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-
- icmp <subcommands>
-
- These commands are used for the Internet Control Message Protocol
- service.
-
-
-
- icmp echo [ON | off]
-
- (B) Display or set the flag controlling the asynchronous
- display of ICMP Echo Reply packets. This flag must be on for
- pings to work. Default is on.
-
-
- icmp quench [ON | off]
-
- With 'icmp quench off', when a packet is received and memory
- available < threshold, the packet will be dropped (i.e., no
- quench or anything.) The higher protocol layers will keep track
- of re-transmitting the dropped packets.
-
- With 'icmp quench on', when packets are received and the high
- water mark for dynamically allocatable storage has been exceeded,
- JNOS submits an ICMP Source Quench to the originator. Usually,
- before the originator will have reacted to the source quench,
- JNOS's dynamically allocatable storage will have been exhausted.
- What happens after that is uncertain, but it is assumed to be
- unfavorable. Many tcp/ip implementations don't even respond to
- Source Quenches at all. See also 'memory threshold command.'
-
- Default is ON.
-
-
- icmp status
-
- Display statistics about the Internet Control Message
- Protocol (ICMP), including the number of ICMP messages of each
- type sent or received.
-
-
- icmp timeexceed [<ON | off>]
-
- Allows 'time exceeded' message to be sent when the ttl of an ip
- packet to be routed becomes zero. When turned OFF, no message is
- sent which allows the system to become invisible for
- 'traceroutes', etc.
-
-
- icmp trace [0|1|2]
-
- (B) Display or set the flag controlling the display of ICMP
- error messages. These informational messages are generated by
- Internet routers in response to routing, protocol or congestion
- problems. This only functions when in console mode. Default is
- 0 (off). A trace value of 1 traces all icmp packets, while a
- value of 2 traces only icmp types known to Jnos.
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