Questions tagged [traceroute]

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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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1answer
263 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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29 views

DNS Settings Overidden by ISP during PPPOE Authentication?

I have a TP Link SafeStream router, I have set my DNS setting to 1.1.1.1 in my router under the WAN configuration, in the same page that the PPPOE Authentication is. Now it is connecting properly, ...
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0answers
54 views

Packet Drops with normal configuration

I have a problem that I can't reach an IP while using traceroute but by identify the device I have response traceroute -i team1 10.122.244.1 traceroute to 10.122.244.1 (10.122.244.1), 30 hops max, ...
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15 views

Destination Servers Unreachable without any errors

I have a server that was reaching another server but after reboot they can't reach each other , below you will find he configuration . Source :10.18.33.122 Destination :10.122.244.1 netstat -rn ...
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1answer
91 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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0answers
44 views

hard packet loss through linux soft router

all! Now I trying setting up soft-router on Linux.. :( # ip rule 0: from all lookup local 20000: from all iif lo lookup main # Thanks to wurtel ! 32760: from all iif lo lookup rt2 # for local ...
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1answer
225 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 ...
7
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1answer
500 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
36 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 ...
2
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1answer
416 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
217 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
58 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 ...
0
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1answer
41 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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59 views

Transfering data from server is very slow from certain IPs

I've encountered a strange situation, and I am buffled on how to solve this. I have a dedicated server at Dacentec (let's call it Dacentec Server), which is running a CentOS 7 operating system, on ...
0
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1answer
383 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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0answers
47 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
1k 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
362 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 ...
-1
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1answer
289 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
28 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
48 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
36 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 ...
4
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2answers
396 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 * * * ...
3
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3answers
920 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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0answers
68 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
149 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 ...
0
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1answer
140 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
3k 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 (...
1
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1answer
436 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
12k 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
807 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 ...
0
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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 ...
0
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1answer
352 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 ...
1
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1answer
462 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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0answers
524 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 ...
0
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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 ...
0
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1answer
907 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" ...
1
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2answers
531 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 ...
3
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1answer
690 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 ...
1
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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 ...
2
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1answer
885 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
101 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
90 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 ...
0
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0answers
12k 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 ...
1
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3answers
3k 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: ...
2
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2answers
2k views

why Ethernet MTU size is 1500? [closed]

Can somebody explain that why the Ethernet Maximum Transmission Unit was chosen to be 1500 bytes (why exactly 1500) ? It might have some historical reason.
1
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1answer
605 views

fast ping response, latency on traceroute

I have a very strange problem. In short pings to my wireless AP are low (around 1ms), however, once I do a traceroute, the latency to the AP (1st hop) suddenly jumps to ~1000ms. Any ideas what may be ...
5
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3answers
3k views

How is possible that the web site is down but the traceroute is ok?

I have a web site at BlueHost ("Pro" plan) that is down often. Firefox says: The connection has timed out The server is taking too long to respond. The site could be temporarily unavailable or ...
1
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1answer
656 views

MTR doesn't recognize IPs of hops

I am building an integrated network operations portal that ties together information from a number of resources. One thing I would like to understand is the topology of the network, and I am trying ...