Questions tagged [ip-address]

A numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.

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How does a packet know where its destination is? [duplicate]

When I connect to my friend's mobile Wi-Fi hotspot, we both have the same public IP address. Now, when I go to duck.com, how does DuckDuckGo know where to deliver the packets? I mean, I and my friend ...
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Types of ARP messages [duplicate]

I have a little misunderstanding which message type the ARP protocol supports. From this link we can see that the ARP header consists of these fields: Hardware Type–It is 1 for Ethernet. Protocol ...
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network IP packet format

i completely understand that why receiver there is 576 bytes but my question is as technology update every after one Minutes then why we can't update that limit [enter link description here][1]
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Why loop back address never cross data link layer and physical layer? [duplicate]

Suppose I have one source ip address 101.101.25.36 whose destination address is 1270.0.0.1. That means destination ip is loop back address. Whenever packet has loop back address as destination address ...
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What does it mean to “plumb” an IP address?

Plumbing an IP address means what? What are some examples of it?
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Can Public IP's ISP location be different from owner organization location?

I'm providing a service that is limited to Singapore only and I've region-blocked any other regions, including USA. Today a customer from Singapore informed me that he cannot access to my server. He ...
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If person A has a network 123.123.123 and person B has a network 123.123, what happens if they both assign an IP to a device of 123.123.123.123?

This is something I'm confused about...if person A and B have networks with different subnet masks, then what prevents them from assigning an end IP that is identical? It makes me think I'm ...
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How to tell if an ipv4 address is public or private?

I've read the below thing, in a website. According to standards set forth in Internet Engineering Task Force (IETF) document RFC-1918 , the following IPv4 address ranges are reserved by the IANA for ...
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Why UDP checksum is optional for IPv4?

We know that IPv4 header has checksum for header not for data .Therefore for checking data error we need checksum in transport layer. Suppose we're using UDP in layer 4. So if I remove the checksum ...
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Is it possible for TCP can accept out of order segments?

TCP is connection-oriented protocol whereas IP isn't connection-oriented protocol. Any packets before sending into transport layer sorted operation must have been done in network layer. That's why we ...
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Why can IPv4 and IPv6 use strict source routing(in options field) and flow label respectively inspite of connectionless protocol?

In IPv4 option field one field option is source routing option this means packet will always be routed by router Or not. Packet can also be routed by source such routing is known as source routing. ...
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How is IP address assigned to physical location

I was thinking about buying IP addresses so i could setup small hosting company. I know that i can rent IP addresses aswell. I have alot of knowledge about networking in common but i don't understand ...
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Class D network for multicasting between group

We know Multicasting is defined as a single source sending to multiple recipients on a network when the receiver broadcasts a signal for acceptance. Multicasting has its own Class D IP addressing ...
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IPv6 addresses plan and allocation

I read at several places that ISPs should allocate a /48 (or /56) IPv6 addresses blocks to end users Wikipedia for instance The RIRs assign smaller blocks to local Internet registries that ...
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Do any subnets "Network ID" AKA "Network Address" always have an even number as the last octet? [duplicate]

Should a subnet have a "Network ID" AKA "Network Address" (eg: the first address, which is always unusable, and is the boundary between the previous subnet and the current subnet) ...
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What IP addresses are appropriate for a network inside an embedded device? [closed]

I am making an embedded device with two processors, a "gateway" processor which is connected to external ethernet, and a "webServer" processor, which is only connected to the ...
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Question about ARP requests

When a device tries to associate an IP address with a MAC address for a given device, it sends ARP requests to all devices connected to the same network. If I understand correctly, the searching ...
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Addresses in router's subinterfaces overlapping [duplicate]

I can't really understand why I'm getting overlapping addresses in subnets when they're between the allowed range. I have the network 192.168.1.0/24, and I have to create 3 subnets: A - 58 Hosts B - ...
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How does a device on one network connect to with a device on another network

So if i have two routers and each router has lets say 2-3 computer devices.I am connected to the 1st router. So if i want to connect from my device to a device on the 2nd router than I will send the ...
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Private IP address vs Local IP address

Say a router is connected to two devices. Now the router will give those two devices different private IP addresses. The router itself has a private IP address (which serves as the default gateway for ...
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how does a host learn about other hosts IP addresses connected on the same subnet? [duplicate]

My question is similar to one posted [here][1] But answers are not understandable to me. How can a host (say my laptop) learn about IP addresses of other devices (say my phone) on the same subnet. ...
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What are the negative impacts of using non RFC1918 addresses on a private network?

I work for a company overseeing network design of a large industrial system. For our purposes, it's a backbone network that other stakeholders have their own L3VPNs defined on. It is a network with ...
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Assigning static IP address from the DHCP pool range on Cisco 800 series

What happens if I assign a static IP address to a device in a LAN where there is an active DHCP server and the address falls within the configured DHCP pool and DHCP server is Cisco 800 Series? Most ...
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What does IP address assignment actually mean?

I don't understand when it said organization like IANA 'assign' block of IP address to RIRs. I mean did they just write this block belong to this RIR, this other block belong to that RIR, etc... and ...
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ARP isn't showing all the interfaces/MAC bindings

I'm playing with Dot1x port authentication, the interface G2/0/2 is connected to a PC and is authenticated/authorized successfully: SW1-2960#show authentication sessions int g2/0/2 det ...
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What're the relations between 127.0.0.0/8 and 127.0.0.1? [duplicate]

What're the relations between 127.0.0.0/8 and 127.0.0.1? As per this post, it seems that they are the same thing. I am a newbie at the network, could somebody shed some light on this question? ADDED: ...
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Fail-Safe Network With 2nd Switch?

