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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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34 views

Whether the traceroute command only can check “to” path, can not check “back” path?

How to detect the router path of traffic? I use the ipip.net for ICMP traffic: I want to check the out path and back path. such as I have A address 60.248.41.135 and B address 103.248.41.135. ...
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1answer
21 views

how does Trace route packet work

I am fining difficulties understanding trace route command how does trace route works from source to a destination? how the routers reply to the source with their IP? thank you
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2answers
38 views

Explanation of traceroute

Can anyone help me to explain the results of this traceroute. Why on hop 2 will latency suddenly increase? and decreases at hop 3 and will rise significantly to hop to 8.
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1answer
39 views

Why there still need a parenthesis contains it again in traceroute logs?

I traceroute to 104.210.32.76: Traceroute Starting… traceroute to 104.210.32.76 (104.210.32.76), 64 hops max, 72 byte packets 1 10.10.10.1 (10.10.10.1) 25.326 ms 1.344 ms 1.135 ms 2 100.64.0....
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2answers
38 views

How does traceroute identify destinations to 'hop' to? [duplicate]

When using the traceroute command. For example: $ traceroute google.com The output I get shows hop No. | hostname (ip) | latency 1 | latency 2 | latency 3 Which for google shows the following: ...
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1answer
24 views

Are traceroute hop latency measurements relative to the previous hop or to the origin?

With traceroute output of this: traceroute to google.com (216.58.223.14), 64 hops max, 52 byte packets 1 192.168.119.1 (192.168.119.1) 1.321 ms 0.980 ms 0.936 ms 2 rtr3-c16-dc1.macrolan.co.za (...
0
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1answer
30 views

How frequently do request/response traceroute paths differ? [closed]

If you use the 'ping' command in a terminal, how frequently (if ever) do the network paths to/from the destination differ? What could cause such paths to differ?
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2answers
343 views

Why there are ip(ip) and domain(ip) 's difference and multi rows records in the traceroute?

In the traceroute command: $ traceroute 104.43.54.2 traceroute to 104.43.54.2 (104.43.54.2), 64 hops max, 52 byte packets 1 10.10.10.1 (10.10.10.1) 4.852 ms 4.623 ms 1.588 ms 2 100.64.0.1 (100....
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2answers
35 views

Does RTT in same network can be larger suddenly in tracert?

For the homework, I executed tracert command in the cmd to a specific site. I got the result and there was a sudden increasing point, but it was strange. I'm Korean and I used tracert to US site so ...
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2answers
58 views

Why does ip routing not take an even remotely direct route?

I ran a traceroute on a url to a server we own in New York. I'm in central Florida. Traceroute showed the request being directed to west Florida and then far south Florida before finally being ...
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1answer
81 views

Why does traceroute gives different number of hops for different protocols used?

While exploring traceroute with different protocols, it gave me the following response: For TCP: user@200411DC0:~$ sudo traceroute -T facebook.com traceroute to facebook.com (157.240.16.35), 30 hops ...
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0answers
43 views

Traceroute packets processing behavior

A traceroute initiate for NATed IP address 10.12.1.10 from a router that is outside from AS. This traceroute packet reaches at native BGP peer router where this NAT IP is configured at Firewall. ...
0
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1answer
32 views

Router - can I remotely force a router to send my packets through a specific route? (in packet/network layer) [closed]

I'm a newbie in network programming in C/C++ and I'm working on raw sockets to program a simple ping or traceroute application as they are written in common network programming books. Programs like ...
1
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1answer
111 views

How would you map a network at layer 2 without CDP or LLDP?

I'm on an ASA right now and can path my directly connected next hop devices via IP address, but I want to make sure there isn't a switch in between. Another related question, when I "show arp" it ...
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1answer
107 views

Tracert getting timeout on second packet consistenly

I'm on a vpn and tracing to virtualmachines that live in the VPN Server. I've been experiencing slow queries, when they should be fast. below is what the trace is returning. I'm curious as to why the ...
4
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1answer
515 views

difference between reverse, forwarding and return path on traceroute

As described on the title, I can't make difference between reverse, forwarding and return path, especially between reverse and return path. Also, how the RTT is affected by the reverse, forwarding ...
3
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1answer
65 views

Same hop appears 4 times on a traceroute [closed]

When I traceroute bbc.co.uk in my home Network the first hop appears 4 times. What could be causing this ? @Latitude-7480 ~ $ tracepath bbc.co.uk 1?: [LOCALHOST] ...
2
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1answer
48 views

Traceroute for http sites endless loop

I used following command - traceroute -m 255 www.bbc.com and result is an endless loop. I also tried on some other http sites, same result. I also used online traceroute service like monitis which ...
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3answers
74 views

Spoofed Tunnel Route

What does it mean when tracert always shows a single long jump? The route below is always the same except the last hop goes directly to any destination IP address that I choose. And, how does the ...
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3answers
169 views

Traceroute inside a per packet load balancing based infrastructure

Could you confirm that in an infrastructure configured with "per packet" load balancing on the Routers (same route same metric), the usage of traceroute become unusable ? In this case the ...
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2answers
203 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 '....
3
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1answer
705 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
35 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
103 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
415 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
53 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
485 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
116 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
329 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
85 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 ?
1
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2answers
341 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
342 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
142 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. ...
0
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1answer
55 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: __________ __________ _____________ |...
1
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3answers
255 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 ...
1
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3answers
340 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 ...
1
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1answer
127 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 ...
1
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3answers
473 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
94 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
589 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
317 views

different between “show ip bgp” command and traceroute

base on following results from route-views ------------------------------------------------------------------------------------------------------------------------------------------------------------...
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2answers
2k 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 ...
0
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2answers
650 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 ...
2
votes
2answers
84 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 ...
1
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1answer
295 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
48 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 ...
1
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1answer
101 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
90 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
196 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
2
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1answer
319 views

TCP Traceroute with actual TCP session

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 ...