The IP (internet protocol) is a protocol for transmitting data over packets ("datagrams"). It is the primary protocol of the Internet. "IP" may also refer to an IP address, the numerical address assigned to an IP-capable device.

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How does the router know which device to send packets to? [duplicate]

my question does not concern how it moves through the internet, but how it moves through the router to a certain device. All devices connected to a router in a home network have the same external IP. ...
16
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12answers
32k views

Windows command that returns external IP

Is there a command by which I can find my external IP of my router or my NAT\DSL Router, etc., eliminating the need to visit whatsmyip.net or similar.
7
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5answers
13k views

Is it possible to host a web server from behind a NAT

My PC is behind a NAT router that has a public IP address. If I want to host a website then I believe I need a domain name which I can purchase from some site which would pledge to resolve all DNS ...
311
votes
4answers
39k views

Why does pinging 192.168.072 (only 2 dots) return a response from 192.168.0.58?

I mistakenly missed the dot off of an IP address and typed in 192.168.072. To my surprise I connected to a machine at 192.168.0.58 If I ping 192.168.072 I get responses from 192.168.0.58. Why is ...
1
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1answer
464 views

how can i forward requests to my own IP address to a local IP address in my network (possibly using named)?

My setup I have a linux server running in my basement. I currently have my router looking to that server for DNS lookup, so I can use named to spoof a bunch of domain names to point to my local ...
1
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1answer
2k views

IP-to-IP Redirect

How can i redirect an IP to another IP, cause currently i have a program connecting to old IP address, sadly its hardcoded into it and its impossible to change it without violating its EULA, i want to ...
3
votes
1answer
8k views

Accessing a website via the webservers public IP from a PC within the same LAN

If two machines reside on the same LAN (a PC and a Webserver) why is it necessary to enable ‘NAT loopback’ on the router in order for the PC to access the website hosted on the webserver using the ...
1
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1answer
4k views

IP to IP redirection on Windows [duplicate]

Possible Duplicate: IP-to-IP Redirect I need a simple way to redirect an IP to another IP. If in HOSTS I could write 192.168.1.2 192.168.2.3 that would be great.
0
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1answer
496 views

Why is my IP displayed in nslookup and netstat different?

i am connected to the internet through a LAN. When I see my IP in Windows 7 when using netstat -a, my IP is 172.19..., but when I used Linux (Ubuntu), for just checking a host name by nslookup, there ...
111
votes
7answers
5k views

Why can't I email myself at: MyEmail@74.125.235.55?

I opened cmd and typed ping gmail.com. It shows me: C:\Windows\system32>ping gmail.com Pinging gmail.com [74.125.235.55] with 32 bytes of data: Reply from 74.125.235.55: bytes=32 time=6ms TTL=56 ...
9
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2answers
30k views

How do I setup a virtualbox server with a static ip?

I'm trying to get a Virtualbox instance running with a very specific networking setup. Here's what I have right now: I have a laptop running Ubuntu, hosting a Debian Virtualbox. My loptop regularly ...
10
votes
3answers
43k views

How to route only specific subnet (source ip) to a particular interface?

How to route only specific subnet (source ip) to a particular interface? OS: Linux I know I can do easily by destination IP by using something like route add 1.2.3.4/24 dev eth4 but I do not ...
24
votes
6answers
16k views

How can I own an IP address?

How can I own an IP address like I do with domains? I have done some research and it seems that you can't buy a single IP, but rather you have to purchase a range of IP addresses. Update : Important ...
10
votes
6answers
5k views

Why can a network address not be a valid host address?

So... I have studied for CCNA and such and been working with IP networking at the least the past 8 years or so. I have always seen and been told that the network address for a subnet is not a valid ...
5
votes
1answer
8k views

Problem with persistent routes and VPN connection in Windows 7

My home PC has a VPN connection to my office. The office network is firewalled, with a secure zone on 192.168.0.* and a DMZ on 10.0.0.* From outside, www.mycompany.com routes to a public IP - say ...
16
votes
5answers
2k views

What is the actual IP address of my computer

I am testing out to see whats my IP address but depending on which website I used , I get different IP address . I am using a router If i use this , My IP address is If i use this , My IP address ...
10
votes
8answers
36k views

How to get my external IP address (over NAT) from the Windows command-line?

