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476 | IPv4 Addressing
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Enable ICMP unreachable messages
By default, ICMP unreachable messages are disabled. When enabled ICMP unreachable messages are
created and sent out all interfaces. To disable ICMP unreachable messages, use the
no ip unreachable
command.
To reenable the creation of ICMP unreachable messages on the interface, use the following command in
the INTERFACE mode:
To view if ICMP unreachable messages are sent on the interface, use the
show config command in the
INTERFACE mode. If it is not listed in the
show config command output, it is enabled. Only nondefault
information is displayed in the
show config command output.
Enable ICMP redirects
Enable ICMP redirects is supported on e platform
By default, ICMP redirect messages are disabled. When enabled, ICMP redirect messages are created and
sent out all interfaces. To disable ICMP redirect messages, use the
no ip redirect command.
To reenable the creation of ICMP redirect messages on the interface, use the following command in the
INTERFACE mode:
To view if ICMP redirect messages are sent on the interface, use the
show config command in the
INTERFACE mode. If it is not listed in the
show config command output, it is enabled. Only nondefault
information is displayed in the
show config command output.
UDP Helper
UDP helper allows you to direct the forwarding IP/UDP broadcast traffic by creating special broadcast
addresses and rewriting the destination IP address of packets to match those addresses. Configurations
using this feature are described in the section Configurations Using UDP Helper on page 478.
Command Syntax Command Mode Purpose
ip unreachable
INTERFACE Set FTOS to create and send ICMP unreachable
messages on the interface.
Command Syntax Command Mode Purpose
ip redirect
INTERFACE Set FTOS to create and send ICMP redirect messages on
the interface.