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 do CGI scripts (application layer) know the IP address of the requester? [closed]

CGI scripts are on the application level (HTTP) so I would think that are not aware of header info from lower layers. Indeed, if you analyse the HTTP headers in Postman, there is no source port, ...
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MAC vs Local IP [duplicate]

As far as i've understood the datalink layer (level 2) of the ISO/OSI stack is responsible for local networks and it uses MAC addresses to establish connections between nodes. Also, local ip allow ...
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Do all computers on a wifi network have the same Network ID in their IP address?

I'm trying to clear something up that I haven't been able to get a simple answer to. If I have multiple computers on the same wifi network, is it correct that they will have the same network ID, but ...
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giving a network 192 addresses from an internet pool [duplicate]

I am answering a question in my networking course. It says, given an internet with a 9-bit address space (/23 subnet mask). The addresses are to be divided between 3 networks N0, N1 and N2; with 64, ...
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How is IP tramsmitted from client to server? I checked HTTP requests but its not there [closed]

how do websites know our IP? I checked in HTTP requests, headers and everything is there but no IP why so?
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Will pinging the multicast “all hosts” IP 224.0.0.1 fill my ARP cache with all hosts on my current subnet?

Just wondering in case I ever have a want / need to see all the hosts on my subnet.
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Function of the P-bit flag in an IPv6 multicast

Currently I'm trying to learn (common) things about IPv6 and started with the address format and the address scopes. Finally I reached the multicast part where my problem with the definiton of the ...
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Is the first address in an IPv6 subnet assignable?

I am working in a lab and have configured a series of /125 subnets between routers. Lets ignore the best practice for this discussion of using /64 for everything. When I assign fd00:f9a8:ffff::257 to ...
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How to get IP address of device from its MAC address on network?

Though it seems possible duplicate of this question. But the need to ask this question again is to simplify the scenario and the demands to just finding the IP address of the device. The network in ...
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Changing default gateway IP address from a failing switch to a VRRP configuration using failing switch plus two others

I have an HP 5406 switch that has been the default gateway for years. This switch is beginning to fail but still has customers Ethernet and Fiber on it. Everyone on my network, 800 or so devices all ...
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Understanding EUI-64

I was reading Forouzan's book. It says following: In IPv4 addressing, there is not a specific relation between the hostid (at the IP level) and link-layer address (at the data-link layer) because ...
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Is 10.0.0.0/24 Class A or C [duplicate]

So I'm trying to understand IP Addressing and I seem to understand but then I came across 10.0.0.0/24 as an example I got confused because I thought 10.0.0.0 is a Class A address, but if it has /24 ...
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How does NAT ensure that every machine has a unique public IP?

I am trying to understand the distinction between public and private IP addresses in IPv4 networking. The picture I've been told has some problems with it, so I would like to present it here and ask ...
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Question On Route Aggregation [duplicate]

Suppose I have these 3 IP Prefixes : 190.154.27.0/26 190.154.27.64/26 190.154.27.192/26 and I want find the aggregate prefix. I convert each address to its' binary equivalent: 10111110....
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Why the first octet of a MAC address always end with a binary 0?

I stumbled upon a piece of code on GitHub: https://github.com/adeverteuil/bash-ula-generator/blob/master/gen-ula.sh # Generate an EUI64 from the MAC address # as described in RFC 3513 # https://tools....
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Why is the IPv6 link-local address not /9?

According to this answer, it's because computers read addresses in binary. Fine. That explains why the fe80 address does not need to be /12 or /16--it's because everything after the 10th bit is a ...
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How do VLANs Work? Some Basic Questions:

I've recently started looking into VLANs. I am a network novice so bear with me please:). I have a few questions regarding VLANs. I understand that certain managed switches allow you to create VLANs. ...
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Calculate subnet id for each lan [duplicate]

Consider the following network where a router connects four subnets to the Internet. The first subnet (LAN1) must support at least 61 hosts. The second subnet (LAN2) 20 hosts. The third subnet (LAN3) ...
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Redirect request from local network to behave like a request from internet

I've setup some cameras on local IP 192.168.1.220 and the device is listening on ports 60000:60001. We use Zyxel USG20-VPN if that helps. We have a static address (for sake of example STATIC_IP). I'...
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Which packet's path is shown to us when using the trace route command? [duplicate]

When data is transferred across the internet it is split into numerous data packets of size no more than 1500 bytes and these packets reach their destination through different paths across the ...
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VLSM Subnetting [duplicate]

I was given this question to attempt but I have no idea where to even begin. I seriously can't get my head around this stuff any help is greatly appreciated. Given a global address of 172.62.0.0 /16. ...
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IP address source and destination translation without a gateway

I have a private network (no gateway) with a number of devices configured on one subnet (say A.A.A.0/24). I would like to change the IP addresses of all devices on this network to a new subnet (say B....
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Static IP assignment 3750X - DHCP Override

I have a 3750X that I am running some testing with. I have a VLAN interface that is using 10.10.10.254/21 as it's primary IP and 192.168.10.254/24 as it's secondary IP. See below: interface Vlan10 ...
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What determines the private ip addresses? [closed]

Right now, I am using internet at home, and my private ip address is 192.168.x.x. At work my private ip address is 10.x.x.x. In both of the scenarios, I did not play any role in selecting my ip, I ...
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Are these two private subnets completely isolated from each other?

Im trying to set up a subnet address range in my local network but the private address ranges of 172.16.1.1 192.168.1.1 10.1.10.1 are all already being used. So I was wondering, if I make this ...
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How to do subnetting on IPV6 for non nibble boundaries?

