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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12 views

How many IP packets are sent for a smartphone image?

Problem Let's say, my image file has a size of 2 megabytes. It is sent over TCP/IP/Ethernet. I want to know roughly how many IP packets are sent. The purpose of this example is to get better intuition/...
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1answer
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No default gateway on windows 10. How to find my router's IP using ethernet? [closed]

When trying to connect to the internet using my router, as I always have, I am getting connected, no internet. ipconfig shows ethernet adapter 1 (which is the correct one) has no default gateway. This ...
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0answers
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What kind of way does a website have to detect a “banned” computer? [closed]

I've noticed at least one web service that is able to detect a user that was previously banned from using the website, even though all the user is required to do in order to open a new accounts is to ...
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First 27 packets are lost in ping [closed]

If ping initiated from cloud server to destination server with jumbo frames(say example 8000 MTU), always first 27 packets lost and start getting reply from 28th packet. What could be the reason
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multiple-NAT environment and DDNS service cannot work [closed]

in past i was able to make change to my router from outside my home network (using the public ip). Now is not working any more, i did not make any type of changes to the router. Lookin the router i ...
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1answer
27 views

How to connect to a machine which is sitting behind NAT router?

I have a server that needs to push a message to a client from which it received a request a few days ago. Now request which was received has the IP address of the NAT router behind which the client ...
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2answers
399 views

Safe to remove ip default-gateway?

We recently changed IP schemes from 192.168.x.x to 10.x.x.x In doing so, I noticed that the prior network engineer had ip default-gateway in the configuration pointing to an old default gateway that ...
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2answers
376 views

Is not 192.168.88.1 (192.168.*.*) always an “internal” IP address?

I had some headache with a proxy setup which I couldn't figure out. Turns out that only "127.0.0.1" and "localhost" were recognized as "localhost" or "internal" ...
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1answer
55 views

what is happening when a host receives a datagram with its MAC address as a destination but different destination IP

In a specific network say the host receives this datagram what is happening ?
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How do I determine an IP prefix? [duplicate]

I know barely nothing about computer networks. I am currently porting some windows code to linux, using .NET core. Some parts have not been implemented for linux, and determining an IP prefix is one ...
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2answers
45 views

How does a device get a response from a HTTP request without an open port on the router?

I don't know much about how TCP/IP works, so please bear with me here. I was wondering how, when your computer makes an HTTP request from a random port(on that device) to port 80 on a server, it gets ...
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1answer
23 views

Are there broadcast/collision domains on non-Ethernet networks?

What if we have routers or hosts connected via ATM, Frame Relay, or SONET; that is, what if we have IP over SONET, IP over ATM, IP over Frame Relay, etc., do we still have broadcast domains and ...
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What is the best way to match packets across pcap files from different capture points? [closed]

I have multiple pcap files which contain data from different capture points in the network. Previously I thought that by using the IP-ID field I can match the packets across the capture files but I ...
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3answers
163 views

Testing Secondary Static Route

I am in the middle of migrating to a new IP scheme. From 192.168.10.x/23 to 10.6.x.x/19. Our ISP handles layer 3 and we statically route from our L2/L3 Cisco 3750G switch stack to their L3 device. ...
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1answer
42 views

how data are fragmented based on MTU and MSS?

just to be clear.. if a sender wants to send a data of 1800bytes ( assuming MTU be 1500bytes so MSS = 1500-40 (taking min ip and tcp header) = 1460bytes) Then there will be three segments 750 + 750 + ...
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network question [duplicate]

can someone please explain this question and answer Based on networks 10.8.16.0/22 and 10.8.31.0/21, which of the following is the BEST summarized CIDR notation? A. 10.8.0.0/16 B. 10.8.0.0/19 C. 10.8....
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1answer
31 views

What flow control mechanism does ethernet uses?

Datalink layer is basically responsible for 3 major functions - Error detection/correction - CRC is used by ethernet Collision detection - CSMA/CD is used by ethernet But I couldn't find what flow ...
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1answer
43 views

What if receiver changes its IP address during the transmission process?

Suppose I am sending data to a laptop with IP address say x but before data could reach its destination the laptop is moved to another network and now its IP address becomes Y. Will the receiver still ...
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3answers
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Why isn't multicasting more popular?

Multicasting seems provide an efficient method of routing networking traffic from a source to multiple end users, especially at this moment in time with teleconferencing, streaming media, online ...
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1answer
28 views

IP datagram route through a network utilizing ARP

Suppose I want to send an IP datagram from node D to node C . Each step I also want to list the MAC addresses of the source and the destination , as well as the source and the destination of the IP ...
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4answers
85 views

How common it is to see unknown IPs in logs?

I have a server that streams video to YouTube/Twitch. I see [UFW BLOCK] entries in logs. One IP is 220.133.236.166, the other is 194.26.25.8. Is it a common thing that a server is connecting to my ...
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3answers
319 views

Routing between completely separate private networks

I’ve got a request from a partner vendor in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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1answer
36 views

Ethernet Frame visualization

One IP packet is fragmented in multiple ethernet frames at sender's side And at receiver's end, all the frames are combined to get back the IP packet So is there any way to see what payload each ...
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1answer
38 views

Can a device with static native IP communicate with another device getting IP from DHCP

I have a device with a native IP : 192.168.0.1 - 255.255.255.0 I would like to know if it is possible for my computer to join this network using my router set to give ip address from 192.168.0.2 to ...
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3answers
121 views

Confusion about TTL when pinging

TTL value of a packet is supposed to decrease 1 at each router from 255 down to zero as follows: But when I ping to 8.8.8.8 the TTL starts at 253 and doesn't change: How can this be explained? Why ...
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How to find which protocol is used by lower layers? [duplicate]

