H3C S6812 Series Command Reference Manual page 837

ip icmp fragment discarding
Use ip icmp fragment discarding to disable forwarding of ICMP fragments.
Use undo ip icmp fragment discarding to enable forwarding of ICMP fragments.
Syntax
ip icmp fragment discarding
undo ip icmp fragment discarding
Default
Forwarding of ICMP fragments is enabled.
Views
System view
Predefined user roles
network-admin
Usage guidelines
Disabling forwarding of ICMP fragments can prevent ICMP fragment attacks.
Examples
# Disable forwarding of ICMP fragments.
<Sysname> system-view
[Sysname] ip icmp fragment discarding
ip icmp source
Use ip icmp source to specify the source address for outgoing ICMP packets.
Use undo ip icmp source to remove the specified source address for outgoing ICMP packets.
Syntax
ip icmp source ip-address
undo ip icmp source
Default
No source address is specified for outgoing ICMP packets. The device uses the IP address of the
sending interface as the source IP address for outgoing ICMP packets.
Views
System view
Predefined user roles
network-admin
Parameters
ip-address: Specifies an IP address.
Usage guidelines
It is a good practice to specify the IP address of the loopback interface as the source IP address for
outgoing ping echo request and ICMP error messages. This feature helps users to locate the
sending device easily.
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