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 many /56's are there in a /49 IPv6 [duplicate]

I am studying subnetting in IPv6. I came across the following question from a website called Subnetting Practice, which I will quote below. How many /56s are there in a /49? Could someone please ...
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Simple IPv6 Global Unicast question

I was reading this article which states: RFC 3587 states that out of the 128 bits in IPv6 addresses, left most three bits are must be fixed as 001. Remaining 45 bits are reserved for global routing ...
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Why shortened version of IP4 exists and it is undocumented but supported everywhere?

For example there is an IP address 192.168.0.1 It is clear that you can use it as the full line, but try that one 192.168.1 It will also work, and it will be automatically converted to 192.168.0.1 ...
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How to look up IP addresses in a geographical location? [closed]

My goal is to find an IP address in a geographical area (a city, island or state). I know it is possible to get geolocation of an IP address, I'm trying to do the reverse. One way to do this is to ...
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Why is this 254.63.0.1, not a valid host address?

Getting the below error, when trying to configure the ip address 254.63.0.1 as an SVI. Switch(config)#interface vlan 254 Switch(config-if)#ip address 254.63.0.1 255.255.0.0 Not a valid host address -...
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Why do large companies need public address ranges? [duplicate]

For example google states they own the public address range "8.8.4.0/24". Why would they need a whole block when they could use NAT. What factors contribute to this decision? Is it that they ...
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What is difference between socket connection and TCP connection?

We know TCP socket is port numbers and IP addresses. Is TCP socket connection is 3-way handshake:the SYN packet, the SYN-ACK packet, and the ACK packet? Is TCP socket connection follows TCP stack? And ...
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Dividing network into subnets [duplicate]

My teacher uploaded this example question and solution as explanation of the topic: I watched some videos about it but none of them made it fully clear, what I don't understand here is: What are ...
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How is CIDR used in ranges?

There are times where CIDR notation isn't used to subnetting or for routing/summarization but rather just for ranging IP addresses, IPv4 mostly. It seems very non-standard and it seems to be like a ...
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Does socket address include transport protocol (http://)? [closed]

Let's say I have the following: http://ip_addr:port This is supposedly called the socket address (see sources below), but I can't find a conclusive answer anywhere if the transport protocol (http://) ...
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What are the commands to configure static routes using next-hop IP addresses?

Given the network topology above and that X in all subnets should be replaced with 1. What are the commands to configure static routes using the next-hop IP addresses on r1 and r2, given that you are ...
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What is the routing prefix (in format: address of a network/bit-length of the prefix) for the smallest subnet that contains these four hosts? [duplicate]

A computer network has hosts with the following IP addresses: 124.127.64.147 124.127.64.151 124.127.64.155 124.127.64.156 What is the routing prefix (in format: address of a network/bit-length of the ...
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Understand router Ip address and Mac address, Switch Mac address

Scenario:1 Suppose external Router R1 has interface a connected with interface b of the site Router R2. And Router R1 using IP address 80.0.0.0/8 for a. Router R2 has 4 subnets 80.0.0.0/10, 80.64.0....
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Acknowledgement, retransmission of layer2 is actually belongs to layer4?

I followed from this question understand that only transport layer responsible for acknowledgement. But I have read on book stop and wait, GBN, SR protocols uses acknowledgement, retransmission in ...
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How are IP address compared to the default 0.0.0.0/0 or ::/0 on binary level?

Let's say I have an ipv4 destination address - 63.168.52.12 In binary format the address: 00111111.10101000.00110100.00001100 The default route in binary is 00000000.00000000.00000000.00000000 I am ...
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Could we use private IP address as directed broadcast address?

We know that private IP addresses ranges of class A, class B, class C are 10.0.0.0-10.0.0.255, 172.16.0.0-172.16.255.255, 192.168.0.0-192.168.255.255 respectively. My first questions is that first and ...
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How can I test if the subnet mask and default gateway are set for a device? [closed]

I understand how subnet masks work mechanically and how to convert from the mask to the CIDR bits notation, and I understand the concept of a default gateway. What I don't understand is what setting ...
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Does an unmanaged switch deal with IP addresses at all

My belief is that an unmanaged plug-and-play layer 2 network switch only deals with MAC addresses. When computer A on a local network wants to communicate with computer B for example through the ...
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How can someone connect to my computer even through port forwarding?

If I set port forwarding up on my router to redirect connections on port, say, 50000 to my computer, how can someone connect to my router in the first place ? Does that mean that my router has a ...
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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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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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2 votes
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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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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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