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Questions tagged [ipv4]

For questions about Internet Protocol version 4 (IPv4); as specified in RFC791.

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How to Obtain IP Address for AMT Network Adapter on HP Z4 Workstation? [closed]

I'm having trouble using MeshCommander to connect to the AMT in my HP Z4 Workstation because I don't know the IP address, and MeshCommander isn't finding anything. According to the HP Bios Simulator ...
quarks's user avatar
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What does a byte-boundary mean in this example from Tanenbaum's book on subnetting? [duplicate]

To make CIDR easier to understand, let us consider an example in which a block of 8192 IP addresses is available starting at 194.24.0.0. Suppose that Cam- bridge University needs 2048 addresses and is ...
Don Draper's user avatar
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0 answers
15 views

Network Socket Address format used in Cisco ASA syslogs

I'm getting syslog logs from CISCO ASA where the ip addresses are coming in what I would call a non-standard format: The IP with port is being logged as 'd.d.d.d/port' (e.g. 10.0.1.2/63313') so it ...
Neil Walker's user avatar
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45 views

How to Route All Traffic from Multiple VLANs through a Specific Public IP in pfSense

I'm managing a pfSense setup with multiple public IP addresses ranging from 198.51.100.241 to 198.51.100.246. My ISP has also routed a subnet (203.0.113.1/24) through one of these public IPs (198.51....
JohnDow's user avatar
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3 votes
2 answers
702 views

In IPv4 Fragmentation, should the first block be necessarily the closest smaller multiple to 8

Is it mentioned in any RFC's that when one is splitting a Datagram into fragments, the bytes in the first fragment should be "the closest multiple of 8" or is it just a standard ...
mrtechtroid's user avatar
1 vote
1 answer
46 views

Nested Network with same IP Space

I have a router (Teltonika RUT) that is connected via its WAN port to a network (let's call it "Big"). The IP Space of the "Big" Network is 192.168.1.0/24 with the Gateway on 192....
bgc's user avatar
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1 answer
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How localhost and its opposite 0.0.0.0.0 works

Here I am running an application on a computer, host=localhost, the application runs on localhost:5000, or 127.0.0.1:5000. When the computer accesses 127.0.0.0/8, or 127.0.0.0 subnet mask 255.0.0.0, ...
hodini's user avatar
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-1 votes
0 answers
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Perform subnetting and assigning address to host [duplicate]

Question : An organization is granted the following block of address 200.166.16.69/18. The organization need to create 10 subnets from the block. Perform sub netting and assign addresses to hosts. ...
Ankit Chauhan's user avatar
2 votes
1 answer
77 views

Name for this network range formatting?

I'm working with an FTP server that only accepts IP ranges in this format: 192.168.128-255.0-255 What's the proper name for that format or presentation ? It is none of: CIDR: 192.168.128.0/17 Subnet ...
Criggie's user avatar
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1 vote
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Update IP Whois Objects using RIPE.net API

So I've searched around RIPE.net and other sources, haven't been able to find an example of how I can do this, as I am not an ASN operator etc. I've essentially got my RIPE.net Account added to some ...
Akht's user avatar
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1 vote
2 answers
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What exactly does the term "main network" mean in subnetting?

In the computer networks course, we solve subnetting questions together with the teacher. There is a term we call the "main network". As far as I understand, we fill in this according to ...
Furkan KARADENİZ's user avatar
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15 views

How is the number of sub-networks calculated? [duplicate]

I have lately taking interest in networking so I picked up a book to get acquainted with networking principles. The book I have chosen is that of Glen E. Clarke "CompTIA Network+ ...." which ...
Achraf Badiry's user avatar
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0 answers
13 views

Where is 1.1.1.1 really located? [duplicate]

I'm courious how this works: When ping-ing 1.1.1.1 I get results of roundabout 15 ms, where 1.1.1.1 is located in California, according to iplocation.net. When ping-ing a random ISP from California I ...
Justin Time's user avatar
2 votes
2 answers
68 views

what information needs a router to make a decision?

How does a router that receives a packet know what to do if it doesn’t know the subnet mask of the IP that sent the packet? The reason for asking this is that I didn't see any field in the IP header ...
netuser2024's user avatar
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2 answers
81 views

Do destination hosts decrement the TTL?

