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.
892
questions
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12 views
How are IP datagrams transmitted from routers to AP to destination? [closed]
Assume two 802.11 wireless networks are connected to the rest of the Internet via a router as shown in the figure. The router has received an IP datagram with the destination IP address 24.12.7.1 and ...
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0answers
16 views
Can i create home VPN with nonpublic static IP? [closed]
I would like to create home VPN so I can access devices on my network from anywhere. I installed DD-WRT on my router to get VPN capabilities. But here lies the issue that I'm new to networking and I'm ...
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2answers
23 views
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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0answers
44 views
Why we need both private IP and Mac Address? [duplicate]
I spent hours on reading but still no clear answer to my question.
Why we need Both private ip address and mac address?
If I'm not wrong be can't only use mac address to prevent leaking it online (why ...
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2answers
51 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
21 views
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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0answers
8 views
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
80 views
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
18 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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0answers
33 views
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
100 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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2answers
32 views
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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0answers
22 views
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:
...
2
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1answer
46 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
49 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
37 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
117 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
34 views
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
79 views
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 ...
0
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1answer
32 views
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
46 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 ...
1
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1answer
80 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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0answers
34 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
36 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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0answers
9 views
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
63 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
11 views
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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0answers
12 views
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
91 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
9 views
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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0answers
7 views
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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0answers
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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1answer
192 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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0answers
9 views
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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2answers
55 views
Is it possible that multiple devices (servers) have the same external ip? [closed]
When I check devices' external IP (ipv4) from my home I see the same numbers for my phone and laptop. Imagine these devices are servers, both host different sites, and have 80 ports opened. From which ...
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2answers
30 views
rules regarding IPV4 fragments and piecing them together
I'm rolling off my own TCP/IP stack for DOS and I have a question on IPV4 packets.
Assuming that a client sends multiple IPV4 fragments, I would predict the MF flag would be set for every fragment ...
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1answer
49 views
How is the subnet mask detected over the internet with CIDR (classless inter domain routing)?
Lets say there are two public IP addresses. One is 21.120.12.8/16 and the other is 21.120.12.8/8, they are different network IDs but when used over the internet how are they both differentiated? Or is ...
3
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1answer
48 views
Recommended IPv6 prefix size for PPP to a single host?
I am using PPP to create a IPv6 connection to a remote host.
What is the recommended IPv6 prefix size for a single host at the other end of the PPP connection?
Should it be /128, because there is ...
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1answer
39 views
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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1answer
22 views
IP flow interpretation on Logrhythm Netmon
We have a Logrhythm freemium network monitoring solution depending on port mirroring using span ports on switches to receive all traffic and analyze it. But I cannot understand the output.
If I am ...
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1answer
98 views
Why do we need ATM if SONET/SDH can carry IP directly?
If SONET/SDH can carry IP, and ATM rides on SONET/SDH, then why do we need to encapsulate IP inside ATM?
That makes "IP over ATM over SONET/SDH". What's its benifit over "IP over SONET/...
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2answers
60 views
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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1answer
268 views
How to configure IP addresses in cisco packet tracer?
Hello I am working with Cisco packet tracer. I have two laptops connected to a wireless router with IP addresses assigned using DHCP. The router's Internet IP address is 10.1.0.0 and the LAN address ...
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2answers
23 views
Basic question in finding the port of a website
To my understanding, every time someone is hosting a service e.g. mysql server, there is always a server IP (or domain name) and a Port needed to reach the service (e.g. www.servername.com:3306).
...
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1answer
56 views
IP masquerading and nat
what is the difference between IP masquerading and nat?
do both of them have the same limitation?
in the line "IP masquerading cannot provide full internet connections to the hosts which hide ...
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1answer
47 views
Does every link between routers demand a new subnet?
This might be a stupid question but I'm new to this.
I am studying a class about basics of networking and I don't really understand one question that we have.
We need to a divide the given IPv4 ...
0
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1answer
15 views
How to ensure packet was created within certain time?
I am creating a custom protocol over UDP and I want to use a low number of bits for the sequence number. This means that the number can wrap relatively fast. Is setting the TTL for the outgoing ...
1
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1answer
83 views
How does Network Layer behave when client received a unicast DHCP offer?
I went through various stack exchange post to understand the concept of DHCP offer when it comes as a unicast to client from the DHCP server.
A server can send a unicast DHCP offer since it knows the ...
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0answers
12 views
How does 2 computers both behind NAT routers handle communication? [duplicate]
Currently reading up on TCP/IP protocol stack, while I was reading about the Network Interface layers, I started reading about NAT, and how it meant to decrease the amount of IPv4 used, by using the ...
