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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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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29 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 ...
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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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45 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 ...
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13 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 ...
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2answers
112 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 ...
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94 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
374 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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63 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 ...
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29 views

Very strange ping times [duplicate]

Since yesterday I get very strange ping times. Please have a look: root@serverek:~# ping onet.pl PING onet.pl (213.180.141.140) 56(84) bytes of data. 64 bytes from sg1.any.onet.pl (213.180.141.140): ...
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843 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 ...
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30 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 ...
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44 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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1answer
78 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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66 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 ...
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57 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 ...
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1answer
68 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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77 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 ...
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1answer
56 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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2answers
131 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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1answer
62 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: ...
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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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308 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 ...
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222 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 ...
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144 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 ...
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28 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 ...
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1answer
293 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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2answers
411 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 ...
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1answer
95 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 ...
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208 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 ...
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252 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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107 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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48 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 ...
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1answer
372 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 ...
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175 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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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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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 ...
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414 views

How can tracerouting a 192.168.x.x exit the local network?

In a LAN if I traceroute the IP address of any other machine, it gets it in one hop <1 ms. However, there is one machine, which if I traceroute, it exits the private network, goes out through ...
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Sanitise input for traceroute tracepath [closed]

Hi I'm after a way to sanitise input for traceroute/tracepath /well really any bash input. For example: root@meh:~# tracepath http://google.com/ gethostbyname2: Unknown host I'll probably setup an ...
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299 views

Cannot Traceroute/ssh outside network

My server cannot connect to ANYTHING EXTERNAL via ssh. I also cannot traceroute to any of them. Machines on the same network work fine via SSH and traceroute. This machine is connected to the ...
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122 views

Why does traceroute fail?

Let's say I traceroute to address A: 24.205.224.36 Here's what the start of the traceroute looks like: $ traceroute -d 24.205.224.36 traceroute to 24.205.224.36 (24.205.224.36), 64 hops max, 52 byte ...
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1answer
380 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 ...
4
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1answer
332 views

traceroute continuing after destination?

What does it mean when traceroute continues after its destination? For example; if I was trying to traceroute 4.4.4.4 why would something like the following occur: 13 x.x.x.x (xxxx) 26.966 ms ...
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250 views

Tracking actual packet path on a LAN

Is it possible to track the path a packet takes on a switched network. When I run a traceroute I get only the router and the destination. I know for a fact, however, that the packet must pass through ...
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2answers
161 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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798 views

how does traceroute resolve router names?

I found this fun little example of traceroute being used to output Star Wars stuff. It came from http://beaglenetworks.net originally. % traceroute -m 100 -U -p 3550 obiwan.scrye.net traceroute to ...
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131 views

Putting router names in traceroute hops?

We have a number of sites that are interconnected via VPN tunnels. When troubleshooting issues I regularly find myself running traceroute to see the path the workstation takes to access a remote ...
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157 views

DNS name resolution with traceroute

i'm using my computer inside China to connect server outside country. I tried many days a traceroute command to domain.com, that has ip address 114.157.42.212 and everytime the response is like this: ...
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142 views

How to find out why website is not accessible? [closed]

I cannot access a certain website. There are two possible reasons: The block is on the ISP side. The block is at the website. Is there a technical way to figure out which of these are causing the ...
2
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2answers
2k views

How to ping / traceroute an AWS ELB

Amazon's load balancers have a network security policy which swallows ICMP packets for both ping and traceroute. It is listed as security group amazon-elb/amazon-elb-sg. Personally I find these ...