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.
871
questions
2
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3answers
205 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.
...
1
vote
1answer
67 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 + ...
0
votes
0answers
7 views
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....
0
votes
1answer
76 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 ...
0
votes
1answer
48 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 ...
12
votes
3answers
4k views
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 ...
0
votes
1answer
37 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 ...
1
vote
4answers
96 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 ...
1
vote
3answers
470 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 ...
0
votes
1answer
46 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 ...
0
votes
1answer
46 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 ...
-1
votes
3answers
1k 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 ...
1
vote
0answers
140 views
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 ...
0
votes
1answer
26 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 ...
0
votes
0answers
13 views
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?...
3
votes
1answer
76 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 ...
0
votes
1answer
29 views
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?
0
votes
1answer
34 views
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 ...
-1
votes
1answer
114 views
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
0
votes
3answers
249 views
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 ...
1
vote
1answer
103 views
Why is an IPv6 interface required to have a link-local address?
According to Link-local address on Wikipedia:
In IPv4, link-local addresses are normally only used when no external, stateful mechanism of address configuration exists, such as the Dynamic Host ...
0
votes
2answers
36 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.
...
-2
votes
1answer
32 views
How UDP protocol Number is 0x011?
How UDP protocol number is 0x11 when it's supposed to be 0x17 According to ianna website
1
vote
4answers
154 views
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 ...
0
votes
2answers
36 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 ...
0
votes
1answer
80 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 ...
0
votes
2answers
45 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 ...
0
votes
1answer
81 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 ...
0
votes
1answer
46 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.
1
vote
2answers
434 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 ...
0
votes
2answers
125 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 ...
0
votes
1answer
26 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 ...
2
votes
2answers
287 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?
1
vote
1answer
147 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 ...
0
votes
2answers
40 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 ...
0
votes
3answers
84 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 ...
0
votes
0answers
15 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 ...
1
vote
0answers
48 views
In Bgp TTL security all control packets will have configured hop value?
Topology:
loop(2.1.1.1) - routerA (192.168.1.2)--------- (192.168.1.1) routerB - loop(1.1.1.1)
I have eBGP peering configured with a Multihop of 2 on both sides and static routes to reach loopbacks.
...
1
vote
1answer
88 views
Extract upstream/downstream ASNs from BGP table path
I want to extract upstream and downstream ASN for any given ASN, for example:
https://www.cidr-report.org/cgi-bin/as-report?as=AS4826&view=2.0
My goal at the end is to generate ASN route graphic ...
0
votes
1answer
21 views
Length of Version field in IP Datagram header
I have doubt regarding length of "version" field in IP datagram. I have read the possible values are either 4 or 6 but they can represented in binary as 100 and 110, which are 3 bits in length. Then ...
0
votes
1answer
91 views
What steps must be accomplished in each layer of the TCP/IP model to connect a website?
What steps must be accomplished in each layer of the TCP/IP model to connect a website?
24
votes
3answers
6k views
Will IPv6 make private IP addresses become obsolete?
Will it still be useful to make use of private IP addresses with IPv6?
0
votes
0answers
36 views
Locating where an IP address lives
Without documentation or using console how can I locate a particular IP within my network? Specific issue is I have public IP sitting on a device at a datacenter. The IP address appears to be going ...
0
votes
0answers
10 views
Find device hosting server on the same network without knowing the local IP [duplicate]
I am developing a Java app that hosts a socket server. This server will exchange information with a mobile app connected on the same WiFi network.
I am trying to create a seamless experience that ...
1
vote
0answers
41 views
If a server has both IPv4 and IPv6 addresses, how does the DNS determine which to return? See the following example [closed]
These Pings were done at different times of the same day:
C:\Users\LPress>ping www.ucla.edu
Pinging gateway.lb.it.ucla.edu [164.67.228.152] with 32 bytes of data:
C:\Users\LPress>ping www.ucla.edu
...
2
votes
1answer
92 views
IPv6 SLAAC and Static DAD
I started learning about IPv6 and I wonder what happens when you mix SLAAC and static addresses in the same /64.
My current understanding is as follows:
Machine A with a statically configured ...
0
votes
2answers
52 views
How can I use 1 static public IP address for multiple private networks in totally different physcical locations?
So, I know that DNS is important in the running of CDN services. DNS allows the routing client traffic to the physically nearest CDN server. Question is, how can I do the same thing without any DNS ...
0
votes
1answer
53 views
Does Internet Stream Protocol (IP version 5) work on the Internet?
IP with version number 5 is dedicated to the Internet Stream Protocol. Can you send such a packet on the internet at large, or will it be blocked/discarded?
1
vote
2answers
37 views
What is the suitable private IP? [duplicate]
What is the private IP that I may use if I am about to subnet a total of 743 hosts in my office? Should I use 10.x.x.x, 172.16.0.0 - 172.31.x.x, 192.168.x.x or all of them are allowed? Also if more ...
16
votes
3answers
3k views
Is it possible to specify a route for a packet to take?
So, AFAIK, packets "hop" between routers. Packets are forwarded via a router's default path until it gets to destination IP. So is it possible to specify a specific set of routers this packet "hops" ...
