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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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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Need to understand how assigning addresses work in following problem [duplicate]

I am posting here because even after going to professor and TA I am unable to grasp the following problem from the book. I don't grasp how to addresses are being assigned. For the A part it makes ...
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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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what is happening when a host receives a datagram with its MAC address as a destination but different destination IP

In a specific network say the host receives this datagram what is happening ?
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Why does my enterprise issue me a public IP address instead of just a private IP address?

Let's say I work for a big enterprise organization. When looking at my IP address, I notice that it is not a private IP address but is instead a public IP address. What are the benefits of ...
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network question [duplicate]

can someone please explain this question and answer Based on networks 10.8.16.0/22 and 10.8.31.0/21, which of the following is the BEST summarized CIDR notation? A. 10.8.0.0/16 B. 10.8.0.0/19 C. 10.8....
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How does the ARP table know to update if two hosts flop IP addreses?

When hosts on the same local network communicate, they manage their own ARP tables which translate between IP addresses and MAC addresses. Thus when computer A needs to send data to IP address ...
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Cisco Router on a Stick IP Addressing

I have been running into IP addressing problems with my Packet Tracer network and VLAN assingments. I have 2 switches connected to a router, 1 switch has 4 VLAN's and the other has 3 VLAN's I can't ...
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Understanding IPV4 address range [duplicate]

I do have basic understanding of IP Address which is unique address for each System either in an organization or over the internet. But i want to understand what is IP address range Lets Say we have ...
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Does Anycast allow any low-level destination control?

As an experiment, I'd like to get responses from a few different 8.8.8.8 servers (per anycast, multiple physical machines are grouped as one IP address, and I believe inspection of the request/...
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Are all packets addressed with the MAC address of the router as they leave the machine?

In the Comptia Network+ All in One, it is said that most home routers have a switch built into them. It is also said that the first thing the router does is strip off any layer two information present ...
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Juniper MX: NTP broadcast on two VRFs with the same addressing

In Juniper, NTP broadcast is set at system level, so two VRFs cannot use the same addressing and use NTP broadcast at the same time. Is there any alternative?
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How to access Cisco 2500 series admin GUI interface with known IP address when Firefox/Chrome state connection cannot be reached?

I know the username and password of my Cisco 2500 series wireless & ethernet controller and its IP address, but when I enter the IP address into a web browser (Firefox and Chrome) it states the ...
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different network mask and subnet mask and netmask [duplicate]

1- what is network mask? 2- what is subnet mask? is there any differnt between network mask and subnet mask? i'm tried to search about network mask and nothing found is it called netmask ? thank you
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32 bits or 30 bits for subnet mask

I'm new to networking and have a question about subnet masks. Imagine we have a class B IP address. I know how to calculate the subnet mask. My question is: What is the last subnet mask that we can ...
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Why is an IPv6 interface required to have a link-local address?

According to Link-local address on Wikipedia: In IPv4, link-local addresses are normally only used when no external, stateful mechanism of address configuration exists, such as the Dynamic Host ...
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Possible typo in Tanenbaum's book about NAPT

From what I have understood from multiple sources (web and other books) about the concept of NAPT (also called NAT overload or IP masquerading in Linux environment), if there is a scenario like the ...
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Extra IPv6 Addresses - where are they coming from? [closed]

I recently got assigned a block of IPv6 addresses by my ISP. I've set it up with prefix delegation and it works just fine. When I plug a NIC in on the network it quickly picks up an IPv4 address from ...
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what were the classless routing protocols used with VLSM when it was first introduced?

Since VSLM is supported only by classless routing protocols, if VSLM was introduced in 1987(RFC 1009) and all classless protocol(RIPv2 developed in 1993 , OSPF standardized in 1989 RFC 1131 ) cited ...
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IPs that cannot be used

I'm new to networking. I know that some IPs cannot be used and we cannot consider them when dedicating an IP. I know some of them such as: Net ID Addresses Loopback IP Addresses Broadcast IP ...
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Hi! What does it mean if at the same time, two external IP addresses are identical except the last set of numbers, like 123.1.12.16 and 123.1.12.213? [duplicate]

The IP addresses are of two users that are logged in at the same website at the same time. Does this mean the users are on different routers but at the same location or on the same intranet?
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Unable to use a specific IP for an IP Camera attached to a Cisco 2960 static access port

I initially had issues with an Axis IP camera not staying online. I replaced with new camera. The new camera works perfectly fine. However, I cannot access it via HTTP or ping from a specific server ...
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Modify the IP in TCP/IP packet

My ip address is specified in the ip packet sent to the next node. I wonder if a device that handles this packet can modify the ip address before forwarding it to the final destination? In theory ...
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What happens if the localhost does not interpret 127.0.0.1 as the loopback address?

For the sake of the example, assume gateway to be 10.0.0.1 and host A (my machine) to be 10.0.0.2. If gateway (10.0.0.1) is running a service bound to a port on localhost only, the service should be ...
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What Does a Private IPV6 address look Like?

I'm doing a presentation on how the internet works, and I'm wondering if there is even such a thing as a private IPV6 address. If so, what does a private IPV6 address looks like?
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What is the last usable address in an IPv6 network

IPv6 does not have broadcast, so is the last address usable? Besides it being long, is it bad practice to actually use it? For example: A:B:C:D::0/64 starts with A:B:C:D:0000:0000:0000:0000 and ends ...
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Simplest way to achieve single IP communication with IP camera and simple MCU?

I have a product that uses an IP camera and a simple ATmega-based motherboard for general I/O control, managing a very simple web interface, etc. Ideally, I would like to be able to access both of ...
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Additional subnets in a class C IP [duplicate]

If i'm designing a new subnet mask for a class C IP that will have 5 subnets that means I need to borrow 3 digits since 2^3-2 > 5. My question is, how many additional subnets do we have? would it be ...
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What's so special about the multicast address range?

I'm reading a little on IP multicast and have trouble understanding the significance of multicast address range (224.0.0.0 - 239.255.255.255). What makes this range significant? Why not multicast on ...
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Determine the range of IP's avaliable for hosts on a subnet /28 [duplicate]

I am looking into my Virtual Switch configuration( Hyper-V ) and i am confused how the range of valid IP's is determined. The IP for configured for the "Virtual Switch" adapter is: IP: 192.168.53.65 ...
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IPv6 SLAAC and Static DAD

I started learning about IPv6 and I wonder what happens when you mix SLAAC and static addresses in the same /64. My current understanding is as follows: Machine A with a statically configured ...
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Why WHOIS query get one IP in multi AS?

I am query WHOIS information: but I find two AS number of the IP: % Information related to \'47.104.0.0/13AS37963\' route: 47.104.0.0/13 descr: Hangzhou Alibaba Advertising Co.,Ltd. country: CN ...
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Are network IP addresses ever used as source or destination IPs? [duplicate]

The first IP address of an IP subnet is the network address, which stands for the whole network, while the last address is the broadcast address. As far as I understand, we never really send packets ...

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