Questions tagged [network]

For questions about Networking that includes design, and use of a network, the physical cabling, hub, bridge, switch, router, and so forth. Anything in relation to networking and its technologies.

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1answer
39 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?
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2answers
16 views

Speed comparison between agregated and non agregated internet

I have an offer for internet connection, where they offer me these speeds for a symetric and non aggregated connections over fiber optics (upload/download): 10/10 Mbit/s 20/20 Mbit/s 30/30 Mbit/s ...
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How does NIC decide on segment size for smaller TCP segments when tcp segmentation is enabled, assuming NIC supports segmentation? [closed]

Suppose a NIC support TCP segmentation and TCP segmentation offload is set for network interface in linux. How does NIC decide on size of TCP segments it creates from bigger frames received from TCP ...
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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
30 views

ICMP is a protocol working in the Network Layer. Why does it send few fields of the transport layer while reporting an error?

I was confused if ICMP is a network layer protocol why does it send transport layer fields in its error reporting messages.
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4answers
201 views

Can we use two pairs of UTP with hubs?

I understand that hub always supports for half-duplex communication. In that case we should use one out of four UTP pairs. However, I read that for 10BaseT ethernet two pairs of UTP cables are used ...
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1answer
227 views

Can a hub be used for sniffing traffic from a device?

My intention is to analyze all network traffic which is coming to and originating from a network connected device I have. From the configurations of the device I am able to proxy all the HTTP traffic ...
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6answers
3k views

Network latencies between opposite ends of the Earth

This is just out of curiosity. when I pinged domains such as bbc.co.uk and google.com (in California), I get latencies of around 5ms as below: 64 bytes from xx: icmp_seq=0 ttl=55 time=2.940 ms 64 ...
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0answers
13 views

how to know if some one has acess to my computer in a local network [closed]

i home you'r doing well. I'm working in an organisation with a local network, many people have admin privileges (don't ask me why lol). how can i know is some one is using the command ipadresse/...
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1answer
14 views

Why can I forward email without mx record set up properly? [closed]

Say I have a domain domain.com I do not set anything on mx record in domain.com Yet I can set a forwarder from say hello@domain.com to another email. I set a address. Is this normal?
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0answers
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OPC UA Client connection on private WAN [closed]

I am trying to send data through OPC UA using a gateway eWon FLEXY102 with a special 4G sim that enables me to tap into a private network. The OPC UA client is on the remote server and the OPC UA ...
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0answers
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How to make devices on different subnets connect via a main router? [closed]

Alright. The configuration is like that: I have a modem from the ISP connected to a main router A (Linksys-WRT3200AC) All devices, printer, network drive are connected to router “A” LAN or wireless, ...
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1answer
34 views

What environment is still using the Token Ring network?

I have struggled to find what kind of environment (Eg: Educational, Medical environment, etc) where the Token Ring network is still used in this present time and why are they still being used. It is ...
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Finding Subnet and Network addresses [duplicate]

As a Network Support Engineer, you are tasked by your Supervisor with assigning IP addresses for your new MAN( Metropolitan Area Network) which consists of seven (7) different branches, each branch ...
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0answers
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using SNAP/ LLC on ethernet

Why is it not desirable to use Logical Link Control (LLC) and Sub-Network Access Protocol (SNAP) on Ethernet 802.3 frames while carrying IP packets when it is often used for wireless networks?
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2answers
24 views

How could I build a Inner-Net of multiple networks?

I have multiple theoretical(not at the time being) WiFi Networks with one on each property(3 properties) and I want to have the three networks connected similarly to the internet. For example, I would ...
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1answer
29 views

Cisco anyconnect VPN router specific public IP via tunnel

I have fully functional cisco Anyconnect VPN running on Cisco ASA5585-X and today i got requirement that there are some remote public sites we need to whitelist our VPN public IP to access them over ...
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0answers
30 views

How can one detect TLS inspection as a user with an enterprise managed device? [closed]

Let's assume Alice is an employee of the Company Chuck. Alice likes to communicate with Bob, a server somewhere in the internet. Chuck being a security orientated company, inspects all TLS connections ...
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1answer
30 views

RIP always add same network adress

From network 10.10.0.0/23 i made 10 subnetworks. But when i try to add any network address to RIP it always add 10.0.0.0. Router configuration: Router(config-router)#router rip Router(config-...
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2answers
99 views

Can you become your own ISP?

How exactly does an ISP connect you to the vast network of computers which is the internet? In my area there are several ISP's. For example. Bell, Rogers, and Cogeco all connect you to the "same ...
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1answer
47 views

eBGP failover without packet drops

I have core1 and core2 router peer with same ISP but distinct hardware and they are sending us default route. currently all in/out traffic going over to core1 and core2 is idle (standby), I have iBGP ...
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2answers
23 views

Multi LAN network does the main router to the internet need to be in its own subnet?

