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--icmp-type <type> (ICMP type)
This option specifies which type of ICMP messages should be
generated. <type> can be supplied in
two different ways. You can use the
official type numbers assigned by IANA
(e.g. --icmp-type 8 for ICMP Echo Request), or you
can use any of the mnemonics listed in
the section called “ICMP Types”.
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--icmp-code <code> (ICMP code)
This option specifies which ICMP code should be included in
the generated ICMP messages. <code> can be
supplied in two different ways. You can use the
official code numbers assigned by IANA
(e.g. --icmp-code 1 for Fragment Reassembly Time
Exceeded), or you can use any of the mnemonics listed in
the section called “ICMP Codes”.
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--icmp-id <id> (ICMP identifier)
This option specifies the value of the identifier used in some of
the ICMP messages. In general it is used to match request and
reply messages. <id> must be a number in
the range [0–65535].
-
--icmp-seq <seq> (ICMP sequence)
This option specifies the value of the sequence number field used
in some ICMP messages. In general it is used to match request and
reply messages. <id> must be a number in
the range [0–65535].
-
--icmp-redirect-addr <addr> (ICMP Redirect address)
This option sets the address field in ICMP Redirect messages. In
other words, it sets the IP address of the router that should be
used when sending IP datagrams to the original destination.
<addr> can be either an IPv4 address
or a hostname.
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--icmp-param-pointer <pointer> (ICMP Parameter Problem pointer)
This option specifies the pointer that indicates the location of
the problem in ICMP Parameter Problem messages. <pointer>
should be a number in the range [0–255]. Normally this option is
only used when ICMP code is set to 0 ("Pointer indicates the error").
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--icmp-advert-lifetime <ttl> (ICMP Router Advertisement Lifetime)
This option specifies the router advertisement lifetime, this is,
the number of seconds the information carried in an ICMP Router
Advertisement can be considered valid for. <ttl>
must be a positive integer in the range [0–65535].
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--icmp-advert-entry <addr>,<pref> (ICMP Router Advertisement Entry)
This option adds a Router Advertisement entry to an ICMP Router
Advertisement message. The parameter must be two
values separated by a comma. <addr> is
the router's IP and can be specified either as an IP address in
dot-decimal notation or as a hostname. <pref>
is the preference level for the specified IP. It must be a number
in the range [0–4294967295]. An example is
--icmp-advert-entry 192.168.128.1,3.
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--icmp-orig-time <timestamp> (ICMP Originate Timestamp)
This option sets the Originate Timestamp in ICMP Timestamp messages.
The Originate Timestamp is expressed as the number of milliseconds
since midnight UTC and it corresponds to the time the sender
last touched the Timestamp message before its transmission.
<timestamp> can be specified as a regular
time (e.g. 10s, 3h, 1000ms), or the special string
now. You can add or subtract
values from now, for example
--icmp-orig-time now-2s,
--icmp-orig-time now+1h,
--icmp-orig-time now+200ms.
-
--icmp-recv-time <timestamp> (ICMP Receive Timestamp)
This option sets the Receive Timestamp in ICMP Timestamp messages.
The Receive Timestamp is expressed as the number of milliseconds
since midnight UTC and it corresponds to the time the echoer
first touched the Timestamp message on receipt.
<timestamp> is as with
--icmp-orig-time.
-
--icmp-trans-time <timestamp> (ICMP Transmit Timestamp)
This option sets the Transmit Timestamp in ICMP Timestamp messages.
The Transmit Timestamp is expressed as the number of milliseconds
since midnight UTC and it corresponds to the time the echoer
last touched the Timestamp message before its transmission.
<timestamp> is as with
--icmp-orig-time.
These identifiers may be used as mnemonics for the ICMP type numbers given
to the
--icmp-type
option. In general there are three forms of each identifier: the full name
(e.g. destination-unreachable), the short name (e.g.
dest-unr), or the initials (e.g. du).
In ICMP types that request something, the word "request" is omitted.
echo-reply, echo-rep, er
Echo Reply (type 0). This message is sent in response to an Echo
Request message.
destination-unreachable, dest-unr, du
Destination Unreachable (type 3). This message indicates that
a datagram could not be delivered to its destination.
source-quench, sour-que, sq
Source Quench (type 4). This message is used by a congested
IP device to tell other device that is sending packets too fast
and that it should slow down.
redirect, redi, r
Redirect (type 5). This message is normally used by routers
to inform a host that there is a better route to use for sending
datagrams. See also the --icmp-redirect-addr
option.
echo-request, echo, e
Echo Request (type 8). This message is used to test the
connectivity of another device on a network.
router-advertisement, rout-adv, ra
Router Advertisement (type 9). This message is used by
routers to let hosts know of their existence and capabilities. See
also the --icmp-advert-lifetime option.
router-solicitation, rout-sol, rs
Router Solicitation (type 10). This message is used by hosts
to request Router Advertisement messages from any listening
routers.
time-exceeded, time-exc, te
Time Exceeded (type 11). This message is generated by some
intermediate device (normally a router) to indicate that a datagram
has been discarded before reaching its destination because the
IP TTL expired.
parameter-problem, member-pro, pp
Parameter Problem (type 12). This message is used when a device
finds a problem with a parameter in an IP header and it cannot
continue processing it. See also the
--icmp-param-pointer option.
