Questions tagged [traceroute]

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when router sends ICMP protocol error message how does it set it's own TTL?

when using (traceroute -q 1 serverAddress), we know that it starts with TTL(Time to Live) = 1. when it goes through router, the router decrements TTL by 1. If TTL becomes 0 at that router, it sends ...
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1answer
37 views

opened port for tcp/udp using iptables for traceroute, but it still fails, why?

Traceroute to the server fails, this is description of the problem: root@newTralev ~ # ifconfig eth0 Link encap:Ethernet HWaddr 74:d0:2b:9a:85:74 inet addr:176.9.18.37 Bcast:176.9....
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3answers
203 views

Can Traceroute detect a load balancer?

Can traceroute detect a load balancer sitting between an application server and a database? After running a traceroute from application server to database I only received one hop. The hop was the ...
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1answer
77 views

Why does RCN route addresses in 10.0.0.0/8 to some public machine?

I have a colleague who uses RCN (no idea if that's relevant). When he runs traceroute on a private IP address like 10.22.32.136, it seems to get routed to some "public" machine. For example, ...
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60 views

How to interpret asterisks in a tracert command. Does this sugest an issue?

we have a 3rd party application installed on our application server, "myservername." The 3rd part company tells us that the application is very chatty and quickly performs poorly unless ...
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1answer
30 views

Two or more hosts in traceroute answer

Hi I have strange behavior of a traceroute to one of my public IP's In one of a line I have multiple hostnames with timing like in the folowing example, on the 5th line traceroute to dns.abc.com (111....
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1answer
46 views

Why would traceroute print destination ip for each hop instead of router ip?

$ traceroute -n 8.8.8.8 traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets 1 8.8.8.8 3.158 ms 4.246 ms 5.054 ms 2 * * * 3 8.8.8.8 9.121 ms 10.245 ms 9.327 ms 4 8.8.8.8 12.134 ...
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2answers
270 views

What is blocking my mysql connection?

We run several docker images on a VM. sudo iptables -S shows a lot of docker networking. We try to connect to an external MySQL database in another net. mysql --host=mysql.example.org --user=thisuser ...
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25 views

Allow an ip which comcast xfinity firewall is blocking

I am using a windows host and I am trying to conect it to a linux server. We have a Comcast Xfinity firewall on our network at 10.0.0.1, When I try to ping the server from the Windows Host, the ...
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794 views

How to trace UDP blocking for DNS port 53

Recently both of our DNS servers stopped responding to incoming UDP on port 53, tested with dig and it works with TCP. They both have common ISP. Is there any way to traverse route and find out ...
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1answer
348 views

What may cause a request being sent with a TTL of 64 to fail on connection to a destination ip that traceroute shows is 33 hops away?

From within a docker container (running ubuntu 18) running on AWS ECS I'm attempting to establish a connection to an outside data center. We've troubleshot the issue to where we believe it's the ...
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1answer
204 views

Why the packet loss of ping and traceroute is different

I have an IP address on 12th hop. When I send an icmp request packet with TTL 11 to this IP, the packet loss at the 11th hop is 0%. However, if I ping the IP address of the 11th hop, or use TTL 11 to ...
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1answer
506 views

Strange traceroute behavior when using iptables/nat to redirect an IP

At a client of mine, who has a LAN of 10.0.1.0/24, they have a Windows machine with ip 10.0.1.8 that hosts a rather old legacy application (that of course no one has the source code for) that wants to ...
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2answers
1k views

Traceroute vs tracert

I'm having the following issue: Running tracert from Windows 7 returns all the hops to a given server. Running traceroute from Fedora 30, using the same connection and the same destination, ...
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1answer
57 views

Why this ip range is only showing * * *?

I've got a question. When I try to do this on GNU/Linux: traceroute -m 255 -I [the_ip] Then I get this: 192.0.0.1 (192.0.0.1) 6.788 ms 6.774 ms 6.781 ms 62.214.36.201 (62.214.36.201) 7.672 ms ...
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1answer
1k views

How is the number of routers between source and destination known beforehand?

I was studying Computer Networking book of Kurose and Ross and under Traceroute subsection I've read following: More specifically, suppose there are N - 1 routers between the source and the ...
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1answer
400 views

First traceroute hop always slow. Why?