As I was reading this article on How to: calculating IPv6 subnets outside the nibble boundary https://blog.apnic.net/2018/08/10/how-to-calculating-ipv6-subnets-outside-the-nibble-boundary/ The author ...
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Is this possible (NAT??)

I have a device on another network, say it's IP is 10.1.1.1 I want to ping it from my own network, say host 192.168.1.1, but I want to ping an address in my local segment to do so,so 192.168.1.2. Is ...
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Getting Mulitple Source IP addressess when doing Port Monitoring

I have a Cisco 2960 switch that I'm trying to find which device IP address is connected to each port... My Setup: monitor session 1 source interface gigabitethernet 0/5 monitor session 1 destination ...
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How do I find the number of IP addresses between two given IP addresses? [duplicate]

How would I find the number of IP addresses from 224.65.0.0 to 225.127.255.255?
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How many public static ips do one need if a PC is behind a wireless router?

If a PC is connected to internet through a wireless router. How many public static ips do one got to get from the ISP. Do the router and PC both require one static IP. What if I want to add more PC ...
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Two NICs - IP address conflict between 2 networks?

I have a Windows PC with 2 NICs; one NIC connects this machine to the local LAN while the other NIC connects this machine directly to an X-ray machine (which I'll call the RayLAN). So my question is ...
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Overload PAT Question

Learning details of NAT PAT. I understand basics wherein the PAT router incorporates a source port to ID the private address computer communicating out on the public address, enabling the public ...
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How to Reset AlliedTelesis GS950 Websmart hardware

The switch described above had a management IP address configured. Unfortunately, the IP address of the switch was lost and the management cannot be accessed anymore. Is there a hardware reset on this ...
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Finding number of host and network [duplicate]

Can someone explain to me how to do this homework question. I am confused on whether it should be 1022 host or 1022 networks: I allocate 10 bits as subnet number to identify a physical network, then ...
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Varible Length Subnet Masking - Smaller subnet with two larger subnets on each side?

Background: I'm redesigning a network of virtual machines. The virtual machines are all on 10.0.2.0/24 and 10.0.3.0/29 networks, the physical network is a 172.32.255.225/28 network, which stands ...
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Shoretel ST1D Switch not accepting assigned IP

After configuring a Shortel ST1D switch, I connected the LAN1 Port from Shoretel ST1D to my Cisco 4507R switch. I attempted to ping the IP that I set specifically on the ST1D switch and I wasn't able ...
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IP block assignment [duplicate]

Let's say that an ISP manages the IP block 128.64.32.0/19, and assigns the block 128.64.32.0/22 to company A. Now, company B needs a block of IP addresses for 1234 hosts, immediately after the IP ...
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How to tell apart the type of the mask(subnet-supernet-net mask)

Say we have the the IP address 10.2.8.230/24 Anyone could say the following: It just represents a normal network:10.2.8.0/24 Or it is a subnet because normally this IP address is in the class A ...
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What does it mean when the last digits of an IP address change? [closed]

So in a case where I have an IP address, 162.158.68.xxx, what is happening when those values in xxx change? I ask because I'm looking at requests going through to my application's server and one of ...
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Addressing for a WAN, LAN and DMZ

I was wondering about the addressing for certain types of networking areas... I use 192.168.0.0 for a LAN network, 10.0.0.0 for a WAN and 172.16.0.0 for a DMZ. But I've been confused why a 10.0.0.0 ...
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Subnetting - IP Address Classes [duplicate]

I've been trying to get my head around subnetting but seems to be getting confusing with the classes and IP ranges within that class. Example: IP Decimal:10.2.225.234/22 IP Binary:00001010 00000010 ...
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How to architect a globally distributed website, from an IP address perspective

I would like to have a website that is loaded fast from any point in the world. From my understanding, you need to take advantage of the data center "regions" at places like Google Cloud or AWS. That'...
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Is it possible that two servers were configured with the same ip under the same switch

I have two physical servers, their configuration as following: ServerI: IPADDR=10.1.1.5 NETMASk=255.255.255.0 ServerII: IPADDR=10.1.1.5 (Same IP) NETMASk=255.255.0.0 (different NETMASK) Because of ...
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Wago 750-377 - assign IP address

I've just bought a 750-377 wago fieldbus coupler and I'm trying to assign an IP address to it through an ethernet cable that goes from the device to my computer. Is there any way to do that or do I ...
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Does an IP address with host part zero's represent a network, or a network interface in a network?

If the host part of a IPv4 address is all zero (e.g. 192.168.1.0 in a network with mask 255.255.255.0), does the address represent the network, or a network interface in the network? Thanks.
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What IP address can't be the source address in a packet?

I heard that the destination address in a packet can't be 0.0.0.0. Is there any IP address (including special ones) which can't be the source address in a packet? Thanks.
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What IP address can't be the destination address in a packet?

I heard that the destination address in a packet can't be 0.0.0.0. Is there other IP address which can't be the destination address in a packet? Thanks.
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Is a network interface supposed to have no more than one MAC address?

Is a network interface supposed to have no more than one MAC address? Since a network interface is free to have more than one IP addresses, is IP address a way of multiplexing MAC address, if a ...
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Do the concepts of IP address and network interface not belong to the same layer?

https://unix.stackexchange.com/a/508065/674 You are confusing the device driver layers and the IP layers of the stack. At the IP layer, 127.0.0.1 is just another IP address and treated the ...
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Does a loop back IP address not need to be assigned to a network interface, in order to communicate with? [duplicate]

ifconfig shows only one loopback address 127.0.0.1 and that it is assigned to network interface lo. ping 127.0.0.2 can receive packets back, even though 127.0.0.2 is not assigned to a (virtual) ...