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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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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How is 65535 bytes is total length of IP datagram?
The maximum size of an IPv4 packet is 65,535 because the Total Length field is a 16-bit unsigned integer, which has a possible 65,536 values (from 0 to 65,535).
This created 2 confusions for me.
Say ...
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21
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How to use IP pool
I am just beginner, I just want to setup my mini data center and for testing i get a FTTH connection and /30 ip pool, ISP reply is something like that, "IP Pool 103.15.xx.xx/30 has been assigned ...
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What are the IP/MAC addresses of requests between 2 different subnets? [closed]
Assume that networks 172.15.10.0/24 and 172.15.11.0/24 are connected through a router with interfaces 172.15.10.254 (MAC3) and 172.15.11.253 (MAC4).
If host A sends a packet through its network ...
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How can i find device type and name in linux terminal without install nmap and other similar tools from it ip address? [closed]
I'm looking for find a way to get device name and type like ESET Connected Home Monitor .
Eset :
Connected Home Monitor can help identify vulnerabilities in your home network such as open ports or a ...
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15
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Does my peer to peer network acrhitecure makes sense? [closed]
Basically node has a TCP listener and waits for incoming connections, when one does connect it does handshake and stuff.... Other then TCP listener node has TCP client that connects to the TCP ...
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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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DHCP Discover Broadcast and its IP (255.255.255) [duplicate]
Cheers, I am trying to learn more about DHCP, and when studying about the session that DHCP goes through every one mentions that it broadcasts a discover message at IP: (255.255.255.255) (as seen here ...
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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 the host part of a Mask is 254 (256-2) instead of 253?
Don't hate me for being such a newbie but I'm so confused. If we have 32 bits, each octet adds up to 255, why the host part is 254 (in a 255.255.255.0 mask) instead of 255 - 2 ?
Thanks so much for ...
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How IP packet's payload bigger than the whole former PDU (segment)? [duplicate]
As far as I know:
File is too big ---> Fourth layer (TCP or UDP) divide it to a multiple segments ---> Then each segment encapsulated separately into a packet.
What means if I have 10 segments, ...
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How does a computer determine that an Ethernet frame contains an IP packet? [duplicate]
So far as I can tell, there is no "Next Protocol" ID at the Ethernet / data link layer.
Nor do IP packets seem to contain any magic numbers for identification purposes.
Does the OS bind each ...
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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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Inherent flaw in stateless firewalls?
I am but a lowly (software) developer dabbling with setting up a network in AWS and am having trouble understanding the fundamentals of stateless firewalls, or Network ACLs as they're also referred to ...
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How are IP broadcasts handled at lower levels
When I use a broadcast IP address, for example 198.255.255.255, what will happen when it gets passed down to the link-layer which will then look for the corresponding MAC address in your ARP table. ...
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Custom option in IP header
I would like to add (or piggyback on an existing not used) a custom option to the IP header. I've full control of the IP stack at both end points, but I've no control on all the hops in the route (...
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why ip adresses are divided into network portion and host portion when we already have NAT [duplicate]
I don't understand why ip adresses are divided into network portion and host portion? is the host portion really necessary when we already have NAT?
for example, if ip addresses only have network ...
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point-to-point at IP layer
I was reading one of 5G standards specifying signalling transport https://www.etsi.org/deliver/etsi_ts/138400_138499/138472/15.06.00_60/ts_138472v150600p.pdf and noticed (section 6):
The IP layer of ...
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Is there any benefit of combining several unicast into a single multicast?
If a node has to send the same data to multiple nodes, it is obvious that multicasting the data would improve bandwidth usage. However, if a node has to send different data to different nodes, would ...
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How does a host use its default gateway? [duplicate]
Each host has its own default gateway and uses that to send packets outside of its network. But in each packet, there is only 1 header field for the destination IP address. So, how can that host send ...
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Cisco Packet Tracer gives "Invalid IP Address" when I assign an address to a router [duplicate]
I was given an exercise where I have an IP address range and I have to configure multiple sub networks from that range. The address is 238.61.192.128 with the mask 255.255.255.128 (/25). I created my ...
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If current IP ranges for PCS are in conflict with a new systems network, how do you re-IP the PCs and the Servers?
I have a question about IP conflicts. Let's say you have a company building full of PCs on a network. Then a firm buys out that company and institutes its new system and new network for that building. ...
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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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3
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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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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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290
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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