traceroute is a CLI networking tool which determines the layer 3 path which packets take to a specified destination. It does this by sending packets with incrementing TTLs starting from 1, which trigger ICMP time exceeded responses from the routers along the path.

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How to enable traceroute in linux machine

I'm working on something in the transport layer and after i ran our custom policies for securing the policies i'm not able to do traceroute from the linux machine. root@keystone-evm:~# iptables ...
4
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1answer
4k views

linux: traceroute send operation not permitted for remote server

When I try to traceroute to a remote ip, I get send: Operation not permitted When I stop iptables, traceroute works fine. So, I assume I need some ip rule for send. What would that rule be? I did ...
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0answers
47 views

Windows 7 CMD tracert gives totally different final IP to online traceroute

So, i'm pretty damn rusty with this stuff, and been up all night for client emergency, so excuse me if i'm typing gibberish and didn't find related search results./ I'm suddenly taking over a clients ...
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0answers
33 views

Measuring latency with switch and identifying flow path

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
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0answers
28 views

Troubleshoot packet loss and slow transfers on some sites

I need some help troubleshooting a network problem. Home ISP says its the server's network to blame, and host says there's problem on ISP side. With little knowledge, its hard to see where the problem ...
2
votes
1answer
37 views

TCP traceroute works fine but not UDP

So I ran into this issue where doing traceroute some-server.abc.com returned *** for multiple lines and finally reached maximum hops limit. Doing a traceroute -T some-server.abc.com works perfectly ...
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0answers
46 views

Can only ping certain IP's over VPN

I have 2 Draytek Vigor 2830's set up with a IPSec VPN between the two which is working. Yet I can only ping the router in HQ (10.0.0.9) & the IPCortex (10.0.0.2), the outline below might help. ...
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2answers
109 views

Debugging slow transfer rate from server

I'm trying to explain this as simple but documented as possible. This is not exclusive to this server or my current ISP. I've seen the same exact issue over the years while being with different ISPs ...
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1answer
86 views

What does !A mean in traceroute?

Store_85000#traceroute 4.2.2.2 source vlan 1 Type escape sequence to abort. Tracing the route to b.resolvers.Level3.net (4.2.2.2) VRF info: (vrf in name/id, vrf out name/id) 1 10.32.5.57 76 msec 68 ...
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1answer
10k views

What does “!Z” and “!X” mean in a traceroute?

When you see "!Z" or "!X" in a traceroute, what does that mean? Where is it coming from, and how do I fix it?
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33 views

Connectivity issue when computer is on certain ip range

I am using mobile USB stick for internet connectivity. My connection works just fine, but I cannot access my computer from outside (internet) when I am on certain IP range. When my mobile stick gets ...
0
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1answer
17 views

How to specify packets in traceroute? [closed]

I reading the manual pages for help, but I didn't find a parameter that allows you to specify how many packets to send with the program? Would appreciate tips from you guys, thanks!
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1answer
53 views

Trace route to specific page on a website [closed]

If I can access a site (ie: serverfault.com) through my proxy/firewall, it means that it will allow all it's subdirectories (serverfault.com//)? I can access the website site.com/ but it returns me ...
1
vote
0answers
15 views

Connection problema to specific IP

Sometimes, like twice a year a have problems of connectivity from my server to an api server. And only to that api server. Other third party services we use were working fine. I am not so good on the ...
8
votes
3answers
5k views

Is it possible to include switches in traceroute hops?

I was wondering if it's at all possible to make a Dell Powerconnect 2848 switch show when running internal traceroutes. This would help with diagnosing issues and make it far easier to see where ...
2
votes
2answers
132 views

Packets returning but traceroute fails

I get this output from traceroute: #traceroute -i eth1 -s 192.168.12.14 192.168.1.72 1 192.168.12.1 (192.168.12.1) 1.410 ms 2.076 ms 2.251 ms 2 * * * 3 * * * etc.. But in another terminal I ...
1
vote
1answer
657 views

Yum fails with [Errno 4] IOError: <urlopen error (111, 'Connection refused')> but TCP traceroute works

When I try to connect to yum repos using either yum info or yum install I get the error: [Errno 4] IOError: <urlopen error (111, 'Connection refused')> I first thought our Firewall may be to ...
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1answer
75 views

Reading tracert output - what does this address mean?

