Download traceroute

- unknown return code, 'x' - return code 0 Type escape sequence to abort. 0 10.131.191.252 MRU 1492 [Labels: 16/18/explicit-null Exp: 0/0/0] L 1 10.131.191.229 MRU 1508 [Labels: 18/explicit-null Exp: 0/0] 0 ms L 2 10.131.159.225 MRU 1508 [Labels: explicit-null Exp: 0] 0 ms ! 3 10.131.159.234 4 ms The following example shows the command output when there is no explicit-null label shimming: switch# traceroute mpls ipv4 10.131.159.252/32 Tracing MPLS Label Switched Path to 10.131.159.252/32, timeout is 2 seconds Codes: '!' - success, 'Q' - request not sent, '.' - timeout, 'L' - labeled output interface, 'B' - unlabeled output interface, 'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch, 'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 'P' - no rx intf label prot, 'p' - premature termination of LSP, 'R' - transit router, 'X' - unknown return code, 'x' - return code 0 Type escape sequence to abort. 0 10.131.191.252 MRU 1496 [Labels: 16/18 Exp: 0/0] L 1 10.131.191.229 MRU 1508 [Labels: 18 Exp: 0] 4 ms L 2 10.131.159.225 MRU 1504 [Labels: implicit-null Exp: 0] 4 ms ! 3 10.131.159.234 4 ms Additional References for MPLS LSP Ping and Traceroute For additional information related to troubleshooting MPLS connectivity with MPLS LSP ping and traceroute, see the following sections: Related Documents MIBs Related Documents Related Topic Document Title Cisco NX-OS MPLS commands Cisco Nexus 7000 Series NX-OS MPLS Command Reference MIBs MIB MIBs Link No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. To locate and download MIBs for selected platforms, Cisco NX-OS releases, and feature sets, use the Cisco MIB Locator, found at the following URL: Feature History for MPLS LSP Ping and Traceroute Table 36-5 lists the release history for this feature. Table 36-5 Feature History for MPLS LSP Ping and Traceroute Feature Name Releases Feature Information MPLS LSP Ping/Traceroute for LDP/TE and LSP Ping for VCCV 6.2(2) MPLS LSP ping/traceroute for Label Distribution Protocol and traffic engineering (LDP/TE) and LSP ping for Virtual Circuit Connectivity Verification (VCCV) provide the capabilities to monitor label switched paths (LSPs) and quickly isolate Multiprotocol Label Switching (MPLS) forwarding problems. The following command was introduced or modified: ping mpls pseudowire, MPLS LSP ping and traceroute 5.2(1) This feature was introduced.

Packet loss rate between hosts. The following ping options are available: Gateway is ping visible: The gateway responds to ICMP echo request packets. This feature is enabled by default. Ping from gateway: You can use the ping command on the gateway. This feature is enabled by default. Gateway forwards pings: The gateway forwards ICMP echo request and echo response packets originating from an internal network, i.e., a network without default gateway. Note – If enabled, the ping settings also allow traceroute ICMP packets, even if the corresponding traceroute settings are disabled. Traceroute Settings The program traceroute is a computer network tool used to determine the route taken by packets across an IP network. It lists the IP addresses of the routers that were involved in transporting the packet. If the packet's route cannot be determined within a certain time frame, traceroute will report an asterisk (*) instead of the IP address. After a certain number of failures, the check will end. An interruption of the check can have many causes, but most likely it is caused by a firewall along the network path that blocks traceroute packets. The following traceroute options are available: Gateway is traceroute visible: The gateway responds to traceroute packets. Gateway forwards traceroute: The gateway forwards traceroute packets originating from an internal network, i.e., a network without default gateway. Note – The bridge mode in Sophos UTM uses the packet filter to allow the traffic to pass Sophos UTM, e.g., web surfing traffic. In this case, the options Allow ICMP through gateway, Gateway forwards pings and Gateway forwards traceroute will not work in bridge mode. Note – In addition, the ports for UNIX traceroute applications are opened, too. Note – If enabled, the traceroute settings also allow ping packets, even if the corresponding ping settings are disabled.

Continuous Traceroute To use the Continuous Traceroute feature of VisualRoute you need to do the following: 1) Enter the IP/host you want to perform a continuous traceroute for into the "trace" text box at the top of the VisualRoute interface. 2) Click the "More Tools" drop down menu and click the continuous traceroute icon. See below for an example: A continuous traceroute is a rolling, live traceroute which updates to reflect real-time changes to the monitored route. When the traceroute starts you will see the toolbar as shown below. This toolbar allows you to perform various tasks, for more information on what these buttons do click here. The drop down menu can be used to change the type of traceroute you are performing without starting a new one, the three options are shown below. If you choose the run every 1 minute option you can then click the 1 to change the value, for example run the traceroute every 5 minutes.

