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29 votes
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Is it possible to force TCP to find another path to the host?

Is it possible that the route is somehow cached? If so, is it possible to reset this cache? No, only the first hop (i.e. the route to your local gateway) is under control of the OS, but you have no ...
grawity_u1686's user avatar
6 votes

Difference between `Tracert` and `Traceroute`

They should be the same. Here is what I found: Both commands are basically the same thing. The main difference is of the Operating System and how the command is implemented in the background.On ...
breakpoint's user avatar
6 votes

Why is tracert not showing my public ip address?

Traceroute results correspond to whole routers, not their individual interfaces. Even though a router has multiple IP addresses on various interfaces, it will always produce only one trace reply. When ...
grawity_u1686's user avatar
5 votes

traceroute on same subnet not working; shows only stars

Traceroute works by sending pings with increasing Time To Lives, and watching the address the responses come from. By default the windows firewall drops inbound ping requests, so traceroute to the ...
jrtapsell's user avatar
  • 488
5 votes
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What does N * * * mean in traceroute output?

It shows that waiting for the ICMP "Time exceeded" (TTL expired) message timed out. This can happen at the end of the line, if routing was ultimately unsuccessful (perhaps the destination machine is ...
Ben Voigt's user avatar
  • 7,286
4 votes

Using nmap to traceroute on a specific port

Nmap specifically chooses probes for traceroute from what it knows about the target, choosing probes that are most likely to make it all the way to the target. For this reason, its traceroute is not ...
bonsaiviking's user avatar
  • 1,988
4 votes
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Can you ping a VOIP / Sip telephone number in the same way you can ping a domain name

Can you ping a VoIP telephone number? I'm interested in doing so, so that I can get the IP address and do a trace route. No, that is generally not possible. If the caller is using a VoIP provider ...
DavidPostill's user avatar
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4 votes
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Difference between `Tracert` and `Traceroute`

Ping command, ping [1],[2], is the basic tool that sends a package to the destination and waits for the answer. In the output it shows the delays ( min/avg/max/mdev ). You can ping different ports ...
Hastur's user avatar
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4 votes
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Why MTR prints multiple IPs as the latest node?

That's not necessarily the last node. The issue here is that once mtr gets the first set of replies, it doesn't update the number of rows anymore. The first path that was seen had 17 hops, but later ...
grawity_u1686's user avatar
4 votes
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traceroute shows just * * * in linux ( in a virtual machine ), although displays all IPs in windows correctly

The packets that Windows tracert and Linux traceroute use by default are different. Windows tracert sends ICMP packets and Linux traceroute sends UDP packets. The UDP ports are blocked at each hop in ...
n8te's user avatar
  • 7,632
4 votes

Is it normal to get some request timed out in tracert?

Yes it is quite normal. It is an indicator that the device your using does not have have enough capacity to respond, or is configured to ignore (or not respond to) pings.
helper's user avatar
  • 341
4 votes

Is it possible to force TCP to find another path to the host?

To extend the footnote in @user1686's answer: https://superuser.com/a/1760203/374853 IPv4 did have the "Source Route" ... IPv6 SRH (Segment Routing Header) allows the sender to specify a ...
Sompom's user avatar
  • 186
3 votes
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Same hop count for different destinations in traceroute

I'm going to give you my best shot at explaining this. But, I don't know why your ISP is doing it. First, it's important to understand how Traceroute works. Traceroute works by settings the TTL (Time ...
Appleoddity's user avatar
  • 11.8k
3 votes

Cant access certain websites in my ubuntu

I can't also ping from here :) But I can access the web site using a browser. That means that site is ignoring ping requests, which is usually done for security reasons (see the answers from here: ...
jp48's user avatar
  • 143
3 votes

How to remove nodes from a path?

There isn't much you can do specifically that will alter the path you follow. Routing decisions are made by the network, and are a result of peering arrangements between various network providers. ...
Paul's user avatar
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3 votes
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Is it possible avoid specific trace (nodes) in internet?

"Is it possible avoid specific trace (nodes) in internet?" Although your question is vague, I assume you basically want to know if your can control a packet of data's route through the Internet from ...
acejavelin's user avatar
  • 6,548
3 votes

How to find which DNS server I am using (of the multiple configured dns servers)

You could visit http://whatsmyresolver.stdlib.net/ The page tells you what dns server you used to resolve a domain. This has the advantage that it works even when you don't have access to your router, ...
Simon's user avatar
  • 372
3 votes

What does N * * * mean in traceroute output?

It means that the packet timed out, by default waittime is 5 seconds, and if response is not received in that time it shows asterisk, and jumps to a next hop. It could time out because that router on ...
ralz's user avatar
  • 2,528
3 votes
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10.0.0.0/8 : Routable or non-routable?

Private IP addresses are just normal addresses that we reserved for private use. They are routable just like any other unicast addresses. It's just that we don't allocate them to a single organisation ...
Sander Steffann's user avatar
3 votes
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What does the output of traceroute mean?

Traceroute shows each hop that a packet has to go through from your host to the destination host (in this case bbc.co.uk). Each one of these steps is represented in a line. The first column is the ...
jcbermu's user avatar
  • 17.6k
3 votes

What does the output of traceroute mean?

From traceroute manual: traceroute - print the route packets trace to network host traceroute tracks the route packets taken from an IP network on their way to a given host. It utilizes the ...
Zumo de Vidrio's user avatar
3 votes
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Why does traceroute shows multiple paths but mtr does not?

Actually the traceroute in modern Linux has options which match mtr behaviour (and vice versa). We can see this is a matter of defaults only. traceroute was the original. The details of the ...
sourcejedi's user avatar
  • 3,365
3 votes

why is there a delay in showing the IPs in traceroute?

The traceroute program is trying to perform a DNS lookup (so-called reverse DNS) for each address shown, so that it could show a domain name instead. However, your system's configured DNS server ...
grawity_u1686's user avatar
3 votes
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How to find out which network device is used to reach a given server

You can use route get 8.8.8.8 to find out which interface and gateway on the local computer is used according to the local routing rules. The -4 and -6 options as on BSD don't work, but the -n option ...
dirkt's user avatar
  • 17k
3 votes
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traceroute in Ubuntu

It does, right here: /usr/bin/traceroute.db There are several traceroute programs for Linux; this is "Traceroute by Dmitry Butskoy". Your own file list also shows a script /usr/bin/traceroute-nanog ...
grawity_u1686's user avatar
3 votes
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Multiple private addresses in my traceroute results

There are multiple private IP adresses in hops 3-7 Your ISP is using Carrier Grade NAT: Carrier-grade NAT (CGN), also known as large-scale NAT (LSN), is an approach to IPv4 network design in which ...
DavidPostill's user avatar
  • 158k
3 votes

Wifi Latency : modem or internet carrier?

The first thing I would check is whether the performance improves by using an ethernet cable directly into your router. That way you can rule out the connection to your property being at fault. If ...
Randomhero's user avatar
  • 1,402
3 votes
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Do Linux (4.15.0-130) and Windows (10) treat ICMP differently?

It's not the same traceroute. Linux traceroute actually sends UDP probes by default, instead of ICMP Echo as Windows would. Use sudo traceroute --icmp to get something closer to Windows. (Try out mtr ...
grawity_u1686's user avatar
2 votes
Accepted

Huge latency in the middle of a route between India and Europe

The distance from India to France is in the order of 7000km's, which means a return trip time of about 120ms just on that leg - and I imagine that, reverse DNS notwithstanding, hop 7-8 is the backhaul ...
davidgo's user avatar
  • 71.3k

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