Questions tagged [ip]

For questions about Internet Protocol (IP), an OSI layer-3 network protocol. There are two current IP versions in use: IPv4 and IPv6.

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What handshakes happen (or need to happen) when I connect my FPGA with Ethernet cable to my home router+modem device in one of its ethernet port? [closed]

I have a FPGA edge device. I want to send and receive ethernet packets to my laptop through the router+modem device at my house. My laptop is connected to the router+modem through the wifi (for ...
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what is the meaning of TCP protocol is a connection oriented [duplicate]

I read some of Wikipedia pages about computer networks and learned how and why they evolved. about TCP and IP i learned that for reducing complexity of network, the intelligence in the network is ...
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1answer
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What does an IP Address with CIDR represent precisely?

This question is more a question of definition then a technical one: You have some network with the network identifier 172.16.0.8 and a subnet mask 255.255.255.248 (/29) We know that the usable ...
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3answers
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Routing traffic within the subnet - How to decide CIDR range?

I am following this tutorial to configure multiple subnets and firewall: https://networkfirewall.workshop.aws/setup/distributedmodel.html This tutorial shows how to filter traffic through the ...
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1answer
61 views

Identify vrf within packet capture

I have a scenario where i am capturing data where mutiple customers vrfs traverse I am looking at my capture and ofcourse i see source & destination However, these addresses could come from ...
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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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5answers
231 views

If IPv6 exists, why do we still pay for static IPv4 addresses?

Given that there is some ridiculous number of IPv6 addresses per every single person on the planet, why do ISPs still charge for IPv4 addresses? Why not just give the user an IPv6 address? Is it ...
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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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1answer
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What defines a device as connected to the Internet? [closed]

I recently saw a SO question: Are there global networks other than the Internet? I am aware of other networks such as ATM and the telephone network, which are not part of the Internet. My question is, ...
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1answer
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Why in the TCP/IP model the link & physical are one?

I'm currently learning about the OSI model and the TCP/IP models, and I was wondering: Why in the TCP/IP model the physical layer and the data link layer are combined? I'll state how I understand the ...
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2answers
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Why router can't be used for converting different model of network but gateway can do this?

We know that Router can't be used for converting different model (e.g OSI model to TCP/IP or TCP/IP model to OSI) of network. It isn't a multiprotocol converter. But gateway is a highly sophisticated ...
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1answer
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What is SLIP good for? [closed]

I read a bit about SLIP in few places, and from what I understand, the goal of this protocol is to allow the transfer (or encapsulation) of IP packets between hosts over a serial line. But I don't ...
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lan with multiple ip [duplicate]

If imagine lan assigned ip from from this range (192.168.1.0/24) then can we assign another ip from same subnet mask? If no why?
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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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2answers
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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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WAN ip address looks like private ip, but whatsmyip shows a public ip address [closed]

Let me preface this by saying that I'm not very good with internet networking, but I tried my best to gather information. So I've been meaning to do some port forwarding to open a server, but I got ...
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1answer
60 views

Must the host IP be contained in Router's subnet?

The settings are: manually set my host IP: 10.0.1.6/24, gateway: 10.0.0.138/24 they both know each other's MAC (arp -a shows the list) and there is a direct physical connection between them. From the ...
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2answers
144 views

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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Definition of a socket [duplicate]

I wanted to confirm whether the definition of a socket I've understood in a computer network context is true. A socket is file who is unique and named by local IP,Local port, Foreign IP and foreign ...
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2answers
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Can I assign one of my publicly available IP address to my AWS instance?

I would like to be able to use one of my publicly accessible ip addresses directly with my aws cloud instance. Is there a way I can assign or transfer one of my ip address to aws? My ARIN registry ...
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2answers
54 views

Can Vendor User Mac Address of Another?

I heard that each vendor is given a specific start in the Mac Address to use. What's the problem of me creating a company and using the start of Mac Address given to google or Cisco? how is this ...
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2answers
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How an intranet can be invisible to the IP module if the IP module allows a non-networked device connect to a network system?

