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Ping Messages Explained


Each exclamation point indicates receipt of a reply. . U A destination unreachable error PDU was received. Now let's enable Routing Information Protocol (RIP) on Router2 and Router3: Router2# router rip network network Router3# router rip network network Now we have: Router1#debug ip packet Back To The Top Tweet Copyright © 2005-2015 Online Computer Tips.com HOME | ALL TIPS | COMPUTER TUTORIALS | TECH NEWS | RESOURCES | ADVERTISING | ABOUT US | PRIVACY POLICY navigate here

Jan 20 17:04:07.167: IP: s= (local), d= (Ethernet0), len 100, sending Jan 20 17:04:07.171: IP: s= (local), d= (Ethernet0), len 100, encapsulation failed. Jan 20 16:42:48.643: IP: s= (local), d= (Serial0), len 28, sending Jan 20 16:42:48.647: UDP src=34237, dst=33435 Jan 20 16:42:48.667: IP: s= (Serial0), d= (Serial0), len 56, rcvd 3 Jan 20 The three most common error messages that you will see are as follows: Destination Host Unreachable Request Timed Out Ping Request Could Not Find Host... Another three UDP messages are now sent, each with the TTL value set to 2, which causes the second router to return ICMP TEMs.

Ping Messages Explained

Router1 is sending packets to Router4, but is not getting any answer from Router4. They can also be useful for troubleshooting. Archived from the original on 8 September 2010. When a ping response is not successful you can get a variety of error replies.

Teaching a blind student MATLAB programming How to improve this plot? ICMP Type Literal 0 echo-reply 3 destination unreachable code 0 = net unreachable 1 = host unreachable 2 = protocol unreachable 3 = port unreachable 4 = fragmentation needed and DF Router4(config)# access-list 100 permit tcp any any eq telnet Router4(config)#interface s0 Router4(config-if)#ip access-group 100 in Router1#configure terminal Enter configuration commands, one per line. Ping Output The host does not need to completely wake up all devices, and may return to low power mode after a short delay.

Router1#debug ip packet detail IP packet debugging is on (detailed) Router1#ping Type escape sequence to abort. It also works with hostnames on the same network so if you have a server called WebServer you can type in ping WebServer to check for connectivity. Sending 5, 100-byte ICMP Echos to, timeout is 30 seconds: !!!!! Here are the main error messages and what they mean.

Jan 20 17:19:47.843: IP ARP: sent req src 0000.0c5d.7a0d, dst 0000.0000.0000 Ethernet0. Unix+ping+command+exit+status+codes All rights reserved. In addition, these messages include the first eight bytes of the original message (in this case header of the ICMP echo request, including the quench value), so the ping utility can That option is restricted to users having administrative privileges, but may be used in denial-of-service attacks to induce a ping flood, in which the attacker attempts to overwhelm the victim with

Ping Error Message General Failure

Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/36 ms There is almost no difference. http://www.nthelp.com/icmp.html https://tools.ietf.org/html/rfc889#page-1. Ping Messages Explained You can change this default using an extended ping: Router1#ping Protocol [ip]: Target IP address: Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: 30 Extended commands [n]: Sweep Ping Failure Reasons Type env -h for help on changing targets.

The Traceroute Command The traceroute command is used to discover the routes that packets actually take when traveling to their destination. check over here Did you find something wrong with the information on this page? One possibility is that the serial interface on Router3 has been shut down: Router3#show ip interface brief Serial0 YES manual up up Serial1 YES manual administratively down down This Why would breathing pure oxygen be a bad idea? Ping Return Codes Windows

IP address ip_address not foundwhere the ip_address identifies the invalid IP address argument. For Windows computers you will need to allow ICMP packets through the firewall in order to be able to ping those computers. End with CNTL/Z. http://newmexicosupercomputer.com/ping-error/ping-error-5.html interface Serial1 ip address ! !

Windows uses a fixed identifier, which varies between Windows versions, and a sequence number that is only reset at boot time. Different Ping Errors We recommend that you carefully read Use the Debug Command before issuing debug commands. Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds: Jan 20 16:16:13.367: IP: s= (local), d= (Serial0), len 100, sending.

Components Used This document is not restricted to specific software and hardware versions.

If your CPU is not powerful, or if you have a lot of process-switched packets, they can easily stall your device. It is the 16-bit one's complement of the one's complement sum of the ICMP message starting with the Type field[8] Header Data (32 bits) field, which in this case (ICMP echo To test this out, try this snippet #!/bin/bash light_red='\e[1;91m%s\e[0m\n' light_green='\e[1;92m%s\e[0m\n' ping -c 4 -q google.comz if [ "$?" -eq 0 ]; then printf "$light_green" "[ CONNECTION AVAILABLE ]" else printf "$light_red" Icmp Error Messages Jan 20 16:00:31.599: IP: s= (local), d=, len 100, unroutable.

Why don't cameras offer more than 3 colour channels? (Or do they?) How to make your world’s revolutions feel realistic? This corresponds to the Time Exceeded Message. ICMP_ECHO_REPLY32 structure The ICMP_ECHO_REPLY32 structure describes the data returned in response to an IPv4 echo request on a 64-bit platform. weblink Click Here SUBSCRIBE TO OUR MAILING LIST Get site updates, latest virus alerts and more.

Router1#ping Type escape sequence to abort. asked 7 years ago viewed 26957 times active 4 months ago Linked 1 Logging ping successes and failures in linux 1 How can I assign a system command to a variable Replies: PING stuart-woodward.local ( 56 data bytes --- stuart-woodward.local ping statistics --- 1 packets transmitted, 0 packets received, 100.0% packet loss Returns: 2 Non Resolvable host ping -c 1 sdhjfjsd ; The Ipexport.h header file should never be used directly.

We get a better idea of the problem using this debug command: Router4#debug arp ARP packet debugging is on Router4#ping Type escape sequence to abort. Unknown packet type. & Packet lifetime exceeded. Please try the request again. The ICMP_ECHO_REPLY32 structure is defined in the Ipexport.h header file which is automatically included in the Iphlpapi.h header file.

Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds: !!!!! Other RFCs referenced in this table can be accessed by visiting the RFC Index. p.42. Router3# ! !

If we do not get an answer, the corresponding address in the show arp output is marked as incomplete: Router4#show arp Protocol Address Age (min) Hardware Addr Type Interface Internet Jan 20 16:42:48.707: IP: s= (local), d= (Serial0), len 28, sending Jan 20 16:42:48.711: UDP src=35734, dst=33437 Jan 20 16:42:48.743: IP: s= (Serial0), d= (Serial0), len 56, rcvd 3 Jan 20 When a packet destination is the router itself, this packet has to be process-switched. When you are unable to “ping” the destination host either by IP Address or by hostname, you should pay close attention to the results provided by ICMP.

Router2 is quite busy, and answering the ping is not its main priority. Retrieved December 4, 2014. ^ "RFC 792 - Internet Control Message Protocol".