}
Example: Configure IP interface address and netmask
To set the IP address to 192.168.1.3 and net mask to 255.255.255.0 for the IP interface lan, use the following
commands in IP context configuration mode.
SN(ctx-ip)[router]#interface lan
SN(if-ip)[lan]#ipaddress 192.168.1.3 255.255.255.0

ICMP message processing

The IP suite offers a number of services that control and manage IP connections. The Internet Control Mes-
sage Protocol (ICMP) provides many of these services. Routers send ICMP messages to hosts or other routers
when a problem is discovered with the Internet header. For detailed information on ICMP, see RFC 792.
SmartWare supports the following ICMP message processing features:
•

ICMP redirect messages

• Router advertisement broadcast message

ICMP redirect messages

Routes are sometimes less than optimal. For example, the router may be forced to resend a packet through the
same interface on which it was received. In this case, the SmartWare application software sends an ICMP redi-
rect message to the originator of the packet telling the originator that the router is on a subnet directly con-
nected to the receiving device, and that it must forward the packet to another system on the same subnet. The
software sends an ICMP redirect message to the originator of the packet because the originating host presum-
ably could have sent that packet to the next hop without involving this device at all. The redirect message
instructs the sender to remove the receiving device from the route and substitute a specified device representing
a more direct path. This feature is enabled by default.
128
"DHCP configuration"
Command
SmartWare Software Configuration Guide
on page 245.
Purpose
Selects the existing interface name , which shall be
configured
Sets the IP address ip-address and netmask net-
mask for interface name
Software IP interface configuration task list