Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [traceroute]

89 questions
2
votes
1 answer

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 probes and users see timeouts (those *s in place…
ico
  • 21
  • 1
2
votes
3 answers

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 destination database
ASalas
  • 21
  • 2
2
votes
1 answer

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 extra hop added by the local docker network that is…
cmikeb1
  • 123
  • 4
1
vote
1 answer

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 connect to a hard-coded IP address of…
gordonfish
  • 11
  • 3
1
vote
0 answers

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 the 10G connection works: NAS eth4 (10G) is set to…
mgutt
  • 503
  • 1
  • 7
  • 24
1
vote
0 answers

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 to finish for any path that got routed through it…
user1086516
  • 111
  • 2
1
vote
0 answers

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 manually it wont return to the prompt. Anyone had this…
Rob
  • 11
  • 1
1
vote
1 answer

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 10.14.255.29 (10.14.255.29) 0.492 ms 0.508 ms …
davidrmcharles
  • 111
  • 4
1
vote
1 answer

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:~$ telnet a.mx.mail.yahoo.com 25 Trying…
jcarpenter2
  • 253
  • 1
  • 4
  • 14
1
vote
1 answer

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 results to send to the networking team. Tracert…
John Wu
  • 121
  • 4
1
vote
1 answer

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: 10.100.71.28 Traceroute to IP works: root@pc:~#…
guettli
  • 3,591
  • 17
  • 72
  • 123
1
vote
2 answers

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 friend today and the only solution I've found is a full…
Bravo Delta
  • 140
  • 1
  • 9
1
vote
2 answers

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 *** Can't find server name for address…
CodyBugstein
  • 222
  • 1
  • 3
  • 11
1
vote
1 answer

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 access. So I'm using NAT Gateway to have static IPs…
Magno Ferreira
  • 13
  • 1
  • 3
1
vote
0 answers

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 loading times, time out messages, and other problems…
Dan
  • 111
  • 3
1
2
3 4 5 6