7 7 ms 2 ms 3 ms 83.149.18.148 8 * 78 ms * ae52.edge7.Frankfurt1.Level3.net [195.16.162.53] 9 * * * Request timed out. 10 80 ms 80 ...
5
votes
4answers
904 views

why mtr is much faster than traceroute?

In the mtr man pages, it reads: mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool I use mtr a lot, and find that it's way much faster than ...
2
votes
2answers
164 views

Why there are always 10% of loss when testing with mtr command?

For example, if I run this command against example.com, with mtr command, I always get 10% of loss, no matter how many time I run, why exactly is 10%? mtr --report 192.0.43.10 HOST: localhost Loss% ...
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0answers
283 views

Suddenly cannot reach (ping) remote server on a remote site

We have 2 sites linked together with VPN tunnel (Fortigate 60C devices). On each site I have ESXi server with a couple of VMs. Normally, everything works fine. Site 1 (S1) subnet is ...
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0answers
31 views

What would cause a lack of access to wi.gov domains?

Problem I work in a technical capacity at my job and we recently noticed that we can no longer access wi.gov domains from our network. One of our clients working for the state of WI (inside a wi.gov ...
0
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0answers
49 views

Trace Route, Slow Pings, timeouts on after server restore

I am getting bad ping times on my server, especially for large data requests. The stored procedure on the server runs at 1 second, while calling it through my web applicaiton takes 23+ seconds. This ...
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vote
1answer
83 views

server unable to find route to api.twitter.com

5 minutes ago, my server was unable to find route to api.twitter.com. mtr showed a blank screen. /etc/init.d/networking restart fixed the problem but I would like to understand what went wrong so that ...
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0answers
72 views

Static Route Issue Between 192.168.0.0 and 192.168.2.0 [closed]

This is probably an easy one, but I can't figure it out! I have created a static route from my WIFI network (192.168.0.0) to my wired local network (192.168.2.0) on a Draytek modem. When I try to ...
0
votes
1answer
67 views

Traceroute to single IP from 2 different networks (one pass, another - fails)

traceroute from 2 different environments is giving different results. One is passed succesfully, the other one failed. I don't believe that would be our own switch/router - otherwise I would not be ...
1
vote
1answer
72 views

How did we manage to block connections to our VPS?

For the last week we've been struggling to get connected from inside our network to a VPS where we host some files for users of our product. It's up for everyone else, down for us and not blocked by ...
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0answers
91 views

aws high latency in same VPC Zone

We are facing the connectivity latency issues between the instances. I have calculated the connection time between the two instances in the same VPC using the command time trace-route. Sometime the ...
5
votes
4answers
3k views

Can I find the web hosting company from an IP address?

If I have an IP address, is there a way to find the web hosting service that this IP address belongs to? I tried using whois and traceroute but no luck so far. The case is that my friend bought a ...
2
votes
1answer
61 views

Network debugging port 25 timeout on dedicated server

I have hosta and hostb, two dedicated server in the same area (same bay?). Ping and communication towards these hosts are okay. But hosta seems to have all its outgoing communications on port 25 ...
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votes
2answers
142 views

Traceroute: different results [closed]

I was testing traceroute between two servers (single hop only) and I wonder why subsequent run shows different results? (1) # traceroute to 172.22.10.12 (172.22.10.12), 30 hops max, 60 byte packets ...
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votes
2answers
470 views

Traceroute doesn't reach gateway

i have problem with my opensuse 11.3 network. So, i've assigned ip 192.168.137.2 to it, and another computer (win7) with ip 192.168.137.1 On the opensuse, the gateway is the 192.168.137.1. and the ...
0
votes
1answer
69 views

tracert.exe: Why doesn't RTT increase with each hop?