I was trying to understand more about traceroute when I stumbled upon this site and I have a question about this diagram: As you can see in the diagram, the destination host S1 receives a packet ...
Noob_Guy's user avatar
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2 answers
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IPv4 Address space for PTP links

I operate a relatively small ISP (around 1k households). We have passed the stage where a single router does not cut it anymore. As a corollary, we have to link routers to each other. For this, we've ...
Aloha's user avatar
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Identification field in ipv4 [duplicate]

What is the actual use of identification field in ipv4 and also does the same fragment packet Will share the same identification value
Darevil294's user avatar
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1 answer
186 views

How to remote access CCTV's device behind CGNAT for IPv4, and device doesn't have support for DDNS IPv6? [closed]

TL;DR Multiple locations with local CCTV. How to remote access all of them, with an ISP that services IPv4 behind CGNAT and the DVR doesn't supports DDNS for IPv6. DVR also offers API, SDK, P2P and ...
Justcurious's user avatar
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0 answers
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Private IPV4 Address Range [duplicate]

There are numerous reference about private IP address range which can not be routed to the internet. They are: In class-A: 10.0.0.0 to 10.255.255.255 (10.0.0.0/8) In class-B: 172.16.0.0 to 172.31....
user3103957's user avatar
0 votes
1 answer
72 views

IP fragmentation and PMTUD

I have 2 questions. 1) According to a lot of sources, when IP packets gets fragmented, in this case, lets take icmp, the icmp header is present only in the first packet. But I have observed on some ...
RRHS's user avatar
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1 vote
1 answer
78 views

Would a /24 public ip range typically be from the same country?

Would a /24 public ip range typically be from the same country? This to reduce the amount of ipstack requests, checking from what country an IP is. (due to bot requests)
MichaelD's user avatar
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1 answer
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What is hiearchy of IP addresses? [duplicate]

What is structure/hiearchy of IP addresses? I mean, is mandatory that IP address e.g. 216.9.10.0 is subnet of 216.9.0.0? Of course many times that is the case and IMO it would be logical, but I have ...
worner's user avatar
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1 vote
1 answer
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Wrong subnet configuration works anyway in a shared bus, but doesn't work in switched lan. Why?

I was told that this configuration (which contains an error in DNS mask which is /23 instead of /24) works only because it's a SHARED bus. If it was a SWITCHED lan, the DNS responses from DNS to A ...
Allexj's user avatar
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3 votes
5 answers
2k views

IPv4 class E IPs

can someone explain to me why we cannot use the class E IP space? I know it's reserved but this is a huge chunk of IP addresses they could make available. Would this bring such huge issues that it ...
krys's user avatar
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0 answers
14 views

about subnetting ip adress 172.16.0.0 [duplicate]

can you explain why we have 172.16.0.0 to 172.31.0.0 so it can't be for example 172.13.0.0 to 172.35.0.0. And also why is 192.168.0.0 and is it possible to be 192.160.0.0? thank you
Giorgi's user avatar
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1 answer
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Geolocation specific ASN

question: is it possible to determine the geolocation of a city/region of a specific ASN? For example, Telecom Italia has many ASNs. Is it possible to know for each one "which soil" they ...
vincenzogianfelice's user avatar
0 votes
1 answer
129 views

I want to set up a MSTP Redundant Network

For the past few days i have been trying to get multiple VLan's working that are redundantly connected. One VLan would be connected through a controller and to the other switch. Then a second cable to ...
TomB's user avatar
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0 votes
1 answer
88 views

Get all reachable IP addresses within a private network [closed]

Is there a way to get all reachable IP addresses within a private network. I know that we can get all active devices' IP addresses within same subnet using arp. I was wondering if something similar ...
Atharwa Adawdakar's user avatar
0 votes
2 answers
74 views

How do you assign sequential IP addresses to individual ports on a switch? [duplicate]

I am looking for a non-complicated way to set up a network of 50 interchangeable devices such that whenever I plug a device into a specific port on a switch, I will always get the same IP address ...
Curtis's user avatar
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0 votes
2 answers
108 views

Communicating to a device with a random IP, Subnet Mask and Gateway

I think am looking for a way to reliably communicate with devices connected to the network with "wrong" configurations. Our company sells products that can have their network settings ...
nickolaij's user avatar
1 vote
1 answer
490 views

Explaining the entries in routing table

I would like to ask for help with explaining every particular entry in routing table. That is what I receive after calling route print in my PC, based on Windows: So my understanding is: 0.0.0.0 ...
Bratw's user avatar
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0 votes
2 answers
130 views

Communication with different subnet masks

So I try to explain the dilemma. I have 2 groups of clients and one server. I want these groups to only communicate with the server. This means that each device in these groups should see the server, ...
nub's user avatar
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0 votes
2 answers
81 views

Advertising IP prefixes to the internet using BGP

I am studying BGP at the moment. From what I've learned, in order to participate in routing on the internet and use BGP, we need to register a public provider-independent IP address block and a public ...
Mitrixsen's user avatar
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1 vote
1 answer
79 views

how does a router know an ip address's network prefix when it comes to CIDR

Let's say I start a new company and lease a block of ip address 222.123.123.0/25 from Internet registry, so one of those ip address 222.123.123.4 is my main web server. A customer from a different ...
whoisit's user avatar
  • 111
1 vote
1 answer
222 views

Understanding IPv4 model of operation

I'm new to networking and reading RFC791 about IP protocol specification and got some question regarding the paragraph 2.2 Model of Operation. Here is what is discribed: The internet module prepares a ...
Some Name's user avatar
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0 votes
1 answer
74 views

Why are BGP tables suddenly filled with IPv4 routes?

