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3com MSR 20-20 참조 매뉴얼

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ip unreachables enable
Syntax
ip unreachables enable
undo ip unreachables
View
System view
Parameter
None
Description
Use the ip unreachables enable command to enable the sending of ICMP 
destination unreachable packets.
Use the undo ip unreachables command to disable sending ICMP destination 
unreachable packets.
Sending ICMP destination unreachable packets is enabled by default.
If the feature is disabled, the device will not send network unreachable and source 
route failure ICMP packets, but still send other destination unreachable ICMP 
packets.
Example
# Disable sending ICMP destination unreachable packets.
<Sysname> system-view
[Sysname] undo ip unreachables 
reset ip statistics
Syntax
reset ip statistics
View
User view
Parameter
None
Description
Use the reset ip statistics command to clear statistics of IP packets.
Related command:
Example
# Clear statistics of IP packets.
<Sysname> reset ip statistics 
reset tcp statistics
Syntax
reset tcp statistics
View
User view