Questions tagged [ipv4]
For questions about Internet Protocol version 4 (IPv4); as specified in RFC791.
680
questions
0
votes
2answers
45 views
Meaningless bits in CIDR notation
Is specifying meaningless bits valid syntax in CIDR notation? For instance, the netmask of 192.168.13.0/16 is 255.255.0.0. In this case, the last two octets (00001101 00000000) are meaningless because ...
0
votes
1answer
16 views
Why does yealink ip phone is not getting ip address from voice vlan?
I have configured separate vlan for voip and connected interface to it (as shown below). But the phone is not getting ip address automatically.
switch- cisco 2960-x
phone- yealink
I had tried: (on ...
0
votes
0answers
11 views
Intermittent Connection Problem between two Computers [closed]
Hey guys I have an odd problem I'm trying to troubleshoot but can't figure out what's going on
Setup:
Computer A is on subnet 192.168.4.0 with ip 192.168.4.145
Computer B is on subnet 192.168.19.0 ...
0
votes
3answers
77 views
Why can my ISP use 172.39.29.71 as local network IP? [closed]
I just check my IP routing? and it turns to be:
IP:10.29.66.27 -> 172.39.29.71 -> x.x.x.x my outmost IP, which I get by Google "my ip".
As far as I know, 172.16.0.0/12 is the one of the 3 private ...
0
votes
2answers
54 views
Sending an ipv4 packet to the Destination IP without a router?
We are replacing a "RF modem + Router system" with a Software Defined Receiver.
After analyzing the receiving and sent signals we found out that an IPv4 UDP packets have been sent and received.
The ...
0
votes
1answer
61 views
What do you need apart from registering IP addresses to use them?
I need to connect to a certain Site from several public IP addresses (~1 million).
Assume that I am Bruce Wayne so I could spend several million dollars on this. The site at least for now is not IPv6 ...
2
votes
1answer
49 views
Is this possible (NAT??)
I have a device on another network, say it's IP is 10.1.1.1
I want to ping it from my own network, say host 192.168.1.1, but I want to ping an address in my local segment to do so,so 192.168.1.2.
Is ...
1
vote
1answer
33 views
Assign a new public and static IP to a router behind my main router [closed]
What can you suggest to bring a second public and static IPv4 so I can configure my WAN-A interfase with my primary and an additional secondary IP settings so I can route all the traffic from the ...
0
votes
2answers
71 views
Why can't we have duplicated IPs?
This may be a really dumb question, but I like to turn upside down what I already know sometimes, that way I can learn more.
For example, given a network 192.168.0.0/24, I have a device inside with ...
1
vote
2answers
30 views
How many public static ips do one need if a PC is behind a wireless router?
If a PC is connected to internet through a wireless router.
How many public static ips do one got to get from the ISP.
Do the router and PC both require one static IP.
What if I want to add more PC ...
1
vote
2answers
57 views
how do hackers get public ip off packet sniffing [closed]
That may be a dumb question but I am a student in computer science(security & networking) and I gotta find someone who can clearly explain this concept to me.
If the server of an app. 'x' is used ...
-1
votes
3answers
29 views
ACL for DNS clarification
I do not understand why the second ACL is needed if all I want is to ensure all networks use a certain DNS server (for example 192.0.2.1)
access-list 112 permit udp any host 192.0.2.1 eq domain
...
3
votes
2answers
41 views
Overload PAT Question
Learning details of NAT PAT. I understand basics wherein the PAT router incorporates a source port to ID the private address computer communicating out on the public address, enabling the public ...
0
votes
0answers
19 views
How is it possible to create 6 subnets? [duplicate]
The following task presents me with an insurmountable obstacle...
Given is the following:
IP: 192.168.40.0
Subnetmask: 255.255.252.0
Task:
Form 6 subnets over this network and enter ...
1
vote
1answer
73 views
How does IP assignment work for servers and data centers
If I had an IP address (for example bought range for my company), and 2 ISPs fibres, how would it be possible to set my network card to have same IP adress accessible from both connections? (know its ...
0
votes
1answer
15 views
Varible Length Subnet Masking - Smaller subnet with two larger subnets on each side?
Background:
I'm redesigning a network of virtual machines. The virtual machines are all on 10.0.2.0/24 and 10.0.3.0/29 networks, the physical network is a 172.32.255.225/28 network, which stands ...
