ELS Messages for Address Resolution Protocol (ARP)
- Level:
- U-INFO
- Short Syntax:
- ARP.001 Q ovf nt network
- Long Syntax:
- ARP.001 Queue overflow net network
- Description:
- An ARP packet was discarded, rather than being queued, because the
queue of unprocessed ARP packets was too long. This means that ARP
packets are arriving faster than they can be processed.
Note that this event does
not get counted in ELS, it is instead counted in the ARP console.
The counters (kept per input network) can be read using the
ARP>STATISTICS command, in the ``input packet overflows'' section.
- Cause:
- This is often a symptom of a so-called ``ARP storm''. Some packets
(usually an IP broadcast) arrive at hosts (usually a popular
workstation) which do not recognize the
destination address; they then attempt (in contravention of the
Host specification) to forward the packet, but to do so they need
the ARP mapping. Since they all receive the broadcast at the same
time, they all attempt to forward the packet at the same time, and
all do an ARP request at the same time.
- Action:
- Prevail on the appropriate host manufacturer to bring their software
into compliance with the specification. In the short term, it may
be possible to disable the source of the packets, or cause it to
use an address that the misbehaving hosts do recognize as a broadcast.
- Level:
- P-TRACE
- Short Syntax:
- ARP.002 Pkt in operation_type
hardware_address_space
protocol_type
nt network ID
- Long Syntax:
- ARP.002 Packet received operation_type
hardware_address_space
protocol_type
net network ID
- Description:
- An ARP packet of the type indicated has just arrived for processing.
- Level:
- U-INFO
- Short Syntax:
- ARP.003 Unkwn hdw hardware_address_space
nt network ID
- Long Syntax:
- ARP.003 Unknown hardware space hardware_address_space
net network ID
- Description:
- An incoming ARP packet was received on a network which is not using
ARP for address translation in any protocol.
- Cause:
- The gateway is misconfigured.
- Action:
- Correct the configuration.
- Cause:
- A protocol is in use on that network which requires the use of ARP,
but the router does not support that protocol.
- Action:
- None.
- Level:
- UE-ERROR
- Short Syntax:
- ARP.004 Bd hdw hardware_address_space
hardware_address_length
nt network ID
- Long Syntax:
- ARP.004 Bad hardware address space hardware_address_space
hardware_address_length
nt network ID
- Description:
- An incoming ARP packet was received with a hardware address space code
or hardware address length which does not match the one which
should be used on that network.
- Cause:
- This is probably caused by an error (possible a byte swap problem)
in some other equipment on the network.
- Action:
- Use a network management tool to detect the source host and
contact the manufacturer of the equipment and report the problem.
- Level:
- P-TRACE
- Short Syntax:
- ARP.005 Unkwn prt protocol_type
nt network ID
- Long Syntax:
- ARP.005 Unknown protocol type protocol_type
net network ID
- Description:
- An incoming ARP packet was received for a protocol for which the
router is not using ARP for address translation.
- Cause:
- The gateway is misconfigured.
- Action:
- Correct the configuration.
- Cause:
- A protocol is in use on that network which requires the use of ARP,
but the router does not support that protocol.
- Action:
- None.
- Level:
- UE-ERROR
- Short Syntax:
- ARP.006 Bd prt protocol_type
protocol_address_length
nt network ID
- Long Syntax:
- ARP.006 Bad protocol address length protocol_type
protocol_address_length
net network ID
- Description:
- An incoming ARP packet was received with a protocol address length
which does not match the one which should be used on that network.
- Cause:
- This is probably caused by an error (possible a byte swap problem)
in some other equipment on the network.
- Action:
- Use a network management tool to detect the source host and
contact the manufacturer of the equipment and report the problem.
- Level:
- U-TRACE
- Short Syntax:
- ARP.007 Mk ent hardware_address_space
protocol_type
nt network ID
- Long Syntax:
- ARP.007 Make translation entry hardware_address_space
protocol_type
net network ID
- Description:
- An incoming ARP packet addressed to this host contained a mapping
which was not in the translation cache. A new cache entry was
filled in with the information in the packet.
- Level:
- UE-ERROR
- Short Syntax:
- ARP.008 Bd opc operation_type
hardware_address_space
protocol_type
nt network ID
- Long Syntax:
- ARP.008 Bad operation code operation_type
hardware_address_space
protocol_type
net network ID
- Description:
- An incoming ARP packet was received with an illegal operation code.
- Cause:
- This is probably caused by an error (possibly a byte swap problem)
in some other equipment on the network.
- Action:
- Use a network management tool to detect the source host and
contact the manufacturer of the equipment and report the problem.
- Level:
- U-TRACE
- Short Syntax:
- ARP.009 Rply hardware_address_space
protocol_type
nt network ID
- Long Syntax:
- ARP.009 Reply sent hardware_address_space
protocol_type
net network ID
- Description:
- An ARP reply is being sent as the result of a request for a
translation from another host.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.010 Err on rply nt network ID
- Long Syntax:
- ARP.010 Transmission error on sending reply net network ID
- Description:
- An outgoing ARP or inverse ARP reply packet was dropped
as the result of some problem in the router.
- Cause:
- There are many potential causes of this problem; an overloaded
output queue, a down network, etc.
- Action:
- Consult logging output from the relevant network subsystem
for more information.
