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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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13 views

Networking and IP address [duplicate]

If an Isp is allocated to equal ranges for 64 companies with address 130.192.0.0 what is the subnet mask, and host of the first and last company? If not being able to solve it..I’ve little knowledge ...
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1answer
27 views

Unicast Adjacency Routes Nexus (AM) Cisco Nexus

I have an odd situation. There is static route on my Nexus 7700 that routes anything for specific subnet /24 to a F5 LTM Load Balancer, external VRRP interface 10.x.153.15. As you can see below, ...
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1answer
31 views

Typical signs of fragmented IP fragments

Given, for example, a Wireshark trace, how can I identify that the IP fragments that I am sending are themselves being fragmented? For example, if I'm sending 1500 byte IP fragments, and the server ...
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How to find Header length and total length with 8-bit inputs in IP datagrams [closed]

this is my first time posting here, so i apologize in advance if i do something wrong. Basically, I'm doing a bit of networking homework and i reached a roadblock. I'm unsure about the math that i ...
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1answer
33 views

What layers of the TCP/IP model does an SDN involve?

New to Software-Defined Networks. I know that an SDN involves an Application plane, a control plane and infrastructure plane. By definition, I know that the application plane is in the Application ...
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16 views

Changing default gateway IP address from a failing switch to a VRRP configuration using failing switch plus two others

I have an HP 5406 switch that has been the default gateway for years. This switch is beginning to fail but still has customers Ethernet and Fiber on it. Everyone on my network, 800 or so devices all ...
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1answer
18 views

Question on windowing and determing connection speed

Hi i'm just learning computer networks and i have learned about windowing in tcp And my question is does we determine connection speed using windowing? I mean computer know the number of packets and ...
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20 views

my question is about How to Subnet my network of 2 routers 1 switch (2vlans) and 2 laptops? [duplicate]

Loopback1---R1-------z--------R2---L2 | | | | |______S1_________| || ...
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2answers
94 views

In IP, to what extent are the network addresses coordinates?

Routing of data relies on being able to reach the destination address. There are network addressing systems proposed where the addresses are coordinates, Vivaldi from MIT, for example. The routing in ...
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1answer
92 views

How does NAT ensure that every machine has a unique public IP?

I am trying to understand the distinction between public and private IP addresses in IPv4 networking. The picture I've been told has some problems with it, so I would like to present it here and ask ...
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0answers
14 views

Some client can not able to get IP address [closed]

I get a new ASUS Router I have configured it as wireless router mode with IP address: 192.168.1.253 and disabled its DHCP server because there is a DHCP server with address: 192.168.1.1. Now some ...
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32 views

Can you use the first and last subnet in IPv4? [duplicate]

I know you can't use the first and last address -in- a subnet. (I.E. 192.168.1.0 or 192.168.1.255) but there is some amount of disagreement in my Networking 1 class whether or not you can use the ...
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1answer
27 views

When IP header of length 22bytes is there then how padding will work?

My base IPv4 header of 20bytes + 2bytes i used for Options making it 22bytes means 176bits so padding will add 16 Zeroes to make it multiple of 32? is this correct way to understand? Boundary of ...
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1answer
116 views

How to Run Static IP Through Comcast Business Class Modem to Router?

I apologize in advance for this kind of nebulous question, but I'm very stuck after many hours of trying and I need help. Here's what I have: Newest model of the Comcast Business Class Modem/Router ...
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0answers
39 views

Why can I ping 10.10.10.140 from 192.168.1.15? [closed]

I'm on a 192.168.1.0/24 subnet, and when I ping 192.168.1.137 I get a response saying the host is unavailable (as expected because I don't have any machines using that address) However, when I ping ...
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1answer
50 views

How data travel from a node to a destination IP address? [duplicate]

Let's say I have a lot of devices which connect to a single switch, and the switch itself connects to a router which provide Internet connection. Whenever an application on a node needs to ...
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1answer
25 views

Why we need Mac address to send Packets? [duplicate]

While sending a packet network layer attach the source and destination Ip addresses to it. But Data link layer need a destination Mac address in order to send the data through router or within a ...
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2answers
65 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 ...
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1answer
31 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 ...
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2answers
56 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
89 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 ...
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60 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 ...
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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 ...
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2answers
698 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 ...
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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 ...
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103 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 ...
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1answer
56 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 ...
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3answers
98 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 ...
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1answer
136 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 ...
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3answers
136 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 ...
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1answer
45 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 ...
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2answers
78 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 ...
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1answer
250 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 ...
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1answer
79 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 ...
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1answer
21 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 ...
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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 ...
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1answer
37 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 ...
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1answer
113 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 ...
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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 ...
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1answer
47 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 ...
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1answer
58 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 ...
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3answers
108 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 ...
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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 ...
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1answer
32 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 ...
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3answers
75 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 ...
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2answers
72 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 ...
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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?
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1answer
32 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 ...
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3answers
147 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 ...
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2answers
344 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 ...