0
votes
0answers
14 views
What would be the router's gateway IP address that is connected to a network containing two smaller networks [duplicate]
Assuming that we can use any available public address, we have two separate subnet masks 255.254.0.0 which contains 131,070 usable addresses (IP range 126.240.0.1-126.241.255.254) and 255.255.128.0 ...
4
votes
1answer
74 views
Same Vlan Name / ID on different switches network subnet same or different?
I have several switches (some on same floor and another on other floors) all connected to core layer 3 switches through trunk links.
One of the vlan id / name is repeated along the switches. May I ...
0
votes
2answers
46 views
Connection between two networks with different IPs and identical subnets?
How can we establish communication between two networks with different IPs but same Subnets?
Network Connection 1: (Factory Network for machinery)
I.P = 192.168.19.X
S.N = 255.255.255.0
G.W = 0.0.0.0
...
0
votes
0answers
13 views
IP block assignment [duplicate]
Let's say that an ISP manages the IP block 128.64.32.0/19, and assigns the block 128.64.32.0/22 to company A. Now, company B needs a block of IP addresses for 1234 hosts, immediately after the IP ...
0
votes
2answers
30 views
Hierarchical issue of Broadcasting on different subnets
I've got a problem that I can't seem to understand.
192.168.255.0 /24 is a valid network address.
The broadcast address for this network is 192.168.255.255.
192.168.0.0 /16 is a valid network ...
2
votes
2answers
54 views
How to handle ICMP-in-IPv6 or ICMPv6-in-IPv4?
Since ICMP and ICMPv6 have different IP protocol numbers, it's technically possible for an IPv4 host to receive an ICMPv6 packet or for an IPv6 host to receive an ICMP packet. Is the host's behavior ...
1
vote
1answer
31 views
How to tell apart the type of the mask(subnet-supernet-net mask)
Say we have the the IP address 10.2.8.230/24
Anyone could say the following:
It just represents a normal network:10.2.8.0/24
Or it is a subnet because normally this IP address is in the class A ...
0
votes
2answers
100 views
What does it mean when the last digits of an IP address change? [closed]
So in a case where I have an IP address, 162.158.68.xxx, what is happening when those values in xxx change?
I ask because I'm looking at requests going through to my application's server and one of ...
0
votes
2answers
44 views
Addressing for a WAN, LAN and DMZ
I was wondering about the addressing for certain types of networking areas...
I use 192.168.0.0 for a LAN network, 10.0.0.0 for a WAN and 172.16.0.0 for a DMZ. But I've been confused why a 10.0.0.0 ...
0
votes
0answers
12 views
Host address not host range? [duplicate]
can someone explain to me how to get the host address? I understand how to get the subnet answer but not the host address, and majority of the google searches / videos always give me the host answer ...
0
votes
0answers
28 views
Subnetting - IP Address Classes [duplicate]
I've been trying to get my head around subnetting but seems to be getting confusing with the classes and IP ranges within that class.
Example:
IP Decimal:10.2.225.234/22
IP Binary:00001010 00000010 ...
2
votes
2answers
50 views
ACL: Deny specific host not working
I'm trying to create an acl for use with a nat but I can't get the deny statements working.
All hosts on a private network should be accessible, except from a server which should not be accessible ...
5
votes
2answers
158 views
How to architect a globally distributed website, from an IP address perspective
I would like to have a website that is loaded fast from any point in the world. From my understanding, you need to take advantage of the data center "regions" at places like Google Cloud or AWS. That'...
2
votes
3answers
76 views
Is it possible that two servers were configured with the same ip under the same switch
I have two physical servers, their configuration as following:
ServerI:
IPADDR=10.1.1.5
NETMASk=255.255.255.0
ServerII:
IPADDR=10.1.1.5 (Same IP)
NETMASk=255.255.0.0 (different NETMASK)
Because of ...
0
votes
0answers
9 views
Given an IP address and a subet mask, how do I find the max number of subnets and usable host IP's? [duplicate]
my question is based on an IP address and a subnet, how can I find the maximum number of subnets and the number of usable host IP address per subnet. This is all IPv4 if that helps.
For example if I ...
0
votes
1answer
38 views
Access Localhost (Ubuntu -VM) from Windows [closed]
I use Ubuntu in my virtual machine and start from there my code projects. These project when active can be run under localhost:3000.
Now when i execute in Ubuntu ifconfig I get following result:
If ...
