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Questions tagged [ip]

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.

38 votes
5 answers
209k views

How to find my DNS Server address in Windows 7

What is the easiest way to know my current DNS server's IP address or domain name? I am trying to troubleshoot my broadband Internet connection under Windows 7.
rakib's user avatar
  • 383
37 votes
3 answers
111k views

On Windows, how to determine route for IP destination?

How can I determine the IP route taken for a specific IP destination (without looking at "route print" and figuring it out manually)? In OS X there's route get 1.2.34 and in Linux there's /sbin/ip ...
Ilya's user avatar
  • 1,814
37 votes
3 answers
14k views

Why does the registered domain name “localtest.me” resolve to 127.0.0.1?

I was reading an article about Server-Side Request Forgery. In that article the attacker found that 127.0.0.1 was open to the internet. The victim then blocked 127.0.0.1, but because many other IPs ...
not2qubit's user avatar
  • 2,375
37 votes
4 answers
154k views

What does /16,/24 mean with regards to ip addresses?

I am trying to understand how network topologies work in large scale networks such as college campuses. I often see the phrases /16,/24 with regards to ip addresses. I would like to know what /16 ...
Max's user avatar
  • 491
36 votes
5 answers
12k views

How can every single device on a network have a different public IP?

I'm at a computer camp, and I noticed that every single device connected to the network has a different public IP, which really surprised me. What is even more strange is that their public IPs are ...
Flare Cat's user avatar
  • 944
35 votes
6 answers
37k views

Add a static IP alias to a DHCP interface on Windows 8 (and above)

I have a Windows 8 machine that has only a single Ethernet port. It needs to use DHCP and also needs a static IP. Each IP is in a different subnet, and each serves a different, incompatible purpose. ...
Warren Young's user avatar
  • 3,765
33 votes
4 answers
7k views

IP address: 000 simplifies to 0?

I was setting up my Ubuntu with brother printer driver and was trying to use my printer's IP to connect my pc to the printer. On my printer, the IP address is 192.168.000.008. So I entered this in my ...
Kentaro T. Vadney's user avatar
31 votes
7 answers
31k 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 ...
Goblinlord's user avatar
31 votes
9 answers
70k 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 ...
Rohit Banga's user avatar
  • 2,464
30 votes
5 answers
32k 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...
waka's user avatar
  • 1,247
30 votes
3 answers
10k views

Why can I ping 10.0.0.0/8 addresses from a 192.168.1.0/24 subnet?

My home network uses a 192.168.1.0/24 subnet, and when I ping 192.168.1.137 I get a response saying the host is unavailable (as expected because I don't have any machines using that address) However, ...
Ryan Oliver Lanham's user avatar
30 votes
5 answers
40k views

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

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 ...
InsomniaArray's user avatar
30 votes
4 answers
17k views

Are subnets always contiguous 1s? [duplicate]

I understand the basic premise behind subnet masks, such as 255.255.255.0. But all the subnet examples I’ve seen have been (from left-to-right) contiguous 1s (HI bits). For instance, 255.255.0.0 (/16) ...
Zac's user avatar
  • 403
29 votes
2 answers
59k views

What is the difference between a subnet mask and a netmask?

Is there any logic in using two different names for determining host ID and net ID? For example, if you type print route in a Command Prompt you get things with netmask, but the IPv4 settings seems ...
Alireza's user avatar
  • 969
29 votes
2 answers
33k views

Does the order of entries in the routing table matter?

Does the routing order matter: > route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 123.x.x.151 0.0.0.0 255.255.255.255 UH ...
static's user avatar
  • 1,367

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