Is it possible to set up the same VLANs on two different switches with same IPs, but different MACs on dual port network cards? In case switch 1 is down or needs maintenance I would like switch 2 to ...
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What is the difference in reliability of sending a pure ACK packet (without any data), as opposed to a data packet in TCP?

I was going through the book TCP/IP Illustrated and in the zero windows section, I noticed the use of a TCP persist timer - which is used to avoid losing a window update message from a receiver after ...
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can LAN port have multiple IP addresses of same subnet mask or different subnet mask

Can the router's ethernet interface have multiple IP's of the same subnet or different subnet mask? If yes what's the use?
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subnetting to give 4 2000 adresses [duplicate]

A large number of consecutive IP addresses are available starting at 198.16.0.0/19. Suppose that four organizations, A, B, C, and D, request 2000, 2000, 2000, and 2000 addresses, respectively, and in ...
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Can two hosts with different subnets connected with a switch talk if they know each other's MAC address? [duplicate]

EDIT: There is a seemingly similar question already, but it doesn't explore what happens if you don't need to do an ARP request at all, which is what seems to be hindering the communication there. The ...
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Divide IPv4 network into subnets in a SPECIFIC order [duplicate]

My private addresses start at 10.10.0.0/16. I must make 2 subnets with 120 and 450 starting with the 120 one and not leaving any unnecessarily unused addresses. Let me remark, it's IMPERATIVE that the ...
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Why do we need private IP address range?

When it comes to local networks, you have the freedom to use any IP address you want for your network since it doesn't need to communicate on the internet with other devices. However, the RFC ...
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What exactly defines a LAN? [duplicate]

I'm trying to understand what exactly defines a Local Area Network as such? This is how Wikipedia defines a LAN, and that sort of how it's defined anywhere else I found: A local area network (LAN) is ...
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A question from an online subnetting quiz [duplicate]

Does anyone know the last usable host IP address for the 172.45.120.0/23 network? And an explanation of how you got the answer? It's a multiple choice question on an online subnetting quiz. I'm ...
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directed broadcast ping on overlapping subnets

I have a router with 2 hosts connected to it. R: 192.168.0.1/24 host 1: 192.168.0.9/28 host 2: 192.168.0.15/24 Host 1's directed broadcast IP is the same as host 2, so what happens if host 1 pings 192....
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Dividing Network into Subnets [duplicate]

Divide the network 172.16.0.0/22 ​​into subnets of the following size: 128, 300, 40, 20, 20. How exactly is this done?
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Why can't I access Whitehouse.Gov with the IP address or the Aliases? [closed]

I'm studying the basics of networking at the moment, and I was testing out what I had learned when I discovered that I could not access WhiteHouse.gov via the IP address. After using dig on WhiteHouse....
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What is the maximum number of networks in IPv4?

From my understanding, in IPv4 addressing, the first 2 octets identify the network, meaning 2^16 networks can exist. But that doesn't seem even closly enough as the population in even USA is above 300 ...
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Basic conceptual questions about network interfaces

I have some basic questions as I am trying to understand the concept of network interfaces a bit better. Is network interface same as network interface card (NIC)? If not, what's the difference. What ...
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Why did we not run out of IPv4 adresses yet? [duplicate]

I know how IP addresses work and I also understand the reasons why there is a natural limit to those addresses, as well as the solution to that problem. Officially, we have ran out of IPv4 addresses ...
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Why does this ip address give me an error "must be valid ipv4 cidr"?

If I set up an AWS VPC with CIDR of 10.0.0.0/20 then the range is 10.0.0.0 to 10.0.15.255 I make a subnet now. Why does 10.0.15.15/28 give an error. Isn't it's range 10.0.15.15 to 10.0.15.30 which is ...
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Why did the IANA specifically choose these ranges for the the private IP address space? [closed]

10.0.0.0/8 IP addresses: 10.0.0.0 – 10.255.255.255 172.16.0.0/12 IP addresses: 172.16.0.0 – 172.31.255.255 192.168.0.0/16 IP addresses: 192.168.0.0 – 192.168.255.255 Is there any reason behind ...
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Confusion regarding possible IPv6 Link Local address prefixes

I have trouble understanding how many alternative link local IPv6 address prefixes may exist. I know that the prefix is fe80::/10 which implies that the first 10 bits must be static as: | 10 ...
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Error in IPv4-to-IPv6 mapping of Google IT Support Professional online course?

In part "2. The Bits and Bytes of Computer Networking" → "Week 6" → "5. IPv6" → "3. IPv6 and IPv4 Harmony" of the Google IT Support Professional Certificate ...
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Is it customary to not have any addresses in an organization available for private networks? [closed]

I encountered this setup in the wild: a campus has a big internal network. They're using IPv4s from 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 as expected. The part that surprised me is that they ...
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Why is the Internet not hierarchically addressed? [duplicate]

IANA is recognized as an authority on global IP address allocation. See Wikipedia, or ietf.org, IANAs website, or Google it. They state that "both IPv4 and IPv6 addresses are generally assigned ...
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Routing with private addresses

Let's say that we have a private network, with private addresses and a NAT enabled router at the end. If the router is misconfigured and routes traffic to the global internet, keeping as source ...
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How the device chooses between multiple DHCP pools?

In a router , you can create and configure multiple DHCP pools each one with its own default route and dns server . And because the DHCP pool configuration is not specific to an interface in a router, ...
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Is not 192.168.88.1 (192.168.*.*) always an "internal" IP address?

I had some headache with a proxy setup which I couldn't figure out. Turns out that only "127.0.0.1" and "localhost" were recognized as "localhost" or "internal" ...

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