Questions tagged [networking]

For questions about networking in general. Any question about all on topic network devices can use this tag.

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How do i create 12 subnets of different sizes with the ip address of 192.168.10.0 [duplicate]

You were requested to provide subnet masks to meet the requirements (12 subnetworks) as below. What subnet mask do you require for each subnet type? Q2: What subnet mask is required as minimum to ...
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Squid: deny login for users from a certain port [closed]

I have a pretty basic squid configuration on a Linux machine where Squid listens to multiple ports, I want to change my config so that each port has it's own user and other users can't log in. This ...
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Can people with an ISP access your network if it is on the Default Free Zone?

Let's say you have a router on the DFZ (despite costing an absurd ammount of money). Would your network work the same as if you have an ISP in terms of web hosting, etc? Can people still access your ...
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Whether PPTP Client need virtual interface to communicate with PPTP Server? [closed]

We know in PPTP VPN, the VPN Server is using a virtual Interface to provide encrypted data. Whether PPTP Client need virtual interface to communicate with PPTP Server? and more, if yes, whether ...
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Can use virtual port as the port mirroring's destination port?

Port mirroring can mirror several source port to a destination port(mirroring port). I have several questions about port mirroring. in the dest port, how to differentiate the different source port? ...
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1answer
20 views

filling routing table with next hop addresses

in a multi hop network when the packet leaves the source is it loaded with all the ips of the stops on its journey, then at each hop it checks the bitmask with the nodes routing table to see if this ...
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Help Understanding the Network+ [closed]

Hey I'm attempting to write the Network+ exam to get the qualification behind my name. I am however struggling to understand the questions it's not the knowledge that's the problem as I've been in I.T....
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Can I install a LAN switch between two WiFi routers? [closed]

I am new to this, so please bear with me. My problem concerns limitations with my ISP and my home WiFi network setup. Here is a diagram: (1) My ISP will only allow one (1) LAN port on their router (...
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Understanding subnetting [closed]

I understand how subnetting works but i don't understand how it fits in my everyday life. I have few questions 1.does only ISP's subnet networks or even private ips are subnetted ? 2. If my public ip ...
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1answer
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Some questions about a DMZ and where to place my web servers? [duplicate]

Currently i build a new network for our company which is not my specialism as i'm actually a software engineer so excuse me when this is a stupid question. I read a lot about networking last few ...
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Vlan vs. Subnet Broadcast Domain

It is my understanding that Vlans separate broadcast domains, but I often see people say, "subnets define a broadcast domain" as well. Is it correct to say, "Vlans define a L2 broadcast domain, and ...
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Creating two network with two routers that cannot talk to each other [closed]

So I setup my home Network like this: 1- Is this setup is enough to isolate the smart devices from reaching the devices connected to the router 2 ? 2- I setup the DHCP range on the router 1 like in ...
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Firewall placement

Ok, so I'm confused on the placement of firewalls, most diagrams I come across are as follows: ISP > router > firewall However, I'm confused about this, surely you would want a firewall before the ...
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Internet issue with home network [closed]

I have a home network and the internet seems to be dropping every few weeks. I have a Fortigate 30E firewall and 2 access point one Meraki and one Ubiquiti. The firewall is connected WAN port by my ...
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2answers
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Best way to make a network failsafe?

I have a Debian based machine with 2 completely different network interfaces from 2 different ISPs acting as a backup for my server connection. These have two different IPs (Let's say IP1 and ...
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1answer
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Understanding IP scheme, distribution and usage [duplicate]

I'm new to networking and I'm doing my best to understand how things work. I do have a problem in understanding IP scheme idea (even though obsolete), more specifically, their structure, distribution ...
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Why can't i reach devices in the other network?

I have 2 networks and want to connect them with each other. It should be possible that all devices in network A can communicate with devices on network B and other way round. 1 network is "managed" by ...
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1answer
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Additional subnets in a class C IP [duplicate]

If i'm designing a new subnet mask for a class C IP that will have 5 subnets that means I need to borrow 3 digits since 2^3-2 > 5. My question is, how many additional subnets do we have? would it be ...
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2answers
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Will TCP packets smaller than the full bandwidth of its link travel at the same speed?

If I send 5bytes over a 1mbps connection will that travel faster than 500bytes. Or is the latency after propagation going to be constant since the packet is under 1mb? If you downvote because you ...
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2answers
55 views

Why cant i reach the other network while i have added the routes and firewall rules to allow traffic? (Pfsense/USG200)

I have 2 networks, the current one and the new one. The current one is not configured by me and one big mess and contains heavily out dated hardware (especially servers). I want to be able to access ...
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3answers
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Are there any alternative devices to routers?

I am not talking about the router used at home to access Internet . I am talking about devices used in the network core. I want to know if there are alternative devices, if any, used for forwarding ...
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Encapsulation: can a higher protocol encapsulate a lower protocol?

I've heard someone say that a protocol higher up the osi model can encapsulate a lower protocol. As far as I know, personally, a protocol can only encapsulate a same-level protocol or one at a ...
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2answers
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Who owns the in between routers displayed when I execute a traceroute command?

When i traceroute a website, i get the IPs of all the routers in the path between me and the website. Who owns all those routers? Are they organized in a particular kind of building?
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Fat-Tree topology

Fat tree network topology looks like a tree topology like below figure. In tree topology, we have same terminologies like Root, parent, child etc. This is mainly used to connect a large number of ...
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How many times is the data packet copied before finally reaching the NIC? [closed]

On a typical linux machine, how many times would packets be copied from the application layer to all the way in its journey to the network card. I am assuming the protocol being used here is TCP/IP ...
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2answers
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Which is the best way to encrypt all the IP traffic in LAN?