When we type https://stackoverflow.com/ all the data which is sent to this server would be using HTTPS protocol in transport level So is it possible for me to know which error detection, flow control ...
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Cisco ASA 5506: Adding two public IP's that are on the same subnet for the primary and backup interface

Im programming a Cisco ASA 5506. I need to add a primary (public) IP that is x.x.x.82/24 and a backup IP that is x.x.x.81/24. The ASA wont allow me to do this as it gives me an error: "the IP ...
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1answer
25 views

Connecting to device which requires specific IP [closed]

[Disclaimer: I'm a complete networking novice, and this question might not even be well suited for this site. I welcome pointers to other stack exchanges if appropriate.] I'm trying to connect a ...
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How to select CIDR blocks when subdividing a network? [duplicate]

I saw these two questions, but they are still too over my head and start too far along the path: How to divide network into subnets? How do you calculate the prefix, network, subnet, and host numbers?...
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1answer
66 views

What are usecases for IPv6 link-scope anycast?

IPv6 Neighbor Advertisement messages have a flag called Override, see RFC4861. It toggles, whether the receiver of the message should remove other link-layer addresses for the same IPv6 target address ...
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1answer
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What are some techniques to infer the subnet being used? [closed]

Given a list of thousands of IPv4 addresses and that you have no direct access to these hosts, is there a service or a methodology to infer a subnet that's possibly being used?
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1answer
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BGP - Active\Passive Setup, except one AS

I have two transit providers, A and B. The business has chosen to make provider A more attractive due to billing concerns (we get attractive bulk pricing from this global provider). This was done by ...
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1answer
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different network mask and subnet mask and netmask [duplicate]

1- what is network mask? 2- what is subnet mask? is there any differnt between network mask and subnet mask? i'm tried to search about network mask and nothing found is it called netmask ? thank you
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32 bits or 30 bits for subnet mask

I'm new to networking and have a question about subnet masks. Imagine we have a class B IP address. I know how to calculate the subnet mask. My question is: What is the last subnet mask that we can ...
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2answers
33 views

Is it possible to completely mask an IP address to a point where no IP address can be detected yet an active connection is live?

I’ll keep it short and sweet; We all know to connect to internet you’ll need an address like 2001:x** or 192.x**. Using a vpn, while it does encrypt things and mask your IP, it still returns an IP. ...
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1answer
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How UDP protocol Number is 0x011?

How UDP protocol number is 0x11 when it's supposed to be 0x17 According to ianna website
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4answers
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Assigning IP addresses to multiple switches

Thank you in advance for taking the time to read my question, i appreciate it. I am in need of help on IP assigning to 4 brand NEW Araknis switches that I am replacing with the current netgear/tp-link ...
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2answers
32 views

multicast udp streaming dst and src address assignment

If I am streaming on a host using the internet outside my nat, how is multcast addressing work with respect to streaming for example, if the application outside sends to 224.0.0.1 how is the packet ...
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1answer
61 views

Extra IPv6 Addresses - where are they coming from? [closed]

I recently got assigned a block of IPv6 addresses by my ISP. I've set it up with prefix delegation and it works just fine. When I plug a NIC in on the network it quickly picks up an IPv4 address from ...
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2answers
31 views

Can a Subnet have more than one CIDR range?

For many years I thought of a subnet as a single contiguous range of ip addresses expressed using CIDR notation. However on GCP a subnet can have a primary ip address range from which VMs get ...
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1answer
48 views

IPs that cannot be used

I'm new to networking. I know that some IPs cannot be used and we cannot consider them when dedicating an IP. I know some of them such as: Net ID Addresses Loopback IP Addresses Broadcast IP ...
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1answer
33 views

IPs that don't have subnet mask

I'm new to networking. I know that some IPs don't have a sub net mask like 127.0.0.1 and the range that starts with 127. I wanted to know if there is any other IPs that don't have sub net mask.
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289 views

Prevent TCP sequence prediction attack

Let's say an attacker gets the sequence number between me and my client. Now he continues the conversation with me and has changed the IP address. How do I prevent packages from being sent to ...
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2answers
42 views

Modify the IP in TCP/IP packet

My ip address is specified in the ip packet sent to the next node. I wonder if a device that handles this packet can modify the ip address before forwarding it to the final destination? In theory ...
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1answer
24 views

Why we use IP address in sockets? [closed]

When a server want to create a socket, it will use a combination of its IP address and some well-known port, let us say 80. So, when a segment arrived, both the server IP and port 80 will be used to ...
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2answers
101 views

What Does a Private IPV6 address look Like?

I'm doing a presentation on how the internet works, and I'm wondering if there is even such a thing as a private IPV6 address. If so, what does a private IPV6 address looks like?
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1answer
92 views

What is the last usable address in an IPv6 network

IPv6 does not have broadcast, so is the last address usable? Besides it being long, is it bad practice to actually use it? For example: A:B:C:D::0/64 starts with A:B:C:D:0000:0000:0000:0000 and ends ...
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2answers
32 views

why ip protocol use fragment offset instead of index number?

I was wondering why the IP protocol use fragment offset to define the fragments of an IP datagram instead of using index number (first fragment with index 0, second with index 1, ...). We already know ...
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3answers
36 views

Forwarding and routing table for host [duplicate]

I'm new to computer networking and from what I've studied, I've understood that Forwarding tables map MAC addresses to ports. So they are used by switches. Routing tables map IP to IP ..they define ...
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0answers
14 views

VLSM Scheme Approach [duplicate]

I have been asked this question in a Cisco Packet Tracer. It is testing my knowledge of designing and implementing a vlsm addressing scheme. The requirements are: You will subnet the network ...

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