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Questions tagged [traceroute]

89 questions
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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 the source port? How do I specify the…
StephenC
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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 ... telnet: Unable to connect to remote host: No route to…
Supasate
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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 causing the issue? More details: Client: Macbook…
Carel
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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 to use MTR to do so. Unfortunately I don't think…
akaphenom
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What does !A meaning while doing traceroute?

When traceroute to a host IP, it gives message as Tracing the route to 192.168.3.11 , min ttl = 1, max ttl = 30 . 1 172.16.11.210 16 ms 0 ms 16 ms 2 * * * 3 192.168.30.1 !A * !A What does !A mean ?
Shyamkkhadka
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Perform traceroute with specific outgoing IP

My server has multiple /24 subnets added via network-script files ifcfg-eth0-range0 Now one /24 subnet has connection issues and I need to perform a traceroute to see what's wrong. How can I have my server using one of those IPs as outgoing IP…
maddo7
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Tracert not resolving IP

I know this is propably a basic question, i did some research on the net as to the whys and hows and got only more confused. I wanted to ask why tracert returns this : Tracing route to youtube.com [2a00:1450:4007:806::1000] over a maximum of 30…
onlyf
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Why am I getting different results from two servers that located in the same destination network?

There's two servers with the same network IP, and the only difference between them is the last two numbers like: 37.211.15.247 and 37.211.166.178. The Hosting Provider claims that the subnet mask for both networks is 255.254.0.0 When I try the…
John Hark
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Possible route, but denied?

If ISP (A) can be routed to ISP (B), and ISP (B) can be routed to ISP (C) and vice versa, then why ISP (A) and ISP (C) can't be routed through ISP (B) to each other? The packets are routed like this from ISP (A) to ISP (C): A---D---E---F---C (it…
Semphie94
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Arvixe claims that my physical host is located in Europe eventhough the whois information

When I look whois of the site it seems like located in US. My site is: www.evdore.com. 1 * * * 2 hos-tr1.juniper1.rz13.hetzner.de 213.239.224.1 de 0.145 ms hos-tr4.juniper2.rz13.hetzner.de 213.239.224.97 de 0.277 ms …
Ertugrul
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iptables - Cannot traceroute from container behind NAT if SMTP port forwarding set in host

I've created a fairly simple port forwarding rule to redirect requests to port 25 to a specific container in the virtual environment: iptables -t nat -A PREROUTING -p tcp --dport 25 -j DNAT --to 10.10.10.4 The forwarding appears to be working. When…
manchine
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traceroute for HTTP

I'm trying to track down an elusive issue where a particular URL refuses to work. My investigations so far suggests there's some kind of DPI firewall/proxy/whatever between the client and server that looks at the path of the request and refuses…
janneb
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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, he gets output like: ip-192-168-1-1…
lebolo
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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 there is are very good network speeds. I am concerned about the…
Ivan
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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 exactly where the incoming traffic on said port with…
sol
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