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Questions tagged [traceroute]

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The packet goes through the other router

I want to connect two hosts in parallel with two different models of virtual routers. These are made redundant by VRRP. Originally, packets are sent through only one of the routers. However, when the ...
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Why do traceroutes start with the same path? [migrated]

I'm curious as to why all traceroutes start with the same path. For example, if I want to do a traceroute from my current location to www.google.com and another one to www.bbc.co.uk, the first few ...
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Different traceroute response times for same path

When troubleshooting for slow Internet speed on one computer, I am having systematic slower response times between two computers when running tacert, for any domain.They are both connected to the same ...
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traceroute: sometimes routers don't respond and user sees timeouts

I'm an admin of small network and I'm investigating a problem my users complain about. The root of their complaints is traceroute: sometimes routers along the path simply don't respond to traceroute ...
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Unable to ssh over openvpn

I have a setup available on AWS done by making use of this link: https://aws.amazon.com/blogs/awsmarketplace/setting-up-openvpn-access-server-in-amazon-vpc/ However, over VPN, I am unable to reach to ...
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Traceroute - Header Link CURL result Issue

We have systematic CURLs run every 15 mins - 2 hours from this system and logging their status. Every other CURL for the past 2 months has succeeded except this. Is there a way to identify why this ...
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1 answer
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Traceroute works but nc fails - Where is my port being blocked?

I am trying to troubleshoot two Azure VNETs that have been peered together. Lets call these VNETs A and B. There are multiple services running on a VM in VNET A on different ports. I am trying to ...
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Does traceroute use the same path?

I was a little bit confused about the use of traceroute. According to this The traceroute command is used to see how packets are getting routed. It works by sending packets with increasing TTL values,...
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Subdomain with variable IP

Subdomains like http://3qax.munzer.webproxy.idc-lorien-apiver01-repay-action.bh-arppofind.comssets.mealcardhss-int-bh-awwwppofind.wire.2.homeetingroom.walmartmobile.cn presents a behavior that when I ...
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Why traceroute with different arguments makes different routes?

I was studying how traceroute works and now im feeling kinda stuck. sudo traceroute -T aws.com traceroute to aws.com (13.227.211.129), 30 hops max, 60 byte packets 1 * * * 2 100.64.0.103 (100.64.0....
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What is this private LAN address accessible through my ISP?

Recently some websites I regularly visit (most recently docker.com, atlasobscura.com; both of these sites return an issue with a fortinet-ca2 certificate) have started showing certificate issues on my ...
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Ping and tracert misbehaving on my device only

I'm posting this here instead of the networking forum because the issue is isolated on my PC Long story short: Pinging anything always results in a successful reply from my private IP Any 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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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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2 votes
3 answers
753 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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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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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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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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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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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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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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2 votes
1 answer
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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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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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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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7 votes
2 answers
2k 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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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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1 answer
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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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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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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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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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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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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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3 answers
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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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-1 votes
1 answer
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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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-1 votes
1 answer
490 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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1 vote
0 answers
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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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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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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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4 votes
2 answers
926 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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3 votes
3 answers
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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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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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-2 votes
2 answers
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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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0 votes
1 answer
395 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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3 answers
6k 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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1 vote
1 answer
527 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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1 vote
1 answer
24k 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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1 vote
1 answer
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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1 answer
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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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1 answer
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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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1 vote
1 answer
1k 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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