Questions tagged [traceroute]

For questions about trace routing where, for instance, you are troubleshooting routing issues or have problems using the traceroute command via CLI on a network device.

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231 views

Why traceroute is still Used?

currenty I'm reading an article about 'Paris traceroute' , as i understood The Classical Traceroute give inexact information about the path that a packet traverse , 'incorrect links , missed nodes '....
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1answer
4k views

Traceroute UDP port question

I know, that traceroute uses UDP, and for destination port it starts with 33434. Then, with each next hop it increments the destination port number by 1. The questions is: why does traceroute need to ...
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1answer
44 views

To what degree does the variance of the latency for the three ICMP messages sent back per hop in a traceroute matter?

Does the variance of the latency for the three ICMP messages sent back for each hop in a traceroute help to troubleshoot issues?
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2answers
596 views

Traceroute program that does not rely on ICMP echo requests?

Is there any Traceroute program that does not rely on ICMP echo requests? The question is very straight forward, and I can't get into more details at the moment.
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2answers
1k views

Trace Route RTO in one hop but next hop works

Today when I was doing tracert, in the 6th Hop I get RTO but my next hop seems to be reachable. How come it works? 6 * * * Request Timed Out 7 58ms 58ms ...
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1answer
69 views

cisco network meanings and traceroute

I have a small network here. The connection from router 1 to router 3 is relevant. I have two questions in one. On the one hand I would be interested, why at Cisco between the routers always this red ...
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1answer
1k views

No response to ICMP (traceroute)

192.168.1.37 can ping 192.168.0.22, but can't ping 192.168.0.240 subnet masks are 255.255.255.0 on all hosts in question Switch/gateway in the middle (192.168.1.253) can ping both of these ...
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1answer
379 views

Slower hops in traceroute

What are the main reasons why some routers that appear in the traceroute output have a greater round trip time?
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1answer
543 views

Difference in number of hops calculated using ping vs traceroute

I pinged a host using the minimum TTL value that didn't elicit a 'Time to live exceeded' response to calculate the number of hops between us. When I used traceroute, that number was a little bigger. ...
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2answers
233 views

how to Prevent hosts to traceroute their G.W ?

I want to prevent all hosts from seeing the core router when they do traceroute , knowing that I'm using cisco router , any idea to do this ?
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2answers
502 views

Traceroute to another interface of a router

When I try to traceroute to a remote server, I found that most likely the first router interface where the packet arrives responds to traceroute. Is it possible to ask another interface of the router ...
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2answers
1k views

Traceroute only showing private layer3 hops and then direct end destination

I am doing a traceroute to salesforce.com, google.com and I see all the layer hops to my Firewall and then one hop to final destination- which is incorrect. I am not seeing any of the intermediate ...
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1answer
497 views

Trace route does not complete and applicatin fails to connect but website works in browser [closed]

I am trying to narrow down a problem with intermittent connectivity issues to a remote service hosted via HTTPS. The application frequently fails to establish the SSL tunnel during the CONNECT phase. ...
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1answer
63 views

Connect to the second NIC of a remote PC and remotely configure router

Thanks in advance for the time you will spend helping me. I have set up a testing environment with the following structure: __________ __________ _____________ |...
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3answers
792 views

How to differentiate between UDP traceroute packet and the normal data traffic?

I am a programmer and we can filter out the packets in the router to manipulate the IP or MPLS headers. My question is there any way to distinguish between UDP 1 byte traceroute data vs user traffic ...
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3answers
512 views

Windows implementation of traceroute (tracert)

Unlike it's Unix/Linux counterpart, the Windows tracert software doesn't seem to have flags to switch between ICMP and UDP. Does anyone know for certain which it uses? I am having trouble with two ...
2
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1answer
240 views

Traceroute of Router's own serial port

I got two routers on my network and I am pinging one router's serial port ip address from that router itself. by checking traceroute I found ping is going outside to neighbor router which is directly ...
2
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3answers
1k views

Private IP inside internet?