According to article I looked at, bgp routing tables are approaching a maximum size and this is linked to IPv4 exhaustion. Why is this problematic and what is the cause? Will this be a problem with ...
Thomas Stokes's user avatar
0 votes
3 answers
351 views

Can I use the network and broadcast IP addresses of a /24 subnet, when the /24 subnet is included in a larger /22 subnet range for NAT?

I'm wondering if I can use the network and broadcast IP addresses of a /24 subnet, when the /24 subnet is included in a larger /22 subnet range for NAT? PS: Please consider that 198.51.0.0/22 is ...
Ulteara's user avatar
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0 votes
1 answer
79 views

What is the RFC 791 64 octet header?

I'm trying to understand the PDU sizes as it traverse the TCP/IP model. RFC 791 says the IP protocol is required to accept datagrams of 576 octets. ( 512 octets, plus up to 64 header octets). I know ...
Buster Poindexter's user avatar
1 vote
1 answer
52 views

Maintenance access to customers over VPN with same network on each side

We are a small company that manufactures machines for the industry. What I need today is an access to the machines when they are in our workshop (construction and adjustment) but also, and this is ...
Meloman's user avatar
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1 vote
2 answers
72 views

Is it a thing to subnet an address but still use initial network host?

Hei, Suppose we have 192.168.0.0/24 and we subnet it as 192.168.0.0/25. Is it a normal thing to configure hosts with IP addresses in both /24 and /25 address spaces ? We consider /24 and /25 to be in ...
Iasmina's user avatar
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1 vote
2 answers
361 views

Practical uses of directed broadcast

What are directed broadcast addresses used for in practice? To be clear, an example of a directed broadcast address is 192.168.1.255 for the network 192.168.1.0/24. On the other hand, the limited (or ...
Matthias Braun's user avatar
1 vote
2 answers
352 views

How does subnetting solve the problem of IPv4 address shortage?

Reading articles on the web, they all say that "subnetting solves the problem of IPv4 address shortage by dividing a large physical network into multiple smaller networks". I do not ...
penguin99's user avatar
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0 votes
2 answers
1k views

UDP fragmented packets not reassembled

I have been working with a device that sends me UDP packets heavily. I'm trying to capture those packets in my Linux machine (Ubuntu 22.04.2 LTS) with Python programming language. But, most of the ...
mustaphos's user avatar
1 vote
1 answer
74 views

CISCO cellular Router cannot reach network via my PC

I configured the cellular and my router is connected to the internet ping (5/5) Success but I still cannot access the internet via PC Here is my running-conf Current configuration : 2271 bytes ! ! ...
breka's user avatar
  • 11
0 votes
1 answer
186 views

Tracing a route, from 127.0.0.1 through my network to 20.43.161.105

Greetings in the name of network engineering! BACKGROUND: The IPV4 network consists of the following nodes: Node 0:127.0.0.1 Node 1:10.1.1.1 Node 2:192.168.0.1 Node 3:192.168.1.1 Node 4:210.x.x.x Node ...
George Arthur Rosal-Talbot's user avatar
1 vote
5 answers
101 views

Are there any methods of differentiate between a single computer and a NAT router?

As far as I know, a traffic from a NAT router should appear similar to traffic from one computer with a single IP address. If you do not have any access to a network (let's say you are an ISP), can ...
jiwopene's user avatar
  • 113
0 votes
1 answer
80 views

Can, and should, a link local address be used for a gateway in IPv4? [closed]

I was just experimenting with IPv6 and hypervisors, where I made productive use of the IPv6 link local address to route packets towards a tap device to establish communication with a virtual machine. ...
fdr's user avatar
  • 103
0 votes
1 answer
1k views

Sharing same IP address inside LAN? [duplicate]

Q: if 2 devices A and B share same ip address in LAN, can device A retrive all messages whose destination is device B? I think this depends on how the LAN is configured. If it's wireless then device A ...
Albert's user avatar
  • 1
0 votes
1 answer
128 views

RFC 1918 nonsensical sentence

I am doing an intern and now under a training. The instructor suggested us of reading the RFCs involved with the topics covered in class. In RFC 1918, they say "An enterprise that decides to use ...
美日月's user avatar
0 votes
1 answer
133 views

Public and Private IP address range confusion [duplicate]

class A private IP range (10.0.0.0 to 10.255.255.255) class A public IP range (1.0.0.0 to 127.0.0.0) In these 2 public and private IP ranges, the private IP range is also included into the public ...
Sahan's user avatar
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