Linux Server errors and meanings

Source: Internet
Author: User
Tags ftp connection
Article Title: Common Errors and meanings on Linux servers. Linux is a technology channel of the IT lab in China. Includes desktop applications, Linux system management, kernel research, embedded systems, open source, and other basic classification tips
Eth1: Too much work at interrupt, IntrStatus = 0x0001
The meaning of this prompt is. A network card has too many interrupted requests. If it appears only once, it can be ignored. However, if this prompt appears frequently or appears in a centralized manner, there are many possibilities involved that need to be processed .. There are many possibilities, such as NIC performance, server performance, and network attacks ...... And so on.
General class prompts
IPVS: incoming ICMP: failed checksum from 61.172.0.X!
The server receives an ICMP packet with a checksum and an error. This type of data packet may be generated illegally. However, the server receives a large amount of data. Generally, this parameter is ignored.
Generally, the proxy server forwards thousands of packets per second during work. Receiving several error packets does not affect normal operation. This is the most frequently asked type of prompt.
General class prompts
NET: N messages suppressed.
The server ignores N Packets. Similar to the previous prompt. Packets received by the server are considered useless junk data. This type of data is mostly produced by attack programs.
This prompt can be ignored if N is small. However, if there are more than three data records frequently or for a long time. It is very likely that the server is vulnerable to bandwidth attacks such as junk data.
General class prompts
UDP: bad checksum. From 221.200.X.X: 50279 to 218.62.X.X: 1155 ulen 24
UDP: short packet: 218.2.X.X: 3072 3640/217 to 222.16x.x: 57596
218.26.131.X sent an invalid ICMP type 3, code 13 error to a broadcast: on eth0
The server receives an error packet. They are UDP checksum and error, too short UDP packets, and an invalid ICMP data. This type of information is generally generated illegally. However, if the problem is not serious, you can ignore it directly.
General class prompts
Kernel: conntrack_ftp: partial 227 2205426703 + 13
FTP_NAT: partial packet 2635716056/20 in 2635716048/2635716075
An error occurs when the server maintains an FTP connection. Such prompts can generally be ignored directly. Serious network communication problems!
Netdev watchdog: eth1: transmit timed out
Eth1: link down
Eth1: link up, 10 Mbps, half-duplex, lpa 0x0000
Eth2: link up, 100 Mbps, full-duplex, lpa 0x41E1
Setting full-duplex based on MII #24 link partner capability of 45e1
These prompts appear only when serious problems occur in network communication. Faults are basically related to network disconnection. These prompts indicate that data transmission times out for a certain network adapter, the network adapter is down, the network adapter is up, and the connection rate is 10/100 Mbps. The prompts for the last three lines written here are similar. When this type of prompt appears, you must pay attention to the network connection status for handling !!!
Serious network communication problems!
NIC Link is Up 100 Mbps Full Duplex
Situation and kernel: eth1: link up ,...... Same. The connection rate that a network card can adapt. It is generally considered that the network adapter is down, but the adaptive speed of the network adapter is also a communication problem. This type of information can be ignored if the network cable is disconnected normally.
Serious network communication problems!
Eth0: Transmit timed out, status 0000, PHY status 786d, resetting ...... Eth0: Reset not complete yet. Trying harder.
The first error indicates that the NIC fails to send data. Reset the NIC. The second message indicates that the NIC is not successfully reset ...... These prompts are all serious communication problems.
Alarm program prompt
0001 ## WMPCheckV001 ## 2005-04-13_10: 10: 01 Found. (ARP Spoofing sniffer )! IP: 183 MAC: 5 0002 # WMPCheckV001 #2005-04-07_01: 53: 32 Found. (MAC_incomplete )! IP: 173 mac_incomplete: 186 0003 # WMPCheckV001 #: 25: 11 Found. (HIGH_synsent )! Totl: 4271 SynSent: 3490 0004 # WMPCheckV001 #20 ......
This is a prompt caused by the alarm program. Detailed information needs to be received in real time using the client of the alarm program. For details, see "alarm module and log ".
General class prompts
These rows indicate. A network card enters (left) hybrid mode. Generally, the hybrid mode is used only when packet capture is required for communication. When maintenance or fault analysis is used (such as the countflow command in consoletools ). This type of prompts can be ignored. This prompt should be noted if no maintenance is performed on both the frontend and the remote end, but this is unlikely.
Basic irrelevant
Keyboard: unknown scancode e0 5e
The keyboard receives undefined key values. If it appears frequently. The keyboard may be faulty. This is sometimes prompted for special keys or key combinations in linux. Check whether the server's keyboard is pressed. Generally, this parameter is ignored in other cases.
Basic irrelevant
Uses obsolete (PF_INET, SOCK_PACKET)
The system kernel calls some functional modules, which will appear during the first call. Generally, it is related to the use of debugging tools. Can be ignored directly.
Network Communication fault
Neighbour table overflow.
This prompt is displayed. It is generally because some computers in the LAN are infected with viruses. In severe cases, communication is affected. Computers with abnormal Intranet Communication must be processed.
Network Communication fault
Eth1: Transmit error, Tx status register 82. probably a duplex mismatch. see Documentation/networking/vortex.txt Flags; bus-master 1, dirty 9994190 (14) current 9994190 (14) Transmit list 00000000. f7171580. 0: @ f7171200 length 800001e6 status 000101e6 1: @ f7171240 length 8000008c status 0001008c ......
This prompt is available at 3com. I feel that it will not be very serious if it appears. At present, the solution of Dimension 1 is to replace the NIC on the server. I feel that 3com Nic has some problems ......
Serious server system faults
CPU0: Temperature above threshold CPU0: Running in modulated clock mode
The operating temperature of the server CPU is too high. Hardware faults must be ruled out.
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