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icmp
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1994-08-09
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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 OFF.
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 [on | off]
(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
off.