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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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1answer
27 views

How does a router forward datagrams from the internet to an interface of a private network?

As I have seen in How does a router know to which PC in a network to send a response from a server? if I haven't misunderstood it, if an interface in a private network sends a Datagram to the outside ...
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0answers
14 views

What Happen when i ping my own ip? [on hold]

i'm connected to some network and it gives me an IP Address when i try to ping my own ip address it reply back; but i'm confused what exactly happen over there ?
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0answers
15 views

Can't Seem to Resolve Static DNS Issue [on hold]

I am statically configuring IP address, subnet mask, default gateway and primary and secondary DNS servers on my host, which is a Windows 10 PC. Everything is working perfectly except the DNS ...
7
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1answer
200 views

Is the first address of the subnet a valid configurable address in case of IPv4 and IPv6 point to point networks?

Am I correct, that first address of the subnet is a valid addresses to configure in hosts/routers in case of IPv4 and IPv6 point to point networks? For example, in case of 192.0.2.0/31 one of the ...
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1answer
21 views

Is it possible to implement virtual network based on MAC in IP instead of MAC in UDP?

We know that flannel use MAC in UDP to create a overlay network. My question is: UDP header only provides an extra port number fields, let's suppose that one physical machine only run one flanneld ...
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0answers
10 views

Is packet forwarding on the IP layer connection oriented or connection-less? Give a reason! [closed]

Is packet forwarding on the IP layer connection oriented or connectionless? Give a reason!
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2answers
65 views

IPv6 can't ping host when static route configured with exit interface

I have the following topology (using IPv6) interfaces: I have the following static routes configured on it: R1#sh ipv6 route static IPv6 Routing Table - default - 9 entries Codes: C - Connected, L -...
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1answer
23 views

I am trying to set up aDHCP server in a VLAN for practical of networking with Linux

I am a Linux user requesting advice about setting up a DHCP with a VLAN based on offices on one floor for the practical purpose. Is this good enough for implementing a VLAN structure with a DHCP ...
3
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3answers
44 views

Native IPv6 load balancing

We have two software gateways (on Linux) for IPv6 that take fullviews from ISPs and announce our AS. And several nodes connected to Internet via the gateways. Something like at picture: And we ...
2
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2answers
66 views

Public IP addresses

Are all Public addresses connected to each other? Can I ping my friend's public IP address on another side of the world? or public addresses are divided into groups( something like private and public ?...
2
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1answer
36 views

My OSPF Multi Area Topology is not reliable

I made an ospf multi area topology, but it's inconsistent. At times, host from the A area could ping to hosts in other areas however, sometimes otherwise (failed to arrive). Whenever I tried to do a ...
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1answer
51 views

Dividing IPv4 Network into 7 Subnets? [duplicate]

I've been trying to figure out how to divide a network IPv4 IP Address into 7 subnets, where each subnet requires a different number of hosts. For example I have the question: "You are an intern at ...
3
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1answer
29 views

Quagga router advertisement messages are wrong after an address change

I have a problem with Quagga OSPFv3 implementation. I have a Mininet topology with a host connected to a router. I assigned an IPv6 address to the router interface. And I enabled IPv6 ...
3
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1answer
51 views

How can hosting providers give you a dedicated IP adresses?

Some hosting providers give you an option to get a dedicated IP address with your hosting package. For example: Digital Ocean gives every droplet that you create its own dedicated IPv4 address. I can ...
1
vote
1answer
38 views

How does a packet travel across multiple routers/subnets?

After reading various resources and examining the example below, the step-by-step process for a packet to travel the route below is still not 100% clear to me. I'm hoping to get clarification. Image ...
1
vote
1answer
23 views

All routes about a IP in my Router AS-PATH last AS number is Idle

I can not ping the IP 202.137.151.185 from my router. and in my router I show a IP's route, there gets the following information: admin@EE-MX-RE1# run show route 202.137.151.185 ...
2
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2answers
32 views

If the Router's Gig0/0/0 to its Gig0/0/1, whether only cost one TTL value?