timestamp, time, tm
Timestamp Request (type 13). This message is used to request
a device to send a timestamp value for propagation time
calculation and clock synchronization. See also the
--icmp-orig-time,
--icmp-recv-time, and
--icmp-trans-time.
timestamp-reply, time-rep, tr
Timestamp Reply (type 14). This message is sent in response
to a Timestamp Request message.
information, info, i
Information Request (type 15). This message is now obsolete
but it was originally used to request configuration information
from another device.
information-reply, info-rep, ir
Information Reply (type 16). This message is now obsolete but
it was originally sent in response to an Information Request
message to provide configuration information.
mask-request, mask, m
Address Mask Request (type 17). This message is used to
ask a device to send its subnet mask.
mask-reply, mask-rep, mr
Address Mask Reply (type 18). This message contains a subnet
mask and is sent in response to a Address Mask Request message.
traceroute, trace, tc
Traceroute (type 30). This message is normally sent
by an intermediate device when it receives an IP datagram
with a traceroute option. ICMP Traceroute messages are still
experimental, see
RFC 1393
for more information.
These identifiers may be used as mnemonics for the ICMP code numbers given
to the
--icmp-code
option. They are listed by the ICMP type they correspond to.
Destination Unreachablenetwork-unreachable, netw-unr, net
Code 0. Datagram could not be delivered to its destination
network (probably due to some routing problem).
host-unreachable, host-unr, host
Code 1. Datagram was delivered to the destination network but it
was impossible to reach the specified host (probably due to some
routing problem).
protocol-unreachable, prot-unr, proto
Code 2. The protocol specified in the Protocol field of the IP
datagram is not supported by the host to which the datagram was
delivered.
port-unreachable, port-unr, port
Code 3. The TCP/UDP destination port was invalid.
needs-fragmentation, need-fra, frag
Code 4. Datagram had the DF bit set but it was too large for the
MTU of the next physical network so it had to be dropped.
source-route-failed, sour-rou, routefail
Code 5. IP datagram had a Source Route option but a router
couldn't pass it to the next hop.
network-unknown, netw-unk, net?
Code 6. Destination network is unknown. This code is never used.
Instead, Network Unreachable is used.
host-unknown, host-unk, host?
Code 7. Specified host is unknown. Usually generated by a router
local to the destination host to inform of a bad address.
host-isolated, host-iso, isolated
Code 8. Source Host Isolated. Not used.
network-prohibited, netw-pro, !net
Code 9. Communication with destination network is
administratively prohibited (source device is not allowed to send
packets to the destination network).
host-prohibited, host-pro, !host
Code 10. Communication with destination host is administratively
prohibited. (The source device is allowed to send packets to the
destination network but not to the destination device.)
network-tos, unreachable-network-tos, netw-tos, tosnet
Code 11. Destination network unreachable because it cannot
provide the type of service specified in the IP TOS field.
host-tos, unreachable-host-tos, toshost
Code 12. Destination host unreachable because it cannot provide
the type of service specified in the IP TOS field.
communication-prohibited, comm-pro, !comm
Code 13. Datagram could not be forwarded due to filtering that
blocks the message based on its contents.
host-precedence-violation, precedence-violation, prec-vio, violation
Code 14. Precedence value in the IP TOS field is not permitted.
precedence-cutoff, prec-cut, cutoff
Code 15. Precedence value in the IP TOS field is lower than the
minimum allowed for the network.
Redirectredirect-network, redi-net, net
Code 0. Redirect all future datagrams with the same destination
network as the original datagram, to the router specified in the
Address field. The use of this code is prohibited by
RFC 1812.
redirect-host, redi-host, host
Code 1. Redirect all future datagrams with the same destination
host as the original datagram, to the router specified in the
Address field.
redirect-network-tos, redi-ntos, redir-ntos
Code 2. Redirect all future datagrams with the same destination
network and IP TOS value as the original datagram, to the router
specified in the Address field. The use of this code is
prohibited by RFC 1812.
redirect-host-tos, redi-htos, redir-htos
Code 3. Redirect all future datagrams with the same destination
host and IP TOS value as the original datagram, to the router
specified in the Address field.
Router Advertisementnormal-advertisement, norm-adv, normal, zero, default, def
Code 0. Normal router advertisement. In Mobile IP: Mobility agent
can act as a router for IP datagrams not related to mobile nodes.
not-route-common-traffic, not-rou, mobile-ip, !route, !commontraffic
Code 16. Used for Mobile IP. The mobility agent does not route
common traffic. All foreign agents must forward to a default
router any datagrams received from a registered mobile node
Time Exceededttl-exceeded-in-transit, ttl-exc, ttl-transit
Code 0. IP Time To Live expired during transit.
fragment-reassembly-time-exceeded, frag-exc, frag-time
Code 1. Fragment reassembly time has been exceeded.
Parameter Problempointer-indicates-error, poin-ind, pointer
Code 0. The pointer field indicates the location of the problem.
See the --icmp-param-pointer option.
missing-required-option, miss-option, option-missing
Code 1. IP datagram was expected to have an option that is not
present.
bad-length, bad-len, badlen
Code 2. The length of the IP datagram is incorrect.
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