Verifying Connectivity with MPLS LSP Ping and Traceroute This chapter describes how to verify Multiprotocol Label Switching (MPLS) connectivity with the MPLS label switched protocol (LSP) ping and traceroute feature. This chapter includes the following sections: Finding Feature Information Information About MPLS LSP Ping and Traceroute Licensing Requirements for MPLS LSP Ping and Traceroute Prerequisites for MPLS LSP Ping and Traceroute Guidelines and Limitations for MPLS LSP Ping and Traceroute Configuring MPLS LSP Ping and Traceroute Troubleshooting Examples Using MPLS LSP Ping and Traceroute Additional References for MPLS LSP Ping and Traceroute Feature History for MPLS LSP Ping and Traceroute Finding Feature Information Your software release might not support all the features documented in this module. For the latest caveats and feature information, see the Bug Search Tool at and the release notes for your software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the “New and Changed Information” chapter or the Feature History table below. Information About MPLS LSP Ping and Traceroute .i.MPLS:ping; .i.MPLS:traceroute; MPLS LSP ping and traceroute helps operators to monitor label switched paths (LSPs) and quickly isolate MPLS forwarding problems. You use MPLS LSP ping and traceroute to test LSP connectivity for IPv4 Label Distribution Protocol (LDP) prefixes and Resource Reservation Protocol (RSVP) traffic engineering (TE) LSPs. Internet Control Message Protocol (ICMP) ping and traceroute are used to help diagnose the root cause when a forwarding failure occurs. However, ping and traceroute might not detect LSP failures because an ICMP packet can be forwarded through IP to the destination when an LSP breakage occurs. MPLS LSP ping and traceroute are well suited for identifying LSP breakages for the following reasons: An MPLS echo request packet cannot be forwarded through IP because its IP Time to Live (TTL) is set to 1 and its IP destination address field is set to a 127/8 address. The Forwarding Equivalence Class (FEC) being checked is not stored in the IP destination address field (as is the case of ICMP). MPLS echo request and reply packets test LSPs. The features described in this chapter are based on the IETF RFC 4379 Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures : .i.MPLS:echo request packets; .i.MPLS:echo reply packets; Echo request output interface control Echo request traffic pacing Echo request end-of-stack explicit-null label shimming Echo request

Of the fault condition. Licensing Requirements for MPLS LSP Ping and Traceroute Product License Requirement Cisco NX-OS MPLS LSP ping and traceroute require an MPLS license. For a complete explanation of the Cisco NX-OS licensing scheme and how to obtain and apply licenses, see the Cisco NX-OS Licensing Guide. Prerequisites for MPLS LSP Ping and Traceroute MPLS LSP ping and traceroute have the following prerequisites: You must install the MPLS license. Before you can run MPLS LSP ping and traceroute, ensure that the Intrusion Detection System (IDS) is disabled, specifically the option that drops packets if the IP address is in the reserved 127.x.x.x range. You must enable the MPLS LDP feature or the MPLS traffic engineering (TE) feature. Guidelines and Limitations for MPLS LSP Ping and Traceroute MPLS LSP ping and traceroute have the following configuration guidelines and limitations: You cannot use MPLS LSP ping to validate or trace MPLS VPNs. You cannot use MPLS LSP traceroute to troubleshoot LSPs that use TTL hiding. MPLS supports per-destination and per-packet (round robin) load balancing. If per-packet load balancing is in effect, you should not use MPLS LSP traceroute because during an LSP traceroute, a transit router makes consistency checks on the information supplied in the previous echo response from the directly connected upstream router. When you use round robin, you cannot control the path that an echo request packet takes in a way that allows a packet to be directed to TTL expire at a given router. Without that ability, the consistency check might fail during an LSP traceroute, and a consistency check failure return code might appear. A platform must support LSP ping and traceroute in order to respond to an MPLS echo request packet. Unless you enable the MPLS LSP Ping/Traceroute for LDP/TE, and LSP Ping for the virtual circuit connection verification (VCCV) feature along the entire path, you cannot get a reply if the request fails along the path at any node. The draft version on other devices in the network must be compatible with the draft version implemented on Cisco NX-OS. Earlier versions might not be compatible with later versions because of changes to type, length, and values (TLVs) without sufficient versioning information. You cannot use MPLS LSP traceroute to trace the path taken by Any Transport over MPLS (AToM) packets. However, you can use MPLS LSP traceroute to troubleshoot the Interior Gateway Protocol (IGP) LSP

Gate,...][-i device] [-m max_ttl] [-p port] [-s src_addr][-q nqueries] [-N squeries] [-t tos][-l flow_label] [-w waittime] [-z sendwait] [-UL] [-D][-P proto] [--sport=port] [-M method] [-O mod_options][--mtu] [--back]host [packet_len]How does traceroute command workstraceroute tracks the route packets taken from an IP network on their way to a given host. It utilizes the IP protocol's time to live (TTL) field and attempts to elicit an ICMP TIME_EXCEEDED response from each gateway along the path to the host. More can be checked on traceroute command Man Page.Also Read: Best Steps to Install Perl on RHEL/CentOS 8Example 1: How to Check traceroute command version on LinuxIf you want to check traceroute command version then you need to use traceroute --version command as shown below. As shown from below output, current traceroute command version is 2.0.22.[root@localhost ~]# traceroute --versionModern traceroute for Linux, version 2.0.22Copyright (c) 2008 Dmitry Butskoy, License: GPL v2 or any laterNOTE:Please note that here I am using root user to run all the below commands.You can use any user with sudo access to run all these commands. For more information Please check Step by Step: How to Add User to Sudoers to provide sudo access to the User.Example 2: How to trace google.com using traceroute command on LinuxIf you want to trace the path to a URL or Server then you need to use below traceroute command. In this example, we are trying to trace the path of google.com URL using traceroute google.com command as shown below.[root@localhost ~]# traceroute google.comtraceroute to google.com (172.217.163.46), 30 hops max, 60 byte packets1 gateway (192.168.0.1) 2.930 ms 4.297 ms 4.274 ms2 10.234.0.1 (10.234.0.1) 4.699 ms 5.515 ms 5.187 ms3 vod.corp.us (202.10.11.43) 4.991 ms 4.842 ms 4.790 ms4 24.11.145.5.static-vegas.nl.net.us (24.11.145.5) 7.530 ms 7.098 ms 6.899 ms5 172.31.167.58 (172.31.167.58) 17.318 ms 16.652 ms 16.489 ms6 14.140.100.6.static-vsnl.net.us (14.140.100.6) 16.250