Internet is slow today. So, I ran tracert.exe against a nearby server (German edition of Windows XP): >tracert inka.de Routenverfolgung zu inka.de [193.197.184.1] über maximal 30 Abschnitte: ...
1
vote
1answer
65 views

Routing between many systems, no first hop

I have a main router (10.20.0.1 (lan), 10.20.201.1 (vpn server)) connected to 5 other GW via VPN. Every gateway can ping every other one, and the PC behind them. One of my router, 10.20.6.1 (lan), ...
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0answers
341 views

pinging an unknown hosts from centos resolves

I am seeing very strange behavior with servers running CentOS 6.4 x64. If I run a ping on a host which clearly doesn't exist: ➜ ~ ping sdafsadfdsadfsasdfasdoi.com PING ...
0
votes
1answer
248 views

Incoming traceroute blocked by ufw

One of my Proxmox VMs running Ubuntu 13.04 won't accept incoming trace routes while ufw is enabled. What command do give ufw to allow incoming traceroute(6)s? The following shows up in the syslog ...
0
votes
1answer
182 views

Why my 2nd ip from traceroute is not answering the ping anymore? [closed]

My Internet is really laggy today, I did a tracerout and I realize that I'm having no answer from an ip at the beginning of the traceroute. see: Tracing route to 12.129.202.154 over a maximum of 30 ...
2
votes
2answers
2k views

Traceroute, ICMP, UDP and TCP

When does traceroute use TCP? Or does it just use UDP, also why does Traceroute use UDP on MacX and ICMP on windows? I thought ICMP just contains a message saying what caused the error of a packet and ...
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1answer
344 views

Some clients on a VPN network are not reachable

The problem of this model is that some (only some) clients cannot be reached. See the link below for more information about the model which is being described in the upcoming section. Problem ...
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0answers
31 views

Latency on intermediate network

For the past week I have noticed that most of the times pages running on my server are very slow. Sometimes they load quickly, but only about 15% of the time. Using an online traceroute tool I have ...
2
votes
2answers
475 views

How does mtr work / interpreting pain points using mtr

I have been recently trying out mtr to get network congestion pain points. Following are sample mtr requests Example1 $ mtr --report -c 10 my.url.com HOST: ansh0l-Lenovo Loss% Snt ...
0
votes
1answer
109 views

Traceroute times out for all hops after 24th, up to 70th

I'm running traceroute from my PC and from a few sources in the US to www.hku.hk for a homework assignment. Here's the output from my PC for 30 hops: Tracing route to www.hku.hk [147.8.2.58] over a ...
0
votes
1answer
236 views

ICMP echo-reply packets with a much lower TTL (-190) than ICMP time-exceeded packets

When I ping the last three hops of a traceroute path to facebook.com from my location, the ICMP echo-reply packets I get back all have a TTL of respectively 58, 57 and 56. The hops in question are the ...
0
votes
1answer
413 views

Is there a traceroute command for VXWorks? Specifically a Shoretel Phone?

I can't seem to find if there is a traceroute command for VXworks online or specifically with a Shoretel phone. Once I telnet into the phone, I would like the ability to see whether packets from my ...
2
votes
1answer
4k views

Can ping but cannot traceroute from Linux. Can do both from Windows. What gives?

So here's the issue. I have two different computers behind the same network. Both have the same gateway, IP address prefixes, etc. Computer 1: Windows XP IP 192.168.0.15 This computer can ping and ...
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0answers
112 views

New network and tracert says first hop is the host I am tracing?

Disclaimer: I am a n00b with setting up windows networks with AD. Another intermediate guy set this up. So if I do tracert google.com, the first hop sows as the IP of google.com. I have never come ...
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vote
1answer
49 views

If a request times out on an intermediate device, how are packets able to travel to the next device?

I noticed in many traceroutes that when * * * Request timed out appears somewhere in the middle hop, the packets are able to make it to the subsequent device. 3 13 ms 8 ms ...
3
votes
1answer
428 views

Linux “traceroute -A” (AS path lookup) equivalent for Win XP?

Can anyone recommend a Win XP command-line traceroute implementation providing a function equivalent to the Linux "traceroute -A" option, which includes in its output the BGP AS number (Autonomous ...
0
votes
0answers
192 views

SSH won't work after associating Elastic IP on Amazon Ubuntu 12.04 32 bit micro instance

This morning my EC2 and elastic IP were working fine. All of a sudden, all hell broke loose and my EC2 won't access through my elastic IP anymore. When I did a ssh -vvv I get debug1: Connecting ...
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0answers
188 views

How to interpret traceroute with success on some routes and failing on other similar routes?

I have traceroute paths from 3 unique source hosts, to a single destination host (173.254.24.18). The final results of these three routes are including similar elements, and yet the final failing ...