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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46 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 ...
4
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3answers
78 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 ...
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2answers
87 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 ?...
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1answer
60 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
135 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
58 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
63 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 ...
2
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1answer
30 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 ...
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2answers
66 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 ...
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1answer
82 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?
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3answers
17k views

What is Link-local addressing?

I noticed that IPv4 reserved 169.254.0.0/16 and IPv6 reserved fe80::/10 for link-local addressing. While I saw IPv6 uses both fe80::/10 address and my private IPv6 address fd00::12 to communicate with ...
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1answer
87 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 ...
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2answers
445 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....
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1answer
806 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
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1answer
54 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 ...
7
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2answers
811 views

NAT Overlapping

I am trying to do some networking lab. Basically, I have a network like this: So, is it possible to configure NAT router in such way, that PC1 and PC2 can access remote HOST and each other. The ...
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2answers
151 views

calculating a range between wireless camera and phone?

I want to connect wireless camera to a local network. The wireless camera's range in line of sight is 100 meter. if i'm creating a local network using my phone (hotspot) which gives range 30 meter ...
19
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2answers
8k views

Is multicast on the public internet possible? And if yes: How?

Is it possible to use multicast on the public internet? If yes: How? Are special IP addresses required and where do you get them from?
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1answer
63 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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1answer
36 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. ...
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2answers
426 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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1answer
50 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 ...
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4answers
18k views

Check all the active IP addresses on a switch

I have a small LAN network. Each table has a switch, and the laptops are connected to that switch. There is a host which is using a large amount of the Internet bandwidth, and I would like to find ...
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2answers
164 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 ...
3
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2answers
2k views

How does computer in IPv4 network communicate with computer in IPv6 network

I have a Verizon cell modem that uses IPv6 addressing only. I can use it to access IPv4 addresses, like browsing the Internet. However, if I try to ping this IPv6 address on a cell modem from IPv4 ...
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2answers
356 views

Does host really resolve end Host IP or Gateway?

Assume I have following connections: [HostA] - - - - R1---- Internet - - - - R2---- [HostB] Now, I want to communicate from HostA to HostB, Does HostA really resolve the HostB IP address, or if it ...
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4answers
1k 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. ...
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2answers
378 views

Public IPv4 Subnetting Clarification

I've been delving into the wonderful word of networking (lol) and I have a few questions of clarification for IPv4 subnetting. I'm pretty comfortable with the idea of subnetting. I understand that it'...
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2answers
107 views

CRC done by ICMP?

Is cyclic redundancy check (CRC) done by Internet Control Message Protocol(ICMP)? How can Time to live (TTL) help for this?
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3answers
9k views

Is a TCP three-way handshake required for an HTTP POST?

I don't quite understand if i posting http form data from the browser to the server, does the protocol still need to make three-way handshake (syn-ack-data) or it only works for GET http requests?
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3answers
7k views

What do TCP/UDP add to “raw ip”?

I know that both TCP and UDP are built on top of IP, and I know the differences between TCP & UDP, but I'm confused about what exactly "raw ip" is. Would it be fair to say that TCP & UDP both ...
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1answer
191 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
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1answer
188 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 ...
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1answer
63 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
101 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 ...
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1answer
66 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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2answers
753 views

Why do open ports give no response in networking?

Nmap places ports in open|filtered state when it is unable to determine whether a port is open or filtered. This occurs for scan types in which open ports give no response. The lack of response could ...
7
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2answers
5k views

Is it true that the fd00::/8 address range (ULA) in ipv6 is for machines that you NEVER want to speak with anything on the Internet?

Is it true that the fd00::/8 address space (User Local Addresses) in ipv6 is for machines that you NEVER want to speak with anything on the Internet? I was just reading that here and rather surprised ...
0
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1answer
91 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 ...
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2answers
318 views
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2answers
4k views

Assign public IP of /29 block directly to a connected device in pfSense

Ultimately what I want to do is connect a second physically separate gateway, and assign its WAN port one of the public IP addresses given by our ISP. So I have the following setup currently and is ...
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3answers
1k views

Where can I use the IPv6 documentation prefix

We are currently building a networking course with a practical part where students have to configure a small network in a virtual environment. However, we are not sure what ipv6 prefixes we can use ...
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3answers
13k views

Calculate subnet mask from IP Address

I have an IP address 12.23.34.22 I need to find the network prefix for this IP Address. For that I need to find the subnet mask and then count the number of contiguous 1s to get the network prefix. ...
2
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1answer
93 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 ...
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3answers
2k views

How do VPN's forward network traffic? (Layer 3)

I am looking for some info on how VPN's (Virtual Private Network) forward network traffic through its VPS (Virtual Private Server). Take an example where you are connected to a VPN. You make a ...
2
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1answer
82 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 ...
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1answer
64 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
98 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 ...
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1answer
71 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 ...
2
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2answers
55 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 ...