Firstly sorry if this question has already been asked. While playing with traceroute, I came across something really strange... traceroute to 185.75.143.25 gives: - 10.214.255.254 - 10.255.255.254 ...
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1answer
163 views

Is using traceroute with ICMP echo messages valid?

Theory says that there shouldn't be any ICMP error messages for ICMP messages. When sending ICMP echo requests in traceroute, doesn't this break this rule?
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2answers
826 views

Can we measure Round trip time between two machines without using either of them?

I have two machines with IP1 and IP2 addresses. Is it possible to measure the round trip time for the packets to travel between these two machines from a machine with a different IP address?
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2answers
566 views

different between “show ip bgp” command and traceroute

base on following results from route-views ------------------------------------------------------------------------------------------------------------------------------------------------------------...
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2answers
4k views

Preventing a Cisco router from appearing in a traceroute

I am trying to prevent a Cisco 2911 router's IP address from appearing in an inbound traceroute. I have configured the line: no ip unreachables on the Internet-facing interface, and while this ...
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2answers
1k views

Traceroute IP-address mismatch

I'm doing some traceroute scans and just realized, that there is an IP-address mismatch. Closer, my public IP-address doesn't match with the next HOP IP-address of my ISP. So, when I scan the public ...
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2answers
96 views

Why do the same websites get routed in two widely different paths?

Depending on the time, when I open a website and do a traceroute, I notice that website goes to a different path than the usual, and some websites just never open. Why the same network alternate ...
2
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1answer
544 views

What is the significance of number or probes in traceroute?

I am aware that -p sets the number of probes in a traceroute. I recently did the following traceroute with different values of -p i.e 1 and 3 (the default value). Can you explain the increase in the ...
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0answers
58 views

Route discovery between master slave and slave slave [closed]

I have a master node and different slave nodes. I want to perform traceroute from each slave to every other slave and master and send this route to master periodically with timestamp. Bruteforce ...
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1answer
109 views

failed to ping a local peer on the windows host with 2 NICs when peer is re-powered on [closed]

Configuration In our system, the Windows PC has two NICs, one for WAN and one for LAN (no gateway). For the LAN side, a Linux PC is connected through two switches. Also, switch2 is powered on/off ...
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1answer
199 views

HTTP server responds with TTL- exceeded for TCP-SYN till TTL is increased by +2 from the actual number of hops

Trying to traceroute an HTTP server using TCP-SYN packets. There are 13 hops between the two hosts, but the server responds with TTL-exceeded for TTL=13 and TTL=14. It replies with TCP SYN-ACK only ...
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1answer
395 views

ICMP TTL-exceeded header shows Length: 243 [Length of original datagram: 972] in wireshark. Original TCP-SYN was 58 Bytes

TCP SYN for traceroute ICMP header shows Length 243 [Length of original datagram: 972] Not sure how this works, as I sent a TCP-SYN of 58 Bytes frame. Please explain
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1answer
446 views

TCP Traceroute with actual TCP session [closed]

Has anyone ever found a tool that performs a TCP traceroute with an actual established TCP session? I can launch a server/client on each end, if required. tcptraceroute & mtr aren't candidates ...
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1answer
962 views

How do you use strict/lose source tracerouting with Cisco IOS

I have been trying to guess the syntax but, I can't figure out how to do it Based on the above diagram, what should be the traceroute command on R1 to force the traffic go via R1->R2->R4?
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1answer
2k views

Using ping/tracert to get ISP information

Is it possible to use ping or tracert (Networking tools) to approximate any of the following: Propagation delay to ISP Distance to ISP Link bit rate
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1answer
83 views

Is this trace normal? [closed]

I was trying to access Paypal dev blog but got a connection timed out error instead. Other sites are working fine. So I did a trace route if I would see something flaky. Indeed something came up. ...
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1answer
2k views

Traceroute showing destination as next hop, even though it isn't, then no response