I'm trying to encrypt all the IP traffic in a small LAN network but the in that network all kind of devices are connected i.e. PCs, Laptops, IP Cameras, IP Sensors, etc (new and old devices). I have ...
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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?
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Why does the sender assume that packet n is lost if it receives 3 back to back ACKs of packet n-1? [duplicate]

I came across an unjustified statement in my study notes regarding TCP: If sender receives 3 duplicate ACKS back-to-back, it assumes that the next packet in sequence was lost, and re-transmits. ...
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1answer
38 views

why the size of a frame is dependent on the data that is being sent in the payload of the frame

I'm new to networking, just a question on frame size. I was reading a book which says: An interesting characteristic of character/byte stuffing, is that the size of a frame is dependent on the data ...
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1answer
39 views

Create IPSEC VPN between three Routers?

I'm attempt to build essentially an IPSEC tunnel mesh between three Cisco IOSv routers. I've been able to build an IPSEC tunnel between two directly connected routers but once I add the third router ...
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1answer
26 views

Getting network traffic of a remote IP? [closed]

(Not sure if this is the right place to ask) I want to get the network traffic and packets of an IP outside of my network from IP. For example, I can sniff my own network using Wireshark. Just like ...
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2answers
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Fiber dBm transceiver power level at warning

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following. Question: what is the normal power level for ...
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1answer
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Why there is a statement of FIN packet is easy to discard in the networking?

In Nmap port scan there is a Covert scanning which use FIN for scanning, but it is not accurate, because the FIN packet easy be discard in transmission. Why there is a statement of FIN packet is ...
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3answers
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setting up a VLAN and joining 2 buildings through underground cabling

I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd. So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
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1answer
43 views

Which of TCP flags will use a timer, and what Timer will use?

When I study the TCP protocol life cycle, There are 3 stages: Establish Connection Data Transmission Connection Removal TCP have 6 Flag types: SYN, ACK, PSH, FIN, RST, URG. TCP has 4 Timer: ...
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1answer
70 views

Switch doesn't learn MAC of a connected device

I am new to networks. What does it mean when a switch doesn't learn the MAC address of the connected device? And how can VLANs can impact that?
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Switch Operation Beyond VLAN Segmentation

What are the other operations performed by a switch which are outside the VLAN's boundaries. Is Logical (VLAN) Segregation is exactly same as breaking a switching network physically via a Router?
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3answers
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Can two or more computers that are physically close together form a connection/network without a router? If they can, how do they do so?

So, I am pretty familiar with things when a router is used. To my knowledge, packets travel from Computer A to the router, then the router directs it to Computer B. Problem solved. I get confused when ...
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1answer
58 views

How Many Extension Headers Can an IPv6 Packet Have?

How many next-header extensions can an IPv6 packet contain? I read here that it can contains: None, one, or more. which isn't very informative. Below is a reference to an IPv6 packet I'm looking ...
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1answer
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Will arp table on the host (linux) will refresh after no of failure?

Let say I have a remote hostA and remote hostB. Initially hostA has an IP address of ADDR1 and hostB has an IP address of ADDR2. Now clientA made a successful connection with hostA using ADDR1. ...
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1answer
52 views

How my neighbour machines in the same network knows my interface ip?

In my local machine if I set the IP address to an interface, how other machines know this and route the packets to me if anyone tries to send packets to my new IP? I am in a private network.
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2answers
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What my traceroute only list one hop?

This is my topology in my network. It's easy to know my server can communicate to 172.18.32.254/24. But when I traceroute the path, I only get one hop to it. My doubt is why it do not through 102....
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How to understand the `Flow` and `Dynamic Flow` in networking?

In networking we also hear about Flow and Dynamic Flow. such as in there, there has the dynamic flow term. How to understand flow and dynamic flow? is there any difference between them? EDIT-01 ...
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45 views

What's the inline monitoring?

What's the inline monitoring? I searched wikipedia and google but do not find the meaning of inline monitoring for network. who can tell me the definition of it? I can get the definition of passive ...
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How does direct sequence n-bit chipping code recover bit in the event of interference?

Say for example my data stream was 1010.Using 4-bit chipping code, with a random sequence of 0100101101011001. The XOR'd data which the receiver receives is 1011101110101001. I understand that ...
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3answers
67 views

What's an uplink port? Is it a port that simply uses Auto-MDIX?

Uplink port is used so there is no need for crossover cable, right? Does it use Auto-MDIX or is it an entirely different thing? if so what's the difference? please help :(
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1answer
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Does a PC have a MAC address table?

I have a network topology like this: We know switch has MAC address table, but does the PC have MAC address table? I know PC have ARP table in Windows I can use arp -a display all the arp information ...
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1answer
69 views

How is the MD5 hash calculated in BGP?

The RFC is very superficial on the implementation details. What is the injective function being used? https://tools.ietf.org/html/rfc2385 MD5 digest is produced by applying the MD5 algorithm to ...
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1answer
30 views

What is the difference in packet structure for tag VLAN and port VLAN

I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
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4answers
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P2P Connections

Hey there I am a noob in the field of networking and I have a confusion: What is the difference between point-to-point and end-to-end connection ?

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