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.
731
questions
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11 views
how to change ttl value on VM [on hold]
I have two virtual machine, ubuntu16(10.10.10.1) and centos7(10.10.10.2).
I want to create 3way handshakeing packets with different TTL value between them.
I am using scapy and setting ttl and in the ...
0
votes
0answers
11 views
I want to know about mac spoof [on hold]
I have done ip and mac spoof to my isp. It runs on static ip. Two device is connected on same lan i mean two router. Then im facing packet loss. If i change my subnet mask different from the other ...
0
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0answers
9 views
Why is the receiver dropping packets if the sender IP address is not contained in the routing table? [closed]
I noticed that the IP address of the sender of an IP packet has to be in the routing table of the receiver, otherwise the receiver drops the packet.
For example let's we have two hosts, h1 with the ...
-1
votes
0answers
12 views
What are these random IPs connecting to my server [closed]
I recently wrote a chat-program using Java. It follows the client-server-principle, so a client with my client-software is connecting to my server-software, running on a Raspberry Pi with Kali Linux.
...
-1
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0answers
14 views
How to calculate the number of networks hosting a certain number of hosts? [duplicate]
I have this address block: 192.168.0.0/24. I would like to know how many network hosting 25 hosts can be addressed within it.
I know this is a Class C address, so the the default mask is 255.255.255....
-2
votes
2answers
45 views
What's the DF flag mean in IP packet header?
In the IP package, there is DF flag: Don't Fragment.
I have doubt about it, is it mean let all the L3 device do not to fragment the IP packet (if the L3 device found it is bigger than MTU, device ...
0
votes
1answer
21 views
How to understand the Flags is IP_MF, what will happen?
For data packets whose length exceeds the MTU of the interface, fragmentation processing is required. The fields related to fragmentation in the IP header are as follows:
Identification - Used to ...
0
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2answers
54 views
Why do we need Dynamic IP, if all devices are already provided with IP address
Why there is a need for DHCP server, when all devices already have a IP allocated to them?
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2answers
88 views
Is this scheme- An Ip camera network completely isolated from rest of Intranet
IP camera network completely isolated from rest of the Intranet work and for connecting each IP camera at mutually 900 m TO 1.5 km distanc to switch near NVR about 800 to 1.5 km from each IP camera ...
0
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0answers
35 views
How to change Default Gateway on Hitron (Virgin Media) router?
Our office is having connection issues with Slack. Our internet provider is Virgin (UK) and the router is the Hitron CGNV4, and Virgin suggested that a reset using the button on the back of the router ...
0
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0answers
17 views
What is meant by “IP fragmentation is done on a 8-byte boundary”? [duplicate]
I was learning about IPv4 fragmentation and came across the follwoing line:
The data of the long packet is then divided into two portions on a 8
byte (64 bit) boundary, so that the first packet ...
3
votes
2answers
688 views
What determines the private ip addresses? [closed]
Right now, I am using internet at home, and my private ip address is 192.168.x.x.
At work my private ip address is 10.x.x.x.
In both of the scenarios, I did not play any role in selecting my ip, I ...
0
votes
1answer
72 views
Is this translation possible on a router, or do I need a proxy?
Is this possible, I cannot seem to find a solution for it..
Using NAT,I have this config (this is on packet tracer)
interface GigabitEthernet0/0/0
ip address 10.1.1.1 255.255.255.0
ip nat inside
...
0
votes
0answers
67 views
4 ssids with 4 public IP addresses on pfsense
I have a requirement for 4 WiFi SSIDs, each with a separate public IP.
As I need some sort of firewall I was thinking to get a pfsense Netgate SG-3100 that would have its WAN port connected to the ...
0
votes
1answer
55 views
Why Internet protocol is divided in rows?
In simple words, why IP packet is divided in rows each one is 32 bit in length?
For example this attached image shows the IP packet has 32 bit in the first row then another 32 bit and so on.
Is it ...
0
votes
3answers
92 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
1answer
65 views
What's the difference between DHCP Disabled or Relay on an access point?
I am trying to turn my old router to an access point for the new router, I assigned an IP address in the range of the new one and when I went to disable DHCP there was another option which is Relay ...
1
vote
3answers
100 views
How to do subnetting on IPV6 for non nibble boundaries?
As I was reading this article on How to: calculating IPv6 subnets outside the nibble boundary https://blog.apnic.net/2018/08/10/how-to-calculating-ipv6-subnets-outside-the-nibble-boundary/
The author ...
1
vote
1answer
39 views
Remote Host Neighbor Cache Entry State after Neighbor Solicitation request
When a Host A sends for the first time a NS request to another Host B, host B answers with a NA.
In Host A Neighbor Cache, the state Entry for host B gets from INCOMPLETE to REACHABLE, when NA comes ...
0
votes
2answers
74 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
votes
1answer
123 views
IP Camera (CISCO Packet Tracer)
I've been asked to simulate a topology, which requires me to implement 2 CCTV cameras in a network using Packet Tracer. However I realise that their isn't IP Cameras in PT, so how best can I simulate ...