I have questions about the TTL value. whether the Router3 Gig0/0/0 to Gig0/0/1, there will cost one TTL? if the Router2 Gig0/0/0 to Router3's Gig0/0/0, will there cost one TTL? or do not cost? if ...
1
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1answer
59 views

How common are low MTU links (<1492) in the public internet?

Are there any kind of statistics how common are low MTU links (MTU is below 1492) in the common Internet?
1
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1answer
44 views

What's the relationship of a Router with its loopback interface in logic?

I have a Router1 with a loopback 0 connected to the Router2: the interface brief is bellow: Router1>show ip interface brief Interface IP-Address OK? Method Status ...
1
vote
2answers
50 views

Why there is only one hop in the tracert?

I use the tracert to a remote server IP address: C:\Users\lll>tracert 103.224.19.11 Track by up to 30 hops The route to f1.FF-SALE.COM [103.224.19.11]:    1 44 ms 44 ms 44 ms f1.FF-SALE.COM [103....
0
votes
1answer
44 views

(CISCO Packet Tracer) Overlap Error

I am trying to set up a network of for different organisational departments based on a given typology: Using Cisco 2911 routers & 2960-24TT Switches. With given addressing of: 'EIGRP 101' 172....
2
votes
1answer
49 views

Subnetting Access Problem

I am learning subnetting, and I am using Packet Tracer to design a network for a building with five storeys. I have used subnetting, with each floor having its own subnet. As a result, it is not ...
0
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1answer
32 views

Communicating with a server connected to wifi network [closed]

I am student currently working on a networking project on java for my college. My college's network uses static IP addressing and all computers connected to network use 10.x.x.x or 172.x.x.x family. ...
0
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1answer
57 views

Why are there IP collisions in my network? [closed]

So I have a switch connected to ethernet cable which has a static IP address configured on it for IPv4 / v6. there are 3 IPv4 static addresses on its subnet. I have 2 Anritsu callboxes connected to ...
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0answers
12 views

Calculate supernet of host and host number based on IP and mask? [duplicate]

So I got the following IP: 192.15.205.7 and the following mask: 255.255.252.0. Now I know that in order to get the supernet of the host I have to use the AND operator between the IP and the mask. In ...
4
votes
1answer
37 views

assign IP address

I have network address with two routers as shown in the picture if the address 12.12.12.1 is reserved as network address and 12.12.12.3 for the broadcast, how can I give the two routers interfaces ...
3
votes
2answers
90 views

How to find the switch IP address based on MAC address?

On PC, the extra network adapter is configured as static 192.168.2.1. A switch with DHCP enabled is connected to 192.168.2.1 and if I login using the console (RS232) I see that it has 169.254.x.x ...
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vote
2answers
49 views

Why Do we consider the serial connection between routers a subnet?

The image attached was included in a question where I was required to design the network f0r the classful network address 172.16.0.0, and it says that each circle represents a subnetwork. My question ...
5
votes
4answers
971 views

Do layer 3 protocols use layer 2 protocols?

I saw the STP on layer 2. The guy that made the tutorial says at the end : Even though it seems that Layer 2 access layer solutions are slowly being replaced by blazing fast Layer 3 solutions. ...
1
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1answer
42 views

Two ip helper for two different services?

There is a vlan5 currently configured with an ip helper-address to forward the broadcast traffic to our DHCP on a different vlan. Works perfectly and everyone is happy. interface Vlan5 description ...
2
votes
1answer
183 views

Is There an Indication in Protocol Stack showing that the End Host is Mobile?

Suppose you are using the Web from your mobile phone. Is there any indication in the internet backbone, when you look at the traffic that shows that the end host is a mobile device? I am sure there ...
1
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1answer
42 views

Why does arp request get broadcast even though it knows the ip address of receiver?

