If it doesn't work: Test the routing table and/or other status of all the hops between it and your intended target. A more convenient way of doing this is to use a site like traceroute.org which provides a list of looking glasses sorted by country. Testing Link Status from the Command Line Both the mii-tool and ethtool commands command will provide reports on the link status and duplex settings for supported NICs. up vote 7 down vote favorite 1 Munin is showing me a graph like this: During that spike, I was unable to access my server through the eth0 port (I could http://antonydupont.com/how-to/ethernet-notebook.html
wlan0 Link encap:Ethernet HWaddr 00:06:25:09:6A:D7 BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:2924 errors:0 dropped:0 overruns:0 frame:0 TX packets:2287 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:180948 (176.7 Kb) TX bytes:166377 (162.4 Kb) Here is an example for the yahoo.com domain: [root@bigboy tmp]# whois yahoo.com ... ... And I don't see a log file specifically for eth0. What now? http://www.cyberciti.biz/faq/linux-ethernet-statistics/
You can set hostname permanently in /etc/sysconfig/network. Not the answer you're looking for? Trace route to 184.108.40.206 from 220.127.116.11 1 0 ms 0 ms 0 [18.104.22.168] 2 0 ms 0 ms 0 [22.214.171.124] 3 0 ms 0 ms 0 border-from-40-tesser.boulder.co.coop.net [126.96.36.199] 4 0 ms
Site was hacked, need to remove all URLs starting with + from Google, use robots.txt? Linux Dropped Rx Packets This would have been the most logical choice, but how can we do this without rebooting the system? If you are trying to ping a host on remote network: The network device doesn't have a route in its routing table to the destination network and sends an ICMP reply http://serverfault.com/questions/397033/where-are-ethernet-errors-logged The idea is that those counters are kept by the kernel (more exactly by the network card driver).
Do a traceroute from this router to your intended target server. How To Check Packet Loss In Linux As described in Chapter 2, "Introduction to Networking", there are two types of Ethernet cables crossover and straight-through. wireshark - the powerful tool for capturing and analyzing network traffic, which allows to analyze and catch many network bugs. Don't forget to check existence and contents of /etc/resolv.conf.
Privacy - Terms of Service - Questions or Comments Home Purchase PDFs FAQ About Contact Quick HOWTO : Ch04 : Simple Network Troubleshooting From Linux Home Networking Jump to: navigation, search https://lists.debian.org/debian-user/2009/10/msg01174.html The traceroute program records the IP address of the router that sent the message and knows that that is the first hop on the path to the final destination. Linux Interface Statistics And in general, I don't know how I solve network problems. How To Check Network Logs In Linux A temporary duplex mismatch can cause high error rates. –BillThor Jun 14 '12 at 2:45 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign
This indicates that the connection between your server and the switch/router is functioning correctly. Reply Mary Nicole Ganibo says: July 12, 2015 at 10:00 am Are those tools used for system configuration? By not using recursion, and activating the timestamping feature (the -N switch), you view not only the HTML content of the Web site's index page in your local directory, but also this contact form Another computer plugged into the same router says 100Mb/s, Full duplex.
Remotely, you have to depend on ethtool and mii-tool. [root@flask ~]# ethtool eth0 Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Supported pause Linux Network Connection Logs Carrier may be higher in Linux boxes with long uptimes, it is important to acknowledge the rate at which the errors are incrementing. A good start is to use the curl command with the -I flag to view just the Web page's header and HTTP status code.
Linux CLI Ifconfig – List interfaces, link status and basic error/collision/overrun counters. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the route or the newer (on Linux) ip route - show the routing table status. Rx_crc_errors iperf - to test bandwidth availability openssl (s_client, ocsp, x509...) to debug all SSL/TLS/PKI issues.
This information often says enough for understanding the system behavior and solving a problem. Site was hacked, need to remove all URLs starting with + from Google, use robots.txt? In cut-through mode, the frame with the FCS error may be propagated to the next switch. navigate here Do a traceroute back to your source server.
Length Errors: The received frame length was less than or exceeded the Ethernet standard. iftop - show big users on the network/router. It is a favorite tool of malicious surfers and therefore should be used to test external as well as internal servers under your control. rex says: please how do you do that...
Minha contaPesquisaMapsYouTubePlayNotíciasGmailDriveAgendaGoogle+TradutorFotosMaisShoppingDocumentosLivrosBloggerContatosHangoutsOutros produtos do GoogleFazer loginCampos ocultosPesquise grupos ou mensagens If you want to test file transfers without filling your disk storage, or having the server's disk I/O be a bottleneck, then use this as your output file instead. [root@smallfry tmp]# There are a variety of ICMP response codes which can help in further troubleshooting.