1
vote
1answer
78 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
18 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 ...
8
votes
6answers
4k views
Could IPv6 make NAT / port numbers redundant?
From what I can tell, each process could get its own IP address, with loads of IP's to spare.
What would the drawbacks be?
Essentially, your host would become a router and each process is a host (in ...
0
votes
1answer
35 views
What happens if we try to access an IP Address that does no exist
Beginner Question: I just read an article talking about how the internet works and how routers make sure that packets arrive at the destination. However there is one thing that is not explained ...
2
votes
1answer
84 views
Setting Destination MAC address for RTP/UDP packets
I have a requirement where I have to send the UDP packet to a destination multicast IPv6 address. In addition to that the packets must also have corresponding destination multicast MAC address set. I ...
1
vote
0answers
21 views
routing with multiple NICs (connected to multiple APs) that were all assigned the same LAN address [closed]
I have 4 wireless APs based on the ESP8266. These APs all broadcast distinct SSIDs, but each serves LAN addresses in subnet 192.168.4.XXX. The subnet value is not configurable.
Then, I have a Linux ...
2
votes
1answer
43 views
Why does TCP need segments if the network layer automatically breaks things up into fragments?
I'm trying to better understand the difference between IP fragments and TCP segments (https://www.shubhsblog.com/tech/difference-ip-fragmentation-tcp-segmentation.html) and there's one thing I'm not ...
0
votes
1answer
52 views
How to get a static IP address? [closed]
I need to get a static IP address to access to a service that only allows specific IP (I can manage the whitelist).
The problem: my public IP is dynamic.
I'd like to :
be able to activate this ...
0
votes
2answers
88 views
Why does Nmap not detect a host which is active and responds to Ping?
I have connected to another laptop via the LAN cable, i am able to access the services running on the other laptop via Ip & Port. When i Ping that Ip, the machine is successfully responding. But ...
0
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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
1answer
30 views
localhost vs local IP address: traffic flow [closed]
Let's say I have a server with IP address 192.168.0.1 that is running a network service (I don't think it is important what kind - let's say a webserver on port 80).
If I am on the server itself and ...
2
votes
3answers
71 views
Do extension headers in IPv6 increase the header length
I was reading about IPv6. It says the header is of a fixed size i.e. 40 bytes, then how come is it able to accommodate extension headers. Doesn't this alter the size of headers.
Please help, cant ...
2
votes
2answers
61 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 ...
4
votes
2answers
2k views
IP addresses from public IP block in my LAN
If I have NAT or PAT applied on edge router, Would it matter if I use IP addresses from public block in my LAN? And how?
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 ...
1
vote
3answers
129 views
Is IP an abstraction
If packets "hop" from network device to network device across networks using MAC addresses, resolved by ARP, does this suggest that IP is essentially an abstraction?
By abstraction, I mean, the ...
0
votes
2answers
193 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
55 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 ...
2
votes
1answer
95 views
Using an Ethernet cable and USB Ethernet adapter at the same time?
What would happen on using an Ethernet cable connected to one network and
then plugging in another Ethernet cable but using an USB Ethernet adapter from a
different network.
Would it connect to both ...
1
vote
1answer
27 views
How do devices with static IP behave themselves when plugged to a new network? [closed]
I'm trying to understand how to determine if a device plugged to my PC with Ethernet cable has a static IP.
What I'm trying to do is to sniff DHCP packets that it sends and by looking at DHCPDISCOVER ...
0
votes
0answers
18 views
IP SLA Flow generator (udp-jitter)
I study IP SLA because i want to test my network for VoIP. I found an article who show a study of " Scalability of Layer 3 Tunneling Protocols: Case of Voice Traffic Over IP".
"Based on this project ...
2
votes
2answers
54 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
165 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'...
1
vote
2answers
115 views
How does cellular data differ from an ISP, and what can be tracked?
Are IP addresses given to a phone static or not?
Also, how can phone companies keep track of a person if they wanted to find them? For example, I don't have an account and use a pre-paid card.
I'm ...
2
votes
3answers
79 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 ...
3
votes
1answer
87 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 ...
-1
votes
1answer
34 views
why can't we use the sequence number to distinguish them since every packet has a different sequence number? [closed]
It is a question from Networking stanford course.
A server typically listens for TCP connections on a particular port
(e.g. 80 for HTTP or 22 for SSH). Which fields can the server use to
...
0
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0answers
48 views
Which fields can the server use to distinguish packets for a particular client connection? [duplicate]
A server typically listens for TCP connections on a particular port (e.g. 80 for HTTP or 22 for SSH). Which fields can the server use to distinguish packets for a particular client connection?It is a ...
0
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0answers
20 views
Unable to calculate for subnet mask [duplicate]
My question is - To divide a class C network into a maximum of 14 subnets each capable of having up to 14 hosts, the subnet mask used should be .. what and how ?