Browsers in my LAN, no matter the device, are always slow to connect to internet servers, but after the connection is made webpages download rather fast. Speedtest.net reports what I would call a ...
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0answers
109 views

Why is my data throughput only 1G of possible 10G if I setup an ethernet bridge?

My setup is a Windows 10 PC with 10G card (LR-LINK 6880BT) and a Synology DS1618+ NAS with 10G card (Synology E10G18-T1). Both 10G ports are connected directly to avoid buying a 10G switch. A) How ...
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1answer
64 views

Adding a hop using `ip route add` makes traceroute stop at the first hop

I am practising for LFCS. I have two virtual machines, ubuntu 18.04 both. On machine1, when i run traceroute 8.8.8.8 I have a normal output. When on machine1 I run sudo ip route add 8.8.0.0/16 ...
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1answer
796 views

Traceroute to check NTP - possible?

In the past I mostly used tcptraceroute to check http and ssh. Now I need to check if my host can reach the NTP server. Is this possible at all? I have two machines. At application level I see: ...
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60 views

Latency jumps in first, middle and last mile of path

I work for SD-WAN company providing an all in one solution edge router(Like FORTINET but not FORTINET). We have one customer in particular that has such a hard time with our services i.e. gift card ...
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3answers
2k views

TTL Changes During Continuous Ping

We use Viasat and have the modem plugged directly into a linux based load balancer. I SSH'ed into the loadbalancer using putty and pinged google When I pinged google this is the result: - PING 8.8....
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1answer
660 views

How do I do traceroute/tracepath without any admin privileges?

Basically, I need to "trace a packet from my computer to the host" to diagnose a network issue and I do not need any fancy additional functionality. Redirect me to the right place if this is not the ...
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1answer
429 views

Tracert high latency [duplicate]

I have used tracert command to check local network status, at the second hop I get random- high numbers for latency,(attached file), but when I use ping the total latency has an average of 1ms. What ...
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0answers
29 views

Layer 3 Device ICMP behavior and impact on tracert

Is it possible to configure a layer 3 device to set the TTL of all ICMP echo request packets to zero and not send out ICMP Time Exceeded message ? If so, wouldn't this make it impossible for tracert ...
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0answers
62 views

Connection timout between two IP troubleshooting

I have a client with a webserver and a VPS server with a webserver and a mailserver. These machines have to exchange data via REST API but I have a problem, they are not reachable each other over HTTP ...
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0answers
48 views

Tracert doesn't return to prompt after “trace complete”?

I am trying to run some tracert via cmd in Windows, but both manually and via a batch script the trace doesn't progress after "trace complete". In the script it won't move to the next trace and ...
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2answers
578 views

tcptraceroute: Hop does not reply

AFAIK tcptraceroute is the best tool to check if a firewall is blocking the tcp connection to a service. (If you know a better tool, please let leave a comment) Some hops do not reply. See * * * ...
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3answers
2k views

Why does traceroute ended with additional hop after the destination?

If nothing block the traffic, traceroute normally ends with the destination IP as the last hop. (10.1.1.10 in this case) Normal traceroute would be like this. user@linux:~$ traceroute 10.1.1.10 ...
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70 views

website hosted in aws ec2 is not loading

I have a website hosted in aws ec2 which stopped loading since few days onwards no clue whatsoever, below the output of traceroute please help Tracing route to 126news.com [18.221.68.117] over a ...
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2answers
185 views

Add hop in tracert

Basically, I'm interested how to make one of my servers hop in tracert. My first server is located within DC in France My second server if located within DC in Russia I want my 1st server to be in ...
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1answer
248 views

Some IP addresses are unreachable due to invalid route

I want to connect to remote machines. The problem is that I can connect to every machine except one. After some invertigation I found that problem is in route. Here is example: PS C:\Users\Alex> ...
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3answers
4k views

Traceroute not returning result whereas ssh is working fine

Maybe it's a dumb question, so please bear with me as I am novice to networking. While trying to debug a connection problem to a server today I observed the following two things - I am able to ssh (...
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1answer
482 views

Why does traceroute -T add hops and intermediary asterisks?