- Level:
- U-TRACE
- Short Syntax:
- ARP.011 Del ent hardware_address_space
protocol_type
nt network ID
- Long Syntax:
- ARP.011 Deleting translation entry hardware_address_space
protocol_type
net network ID
- Description:
- A translation cache entry timed out (which was not used or refreshed
recently) has been deleted. Consult the ARP manual for more
details on controlling this process.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.012 No iorb fr rqst nt network ID
- Long Syntax:
- ARP.012 No buffer for outgoing request packet net network ID
- Description:
- An outgoing reply packet was dropped as the result of a lack of
buffers in the router.
- Cause:
- There are many potential causes of this problem; temporary overloads,
etc.
- Action:
- Consult logging output from the rest of the router for more
information. If the problem persists, contact Customer Service.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.013 No mem fr addr nt network ID
- Long Syntax:
- ARP.013 No memory for address net network ID
- Description:
- An outgoing reply packet was dropped as the result of a lack of
memory in the router.
- Cause:
- There are many potential causes of this problem.
- Action:
- Consult logging output from the rest of the router for more
information. If the problem persists, contact Customer Service.
- Level:
- U-TRACE
- Short Syntax:
- ARP.014 Rqst hardware_address_space
protocol_type
nt network ID
- Long Syntax:
- ARP.014 Translation request sent hardware_address_space
protocol_type
net network ID
- Description:
- An ARP translation request is being sent as the result of the
transmission of a packet from the router for which the translation
of another host's address is needed.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.015 Err in rqst nt network ID
- Long Syntax:
- ARP.015 Transmission error in request net network ID
- Description:
- An outgoing request packet was dropped as the result of some
problem in the router.
- Cause:
- There are many potential causes of this problem; an overloaded
output queue, a down network, etc.
- Action:
- Consult logging output from the relevant network subsystem
for more information.
- Level:
- P-TRACE
- Short Syntax:
- ARP.016 unkn dst prot ad nt network ID
- Long Syntax:
- ARP.016 Unknown destination protocol address net network ID
- Description:
- This message is generated when an ARP request specifies an
unknown protocol address (i.e. request not for this router).
- Cause:
- ARP request for a host on this network that is not this router.
- Action:
- None needed. This is normal for the ARP protocol, all requests
are sent as broadcasts.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.017 Rqst send failed rsn reason_code
nt network ID
- Long Syntax:
- ARP.017 Transmission of request failed for reason reason_code
net network ID
- Description:
- An outgoing ARP request packet was dropped as the result of some
problem in the router. The reason_code gives the cause.
- Cause:
- Miscellaneous handler error. (Reason code 1.)
- Action:
- Check for error messages from handler for network_name.
- Cause:
- Output queue overflow, or other flow control. (Reason code
2.)
- Action:
- Alleviate congestion.
- Cause:
- Network down. (Reason code 3.)
- Action:
- See why handler thinks network is down.
- Cause:
- Dropped by handler to avoid looping, or bad broadcast.
(Reason code 4.)
- Action:
- Check configuration.
- Cause:
- Host down. (Reason code 5.)
- Action:
- See why handler thinks host is down.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.018 rcv: No mem for cache ent, prot protocol_type
nt network ID
- Long Syntax:
- ARP.018 receive: No memory for cache entry, protocol protocol_type
net network ID
- Description:
- During the input processing of an ARP packet,
the router did not have memory available to make an ARP
cache entry for the given protocol.
- Cause:
- The router is extremely low on heap memory.
- Action:
- Find some way to reduce memory usage.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.019 xmt: No mem for cache ent, prot protocol_type
nt network ID
- Long Syntax:
- ARP.019 transmit: No memory for cache entry, protocol protocol_type
net network ID
- Description:
- During the output processing of an ARP packet,
the router did not have memory available to make an ARP
cache entry for the given protocol.
- Cause:
- The router is extremely low on heap memory.
- Action:
- Find someway to reduce memory usage.
- Level:
- U-TRACE
- Short Syntax:
- ARP.020 Inverse Rply sent hardware_address_space
protocol_type
nt network ID
- Long Syntax:
- ARP.020 Inverse Reply sent hardware_address_space
protocol_type
net network ID
- Description:
- An inverse ARP reply is being sent as the result of a request for a
translation from another host.
- Level:
- P-TRACE
- Short Syntax:
- ARP.021 inv arp req drp, no prot addr for prot protocol_type
nt network ID
- Long Syntax:
- ARP.021 inverse ARP request dropped, no protocol address protocol_type
nt network ID
- Description:
- This message is generated when an inverse ARP request arrives
but cannot be answered and is discarded because the router
does not have a protocol address for the requested protocol
on the interface.
- Cause:
- The router either does not have the protocol configured
on the interface, or protocol initialization on the interface
is not complete, or inverse ARP is not configured for this protocol.
Inverse ARP is not supported for this protocol.
- Action:
- None needed. This is normal.
- Cause:
- If the protocol requested is AppleTalk, The router may still
be in the process of going through its probe logic before
the AppleTalk protocol address is valid.
- Action:
- None needed. This is normal.
- Level:
- U-TRACE
- Short Syntax:
- ARP.022 Inv Rqst sent hardware_address_space
protocol_type
to hardware_address
nt network ID
- Long Syntax:
- ARP.022 Inverse Request sent hardware_address_space
protocol_type
to hardware_address
net network ID
- Description:
- An inverse ARP request is being sent in an attempt to inform
the other side of our protocol address.
- Level:
- UI-ERROR
- Short Syntax:
- ARP.023 dup proto addr on net: proto = protocol_type
addr = addr_string
- Long Syntax:
- ARP.023 Duplicate protocol address on network: protocol = protocol_type
address = addr_string
- Description:
- An ARP request was received with a source address that matches one of
routers addresses