A quote from RFC 791 document "Fragmentation, transmission and reassembly across a local network which is invisible to the internet protocol module is called intranet fragmentation and may be ...
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Finding IP address [duplicate]

I have a device (logger for data acquisition), ut seems that someone has changed it's default IP address and lost it. I can't access it. Is there's a way to find it's IP?
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1answer
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Duplicate IP in one LAN

I have a small LAN. there are: One linux PC with IP x.x.x.10 an unmanaged switch two different devices that share the same IP (x.x.x.1) (lets call them device 1 and device 2). The idea is to power ...
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1answer
37 views

Cisco Packet Tracer Hub IP

The problem that I'm facing has to do with the labeling above the hub's. I tried every possible hub in Packet Tracer and none of them had the configuration for IP. My guess is that the IP given is the ...
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1answer
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TCP IP Packets in 5G

How TCP/IP packets behave in 5G communication with shorter time slots duration. Does shorter slot duration improve the TCP/IP packet level latency.
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1answer
103 views

Static routes and subnetting

Network: 10.0.0.0/24 I decided to divide it into 4 sub-networks: 10.0.0.0/26 10.0.0.64/26 10.0.0.128/26 10.0.0.192/26 If I have to configure static routing on an external router, can I use the ...
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Does NAT change the L3-Encapsulation at all?

Let's say that a packet I sent requesting for a https server successfully reaches my target (NAT) router. The router receives it and through port-forwarding/triggering policies, it knows it has to ...
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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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1answer
53 views

How does deep packet inspection (DPI) extract metadata from packets?

DPI software extracts metadata (as an additional function apart from classifying applications / protocols) But how does it do this? For classification, I get that you can use pattern matching or port-...
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3answers
55 views

How to make 2 diffrent networks in router ping each other

Hello i have this 2 routers how i can make them ping each other and alos the devices connected to them
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2answers
61 views

Why does the Transport layer break data into packets? How does that make things reliable? Isn't the Network layer doing the same thing?

I'm new to CNs and there is something that I can't yet grasp. Why doesn't the Transport layer let the Network layer do all the splitting up? How does segmentation make things reliable? Also, I ...
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5answers
144 views

How is an IP packet sent to the gateway?

This is some route command output sample: $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.240.1 0.0.0.0 ...
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2answers
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How to tell if a device on the network is an access point?

Let's say we have a network with multiple access points. The command arp -a can be used to list the IP addresses and physical addresses of the devices that are on the same network. Now, is there a way ...
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2answers
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It is possible to have multiple webservers running on same port inside one network?

Lets say we have a network A with two webservers inside it, S1 and S2, both hosting a website on port 80. When a client from a different network is addressing A:80, which host inside network A, will ...
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1answer
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In TCP, when a receiver starts sending duplicate ACKs to the sender, does it also send ACKs for packets it has received past the hole?

I know that if a receiver sees holes in the packets it receives, it starts sending duplicate ACKs containing seq numbers of missing packets. At this time, the receiver is also receiving packets that ...
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1answer
58 views

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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1answer
31 views

How does NAT modify the headers correctly?

How does the process of replacing the incoming message (say from stackexchange) to the router, and modifying the header with my PC IP happen? How does the router know which IP to insert there? Is ...
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1answer
200 views

IP Address Direct Assignment

What does it mean when a "whois" report says that an IP Address is owned by CloudFlare and the "net type" is "direct assignment"? example follows: NetRange: 104.16.0.0 -...
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63 views

Eigrp flapping while using natting with route map

I have configured a topology which contains ip sla , route map , dual natting.It work perfect but when I used route map natting the eigrp become flapping and show the error is "retry limit ...
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1answer
41 views

Did a "network hub" actually send and receive all data to every node? [duplicate]

In the early 2000s, I went to a store and bought a Netgear "network hub" either exactly this one, or extremely close to it: https://upload.wikimedia.org/wikipedia/commons/d/d9/...
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How do i know which subnet mask should i use for an ip address of 135.135 [duplicate]

If i have to make two separate subnets for two different users like one for teacher and one for the students
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1answer
72 views

How does a device receive default gateway IP address?

When and how does a device get information about default gateway in LAN? I know you can define default gateway statically, but which protocol is used when it is not statically defined? Is it from ...
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0answers
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Could someone please clarify my understanding of this question? [duplicate]

I have been asked to use a particular IP address for a homework lab. The IP address is 218.179.169.7 and I have been asked to create 24 subnets and use the 16th network address. I dont fully ...
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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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2answers
128 views

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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0answers
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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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5 views

Advertising same ip address from 2 locations [duplicate]

Can you pls. Explain advertising same ip address from 2 locations (Active/Passive)
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289 views

Possible causes of ICMP Destination unreachble - Port unreachable

Are there any other causes, apart from the specific port to be reached being closed, that can lead to an ICMP Destination unreachable - Port unreachable message? What are possible reasons for this ...

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