Behold, traceroute without any options: $ traceroute google.com traceroute to google.com (172.217.4.142), 30 hops max, 60 byte packets 1 10.14.62.1 (10.14.62.1) 0.619 ms 0.685 ms 0.806 ms 2 10....
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1answer
17k views

telnet: Unable to connect to remote host: Connection timed out

Setting up a postfix server, trying to figure out why it's not working. Here's a command that I ran while troubleshooting. I expected to be able to connect, but could not. lol@foldingmachine:~$ ...
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1answer
1k views

Where does tracert get its FQDN? And why can they differ?

I'm running Windows 2012 R2 on four different virtual machines. I'm testing connectivity to a single IP address, e.g. 12.13.14.15. Telnet isn't working, so I'm running tracerts and capturing the ...
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1answer
1k views

Ping request timeout, followed by >10s times from laptop, but not from router

Using my router's built-in Ping diagnostic, I can ping sites and get times <100ms routinely. Using my laptop, or any other device, wired or wireless, I first receive a bunch of Request Timeout ...
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1answer
408 views

SSH doesnt work with both ends connected to VPN [closed]

I have an Arch Linux SSH/SFTP server connected to a PrivateInternetAccess VPN which I want to ssh into from an android phone. The problem is, if the phone is also connected to a PIA VPN, SSH hangs and ...
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1answer
789 views

Bad destination address: foo.bar.local

I don't understand why I get "Bad destination address" in the end. DNS works: root@pc:~# nslookup foo.bar.local Server: 127.0.1.1 Address: 127.0.1.1#53 Name: foo.bar.local Address: 10.100....
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664 views

Static route with local IP does not route locally

VPN client breaks routing table on Server by routing local IP to VPN subnetwork. I can't change anything in VPN client so I'm trying to restore route to my host so that apps using 192.168.1.2 as ...
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2answers
2k views

Is there a utility or way to get the PMTU/MTU of a remote system quickly?

Is there a utility or linux built in to get the PMTU/MTU of a remote system quickly (sub 1 second preferably)? If so what is it and what syntax does it require? Google searches have not been my ...
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1answer
1k views

Why would tracert command in Windows timeout except for last hop? [closed]

On my Windows 10 system on company network any time I attempt to run a basic tracert command to an internal or external resource (e.g. google.com) each identified hop results in "Request timed out" ...
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2answers
875 views

WHy is tracert working even though I changed my DNS settings to use a bad nameserver?

In my Network Settings in Windows, I've set my DNS settings to use addresses 192.168.2.239 and 192.168.2.238. These are both non-existing DNS servers. In cmd if I do nslookup www.google.com I get ...
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1answer
908 views

How can a server trace a route to a client?

I understand how a client can trace a route to a server (using traceroute, or tracert). But is there a way for a server to trace a route to a client? The problem is that I have a group of internet ...
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1answer
2k views

how to test if aws nat gateway static ip is up?

I started two EC2 instances in an Elastic Beanstalk autoscaling group in a VPC. The app on these EC2 instances needs to connect to a third party service that uses an IP address whitelist to allow ...
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1answer
1k views

Traceroute time is too long

I m using RHEL 6.5 and eth0 interaface Interface Ip is 100.x.x.x and when i traceroute to 100.x.x.x it showing one hop that too ip address of interface itself. For eg traceroute to 100.65.111.14 ...
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0answers
102 views

Slowness communicating with IP address hosted by Google Cloud via specific Internet Service Provider

We are running an app and website on Google Cloud servers and beginning a couple of days ago users running on a specific internet service provider (Time Warner Cable) are experiencing very slow ...
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2answers
103 views

Should traceroute be used to diagnose network latency issues?

I ran the traceroute command from Server A to Server B, two of the hops display a latency between 250ms to 480ms. However when running ping from Server A to Server B, the response is always within ...
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0answers
15k views

TCP traceroute to specific port?

Is it possible to use tcptraceroute to probe a certain port? The documentation in the man pages seems to suggest that the '-p' port flag is for UDP, and when used with tcptraceroute, is for specifying ...
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3answers
5k views

How does traceroute -T -p work?

My goal is to check weather the destination port (MySQL 3306) is able to connect. First, I tried with telnet but it showed No route to host $ telnet dest.com 3306 Trying <dest_ip>... telnet: ...