The Windows "ipconfig" command can only show me the parameters from the Ethernet interfaces from my machine (even with the ipconfig /all argument). It can show detailed information about the ...
8
votes
2answers
26k views

How to get the real IP address of someone using a proxy?

I was researching digital goods and security when I stumbled upon this company. One of the services they provide is "Real IP". They claim to be able to get the real IP address of users even when ...
5
votes
3answers
9k views

How exactly does a proxy work?

If I want to connect to say, IP 100.100.100.100, Port 80, my computer will send a tcp packet with this adress into the wire. Now If I use a proxy server say, 200.200.200.200 Port 8080 (such kind of ...
4
votes
3answers
3k views

How do DNS servers work?

I know that a domain name is resolved by a DNS server to an IP address, which is then used to reach the requested server. I'm slightly embarrassed that I don't know some of the details of how this ...
7
votes
1answer
591 views

* * * in traceroute

If I traceroute to my server via a bunch of different methods, the external ip seems to not work. However the server is online and accessible by this ip. Localhost: michaelxu@michaelxu-server:~$ ...
6
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2answers
5k views

What is the “Alternate Configuration” tab in TCP/IP settings

As I know there is two choice for configuring a computer IP address in the network. Assigning a Static IP or obtaining a dynamic IP from a DHCP server. But what is the Alternate Configuration in ...
5
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1answer
1k views

What does “network” mean in the /etc/network/interfaces file?

In Linux, to define aliases, we have to modify /etc/network/interfaces.. Something like this: auto eth0:1 iface eth0:1 inet static address 192.168.1.60 netmask 255.255.255.0 network x.x.x.x ...
4
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1answer
2k views

How to append netsh firewall rules, not just replace

I am using a script to set firewall rules in netsh. netsh.exe advfirewall firewall set rule name="Block External IP's" new remoteip="$($ipArray[0])" I thought that set was used so that it would ...
3
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3answers
3k views

Find all past desktop IP addresses

Is there a way to find some type of log file that saves all IP address that were assigned to a desktop? I changed an static IP of a desktop (switched it to DHCP) of mine and i can not recall what the ...
2
votes
7answers
21k views

How to get LAN ip to a variable in a Windows batch file

I'm streaming audio from my Windows 7 laptop to a sound card attached to a router. I have a little batch script to start streaming. REM Kill any instances of vlc taskkill /im vlc.exe "c:\Program ...
1
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3answers
3k views

Why do I have different IP addresses on different websites?

My wireless router shows the IP address is 113.46.75.*, which some websites like ip138.com, www.ip.cn show as my IP. But other websites, like googling for "what is my ip", www.whatismyip.com, ...
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6answers
25k views

How to view as another country IP address? [duplicate]

I need to view the Google music, but that is restricted in our country. Can I access it using any other fake IP address or how to view that?
-1
votes
1answer
1k views

How to override Windows 8 Hostname (computer name) with different IP address?

I want resolve Windows' hostname (computer name) to another IP. 127.0.0.1 myhostname in hosts file doesn't work. ping myhostname shows that it have ethernet adapter IP (192.168.1.2). It works in ...
1
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1answer
973 views

TCP/UDP ports that cannot be bound (permission error), but don't show up in netstat

When attempting to listen on certain TCP or UDP ports, I get weird error messages regarding permissions (or generic messages, depending on the program used to bind). The message in German is "Der ...
1
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0answers
515 views

How to redirect a URL to a certain IP, as with /etc/hosts?

Someone on my shared server has messed with some setting such that gethostbyname('www.google.com') (PHP) gives me the IP for his website, rather than Google. I believe this can be done via the ...
1
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2answers
894 views

DHCP Lease time

I have computer connected to internet directly. But once every hour IP changes and I do not want that for sure. How can I set IP lease time for like a year or so? Thank you
1
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5answers
319 views

A Virtual Dedicated IP for HTTP Requests?

The issue: An online webadmin I use requires me to give them my IP before I can use their site. They add the IP to their "allowed" list and I can then login. I just moved to a new apartment where a ...
0
votes
2answers
86 views

Linux: Any distro-independent way to change and persist IP settings?