2
votes
2answers
60 views
Client timeout for Cisco IOS Static DHCP Pool
I'm not a network admin, but I have an old Cisco Catalyst 3560 for my network. I've successfully set up a DHCP Pool:
ip dhcp pool 192.168.0.0
network 192.168.0.0 255.255.255.0
default-router 192....
3
votes
1answer
81 views
Public and Private IPs
I wondered if someone could explain this to me.
At work we have a firewall that connects to the Internet and has an external IP configured on it via DHCP. The firewall's WAN port connects to an ...
2
votes
1answer
44 views
Cisco ASA 5505- My subnet mask is different from Show Route
While I was troubleshooting a DNS issue on my 10.10.10.0/30 subnet, I noticed the Local (L) and Connected (C) has different values. I configured the 10.10.10.0 network to use 255.255.255.252 has the ...
0
votes
0answers
20 views
Questions about IP addresses [duplicate]
So, I have to research IP addresses, and there are a couple of things I don't quite understand. In my test there will be questions like 'Which of those IP-addresses is private' or 'which of those is a ...
1
vote
2answers
44 views
Does an IP address with host part zero's represent a network, or a network interface in a network?
If the host part of a IPv4 address is all zero (e.g. 192.168.1.0 in a network with mask 255.255.255.0), does the address represent the network, or a network interface in the network?
Thanks.
2
votes
1answer
47 views
IHL(Internet Header Length) field is 4 bit long and specifies the header length in 32 bit words. What does it mean?
I am trying to understand IPv4. I cannot understand
2
votes
1answer
43 views
What can an IP address be assigned to?
What can an IP address be assigned to?
A network interface, which is what I thought originally. (I seem to hear a network interface can have multiple IP addresses assigned to it, and if it is true, ...
11
votes
3answers
1k views
Are the IPv6 address space and IPv4 address space completely disjoint?
Tanenbaum's Computer Networks says
Finally, IPv4 addresses can be written as a pair of colons and an old dotted
decimal number, for example:
::192.31.20.46
Does it mean the IPv4 address space ...
1
vote
1answer
39 views
Packet tracer - why “show ip route” shows network address
This is just a quick question I am wondering out of curiosity.
When I set up a network in packet tracer, why does "show IP route" show the network address (example: 199.120.5.64/27) and not the IP ...
1
vote
1answer
29 views
Public IP addresses on cloud platforms [closed]
My question is about cloud platforms like AWS or Azure. Whenever we create an instance (VM or VPC), AWS allocates a set of public and private IPs for that instance.
Now the number of user accounts (...
0
votes
1answer
37 views
How does a host figure out the broadcast domain for a /23 [duplicate]
If a host has IP 192.168.20.150 with DHCP server say 192.168.20.10, how does the host know the bounds of the subnet? is this where proper network subnetting comes in?
To clarify... the DHCP server ...
7
votes
2answers
2k views
What is IP squat space
I came across this article and I'm trying to understand what is going on here, I found some packets on my network containing 22.0.0.0/8 and 29.0.0.0/8 IP range and It's based on:
https://en.wikipedia....
1
vote
2answers
187 views
How to block youtube url on a cisco router
How can i block youtube on a cisco router?
I have already used class map as seen below
class-map match-any url-block-class
match protocol http host "*youtube*"
!
policy-map block-class
policy-map ...
3
votes
1answer
82 views
Host IP address vs gateway IP address vs DHCP IP address
What is the difference between a host IP address, a gateway IP address, and a DHCP IP address when setting up networking devices?
For example, when configuring a virtual network adapter for my VM, I ...
-1
votes
1answer
40 views
MAc address or IP address? which one gets used from my pc to router? [duplicate]
Question 1) which one is used nowadays? NAT or PAT?
Question 2) as I knew, when my pc requests some website, what happens is , the data(packets) from my pc go to router. then router makes the request ...
2
votes
1answer
44 views
IPv4 only host on a dual stack environment
I am looking into migrating to IPv6 at my company. Our plan is to dual-stack everything for now, however, we have a couple of local servers that are IPv4 capable only. The rest of our network will be ...
2
votes
2answers
93 views
How are IPv6 addresses grouped? [closed]
I apologise off the bat if this question is too basic to belong in this group. Perhaps it can be moved elsewhere if that's the case, or I can be directed to another SE site.
With IPv4 I have long ...
2
votes
1answer
40 views
Where is the block which caused IPV4 client can not access IPV6 Server
I read many documents which are saying if you are in IPV4 network then you can not access IPV6 network, for example when I was at home I can not access some IPV6 website, such as:ipv6test.google.com.
...