I'm trying to test a new B2B VPN that I've configured. I tried to ping to it from a host on my end, which fails. So I ran a traceroute that show the packets dying out at a multi-layer switch right ...
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3answers
9k views

Tips on analyzing traceroute readings

I'm pretty new to networking and I'm currently playing about with the traceroute command on the Windows command line. Do you happen to have any tips/know any resources that are helpful in learning how ...
3
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1answer
236 views

how to implement traceroute without using TTL?

how to implement traceroute without using TTL? This is an interview question. We all knew Traceroute uses TTL to get the routing path. The question is how to implement traceroute without using TTL. ...
3
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3answers
226 views

Basic (probably) question on traceroute

I was trying to do tracert, and instead of getting ip addresses like I'm used to, all I see is this (below). Can anyone tell me what is going on? There are no spaces in the command, I just can't post ...
3
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1answer
638 views

Does traceroute show the IP address of the entry port? or exit port?

Does traceroute show the IP address of the entry port? or exit port? For example, if there is an intermediary router in the path with 198.28.56.18 facing the source (entry port), and 65.86.24.136 ...
2
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2answers
3k views

Difference in number of hops in Traceroute

I was experimenting with some of the network monitoring commands in cmd and I noticed that there's a significant difference in the number of hops in the output of tracert for different hosts. For ...
3
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2answers
824 views

ping, traceroute not working [closed]

I was going through a Networking course online and they instructed me to try ping and traceroute commands on Linux for network checking. I have Fedora OS v22 and am using WLAN Dlink Router for ...
5
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2answers
2k views

Route does not work / LAN port not reachable

Current Network I have the following network situation: Internet | 81.x.x.x (WAN) Modem / DSL Router 1 192.168.1.1 (LAN) | +-----------------------------+ | ...
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3answers
735 views

Cannot access certain web page. Ping succeded traceroute didn't

This is my first question on forums at all. I work as a network support engineer and I have a little issue at work and I would really appreciate advice from you. Cannot access the url www.reach2.org ...
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2answers
2k views

trace route result same hop but different destination ip

I do traceroute in my router and I found result like this traceroute to 114.0.36.130, 30 hops max, 40 byte packets 1 114.0.17.30 (114.0.17.30) 3.49 ms 14.2 ms 2.65 ms 2 114.0.27.1 (...
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2answers
3k views

traceroute -A - how does the lookup work?

How does the traceroute -A command work? How does the program look up the ASN? On which protocols or databases does the query depend? Can I recreate the -A option? I am using this version: Modern ...
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0answers
124 views

Traceroute probes

In traceroute, when a * is recieved, it could mean the router didn't reply due to various reasons- either the router is busy processing other packets or ICMP is blocked. I think few ISPs configure ...
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1answer
480 views

traceroute through Twice NAT'ing

interesting traceroute I am getting thru a firewall where we are NAT'ing both Source and Destination. I am wondering if it is possible to get this to work. We are trying to set up a traceroute monitor ...
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1answer
137 views

Does the TTL decrease over a crossover cable?

I have a little embedded device directly connected to a laptop via a crossover cable. I'm monitoring the traffic between the two using Wireshark and I witness a TTL of 30 for TCP packets coming from ...
2
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1answer
274 views

Asterix in the traceroute

I'm having a bit of trouble getting my routing right. I have an HP v1910 switch with a a few VLAN interfaces. Let's take the first VLAN, VLAN10, which runs all my laptops etc... All VLANs connect via ...
2
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1answer
230 views

Can a PC know information about the incoming and outgoing route of packet?

Dear all Communications Experts, I am wondering whether we can know the information of both incoming and outgoing route of a packet from/to a particular server or not? In other words, is there any way ...
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4answers
9k views

Are ping-times directly related to location/distance?

Suppose I want to determine if an IP is located in my country, without a third-party servvice. Could I estimate that to a certain degree by measuring ping times? Or is it better to look at the number ...