Are there any distribution-independent mechanisms for tasks like assigning static IP addresses, adding or deleting routes, etc and, then, also be able to persist the changes so made? AFAIK, each ...
0
votes
2answers
925 views

Discover the public ip of a network without being connected

Let say, I'm next to a network and can see the traffic (with airodump or similar tool) but can not decipher it (because I am not connected on the network). Is it possible to discover the public ip ...
0
votes
1answer
140 views

Networking on a PC, want to send data from one interface to another over the network

If i have two network interface cars on my pc, like a wireless and LAN and i want to send data from wireless to LAN over the network, then tell me how can i do it. I think i have to do something ...
0
votes
4answers
3k views

Know exact location of IP address

I am trying to find locations of some IP addresses. I am using http://www.geobytes.com/IpLocator.htm?GetLocation but it seems not returning exact information. I am from Egypt, and whatever I search ...
649
votes
3answers
129k views

Transatlantic ping faster than sending a pixel to the screen?

John Carmack tweeted, I can send an IP packet to Europe faster than I can send a pixel to the screen. How f’d up is that? And if this weren’t John Carmack, I’d file it under “the interwebs being ...
16
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5answers
8k views

Ethernet vs TCP vs IP?

What is the difference between Ethernet, TCP, and IP in simple (simple abstract) terms? Please do not copy from Wikipedia...
14
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7answers
15k views

Is it possible for many domain names to share one IP address?

Is it possible for many domain names to share one IP address? For example, www.xjtl.com, www.fmie.com, sdmfl.com, etc. Hundreds of domain names share just one IP – when you do a DNS query for each of ...
36
votes
7answers
20k views

Do two computers connected on the same Wi-Fi have the same IP address?

Do two computers connected on the same Wi-Fi have the same IP address (for example, my dad's computer and my computer, at home)? If so, how does the outside world distinguishes one computer with the ...
6
votes
5answers
9k views

How do IP answer packets reach their destination inside of a private LAN?

This is a little theory question that has been confusing me for a pretty long time. Basically, if we are inside of a private LAN, and we want incoming packets to reach, for example, an HTTP server ...
16
votes
6answers
51k views

Find an unknown static IP + subnet mask of device?

I have a device set with a static IP and subnet mask. I do not know the IP or subnet mask. How can I find the devices IP and subnet mask? It is a piece of hardware, not a PC. It will not take an IP ...
9
votes
4answers
828 views

Can I rely on my own DNS server in case of a global DNS blackout?

On March 31st 2012, Anonymous plan to take down the 13 root DNS servers that power the Internet: http://pastebin.com/NKbnh8q8 ... and I don't want to even notice if it actually happens. Assuming ...
9
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5answers
62k views

How to tell what MTU is being used in Windows XP

I'm suffering from a really weird problem where I randomly get "The connection to the server was reset" errors when trying to access web pages (HTTP error 12031 according to the Windows network ...
7
votes
2answers
10k views

How does circumventing IP restrictions through DNS work in the case of hulu.com?

I just heard from an australian guy that it is possible to watch hulu.com from Australia (which is actually restricted by country IP checks) by using certain DNS servers. Now I was wondering, how ...
20
votes
2answers
6k views

ip versus ifconfig

After reading this answer, I began my quest for the difference between ip and ifconfig for *nix systems. I soon learned that ip had "more" features than ifconfig, but what's the real difference? Is ...
8
votes
2answers
1k views

Cannot access pear.php.net from OSX Lion

I am stumped by this issue. I have 2 separate Macs that cannot access pear.php.net at all by name or IP. Here are the symptoms and steps that I took to try to resolve/narrow down this issue. $ ping ...
8
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2answers
554 views

What do the various IP addresses mean?

When I visit a website (e.g. whatismyip.com) it states that my IP address is 13.151.xxx.xxx. However, when I run ipconfig, my IP address is 192.168.0.xx for IPv4 and my DNS adress is 202.xx.xxx.xx. ...
6
votes
2answers
2k views

If you visit a website they will know your IP address. But what about when you change broadband connection?

If you visited a website, of course they will know your IP address, right? But what about when you change your broadband connection? Will they still know that it is still from the same source or ...