Since the arp request wants to know the Mac address of an ip address which belongs to any one device what's the purpose of sending a broadcast Anyway even though we know only that ip address device ...
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1answer
58 views

How to find which port has a static IP

My colleague set up a static IP on a switch, but didn't tell me where and what port, is there a command to run that will find which port has the static IP set up on.
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1answer
56 views

Can't connect between an IPV6 network and an added IPV4 router

I have a very simple topology, where 4 routers use IPV6 and RIP, there aren't problems and all devices have connectivity. The issue is if I add another router this time using IPV4 for clients. I ...
1
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1answer
53 views

Questions about TCP packets

I am currently in college learning about networks, and I just wanted to make sure that I understood part of the TCP correctly. The question is "What does TCP use to reassemble packets in the correct ...
5
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3answers
430 views

Need help understanding how packets travel across the internet

I've been learning about networks recently at a new job, and I did a presentation on what I've learnt so far. When I was describing the relationship between the datalink and network layer, I mentioned ...
2
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1answer
76 views

TCP connection question

Let’s say I have 4 ethernet interfaces getting IP addresses via DHCP. I make a TCP connection to a TCP server via one of the IP addresses on a certain ethernet interface. After the connection is ...
55
votes
7answers
14k views

Why are IPv4 addresses running out?

I understand that we are running out (or ran out already?) of IPv4 addresses, but I don't really understand why that is. Right now, every home has its own IPv4 address (dynamically assigned, but still,...
2
votes
1answer
62 views

Where does DNS resolution fit within the TCP/IP stack?

I know that it's possible to whitelist/blacklist IP addresses (for example, only allowing a few external IP addresses to be contacted from within a VPN). But since IP address destinations are the ...
1
vote
1answer
29 views

Static Allocation vs Dynamic Allocation [IP Addresses]

Quick question regarding static vs dynamic allocation of IP addresses. I understand that in static IP addressing the address does not change while in dynamic addressing it could differ each time a new ...
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5answers
81 views

Trace the IP address

I have created a web application using Django. While running someone entered the admin login and deleted the users. when checked in the access log of Nginx we found the IP address that actually did ...
1
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1answer
63 views

What hardware do I need to assign IPs based on port?

Similar (but different) question: Assign an IP address based on switch port I regularly need to test our hardware products. Usually that consists of having ~50 devices sitting on a bench for some ...
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2answers
20 views

IP TTL value zero upon receipt [duplicate]

Is it possible that my user-space application using the UNIX sockets API would receive an UDP packet that would have the IP TTL value equal to zero, or is it the case that it always has to be one or ...
1
vote
2answers
49 views

Why are the routes taken by packets random using LPM?

Consider the Longest Prefix Matching (LPM) mechanism that routers use to decide which data link the packet should be sent next. Assuming that the router tables don't change, shouldn't the path the ...
0
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2answers
38 views

Why do we need the protocol and the destination ip info from the 5-tuple to tell the server which application to get the packet?

I learned that in a connection, when the packet arrives at the server, the server will need all the info from the 5-tuple to determine which application will get the package, namely source ip, source ...
4
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6answers
549 views

Why is classful addressing considered waste?

I am trying to understand the addressing strategies. But there is something which I can't grasp. Maybe I am missing a very basic point, if so, I am sorry beforehand. From my researches, let's say, if ...
0
votes
1answer
26 views

Client drops packet from server when SNAT is not enabled at Load Balancer

I understand that one reason we use SNAT on a load balancer for incoming requests is so that the response packet from server will go through the load balancer, where the source IP of returning packet ...
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1answer
24 views

What is the use of Manual IP Settings on Copy Machine which is Connected to Router with DHCP

Today, my company got a new copy machine. During configuration, copy machine guy asked me what IP address we want to use for the copy machine. I said, "I'm gonna reserve 192.168.1.200 in DHCP ...
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votes
1answer
40 views

How are IP addresses assigned? [closed]

1) If I buy a new computer, I haven't connected to the internet yet, don't I have ip address? 2) if I get the ip in one county, IANA gives me the ip depends on my location (first numbers), if I ...
0
votes
1answer
24 views

How to use a remote shell on a machine outside of network

I understand the differences between LAN and WAN addresses. My question is: while outside a network, how do you target a specific machine's address beneath a public IP? Since a public IP for each ...