I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building. My confusion lays in the main router, does it ...
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2answers
64 views

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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3answers
1k views

Fiber between two sites - no signal lights

We need to have fiber connection between two sites (distance less than 300 meters from each other). Currently there is multi-mode fiber connected to old switches working nicely. Now we are updating ...
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0answers
6 views

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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0answers
25 views

Cisco Router Interface Connection Problems

I am new to networking and am configuring, I am trying to setup my connections in packet tracers for 3 different routers to talk to each other over Serial ports as attached. However, I did notice ...
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2answers
603 views

Confused about the results from the cable tester

A little bit of backstory, just in case you want some context. In the last couple of weeks the network at least internally has slowed down. As far as I can tell the only things that have changed has ...
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1answer
16 views

What role Wifi Password play in the connection with the AP?

I was trying to study about how my device connect to the AP via Wifi. I saw many concepts like WPA,WPA2,MIC, 4 Way Handshake and much more. I studied all of them but I still cant understand where in ...
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2answers
82 views

Why is symmetric NAT called “symmetric”?

After searching a while, I'm still not able to find a logical explanation on why it is called symmetric NAT. Where lies the link between symmetric NAT and that each request is mapped to a unique ...
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2answers
92 views

Cisco nexus CRC error on interface

I have dual stack vPC setup between 4 cisco nexus switch as per above design. I have noticed recently that getting CRC error on cisco 3064 all 4 interface connected to N9K, and during peak traffic ...
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1answer
120 views

Copper or Glass for Low Latency?

I'd like to preface the main content of this post with the following: I understand this question may be equally suited to the Physics Stack Exchange, and so I have posted on there as well, but maybe a ...
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0answers
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Comparing ETX with PRR with retransmissions

Expected number of transmissions (ETX) and packet reception ratio (PRR) are two routing metrics that exist. Based on my understanding, the packet reception ratio reflects the link quality. If you ...
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1answer
22 views

LAG links between access switch and stacked switches

When an access switch is connected to two stacked switches through two links, is it necessary to configure LAG for those two links? (Those black links in the picture below.) Or the stacking would ...
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1answer
75 views

How to route traffic via firewall in EVPN + VxLAN

This is what i am trying to design new network, this is just on paper nothing finalized and i am sure it has lots of issue like firewall should be on leaf not border leaf etc. so that is why i am here ...
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2answers
37 views

How is it possible to get multiple virtual network interfaces with only one physical network interface?

I'm currently struggling about the fact that I could create (almost) unlimited virtual network interfaces with only one physical NIC. How does that can be possible ? To give you more context about my ...
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1answer
13 views

What is the format of data packet in AODV based MANET?

Can anybody guide me please. I spent a lot of time over the literature to find out the data packet format of AODV routing protocol. however I found only RREQ, RREP, RERR and ACK formats, but there is ...
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0answers
37 views

Understanding TCP congestion control

Why is the congestion avoidance here [6,14] and [18,25]. Why not [6-10] and [18-22]? Other examples I have seen online suggest otherwise: For example here: https://www.researchgate.net/figure/TCP-...
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1answer
42 views

Design of 2 Lans Connected to a Watchguard m570 firewall

I have this architecture (without the firewall). I bought a Watchguard M570 as Firewall to add it in my network. My Question is : Could i use my watchguard and connect this one to my 2 LoadBlancers ...
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1answer
136 views

Latency of 10G fiber SFP+

I'm optimizing network stack for latency. We were using SFP+ with fiber than we came to know that Direct Attach Cables (DAC) have lower latency as there is no SFP involve Link. We are measuring wire ...
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0answers
9 views

Header Size of Sigfox packet

I am trying to find the header size range for a Sigfox packet and I can't seem to find it anywhere. I have looked on the Sigfox website and it says that the maximum payload is 12 bytes but it says ...
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1answer
21 views

Passing network bonding to other port [closed]

I currently developing network for office place using mikrotik cloud core router, the outline is 2 ether interface into 1 bonding interface and distributing into 2 ether interface or maybe 1 ether ...
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3answers
30 views

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
955 views

What is Open Radio Access Network?

what is the concept of this open radio access networks?? more specifically what is this "open" for? how is it different from those of general RAN?
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1answer
32 views

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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2answers
123 views

What is the advantage of Supervised Machine Learning over Deep Packet Inspection in Network Traffic Classification?

As per the definition of Deep Packet Inspection (DPI), it uses signatures for packet filtering. Supervised Machine Learning can help put a label on a packet which does not get identified by Deep ...
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1answer
30 views

What would the bandwidth be while transferring from a machine with a 2.5 Gbps NIC to a machine with a 10 Gbps NIC?

I have two machines connected via a managed network switch capable of supporting 10 Gbps bandwidth. What would the bandwidth be if I transfer data from machine 1 with a 2.5 Gbps network card to ...
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0answers
14 views

what is role-based source authentication network misconfiguration mean?

what is role-based source authentication misconfiguration mean? in a Context of SDN where i have assigned priority to a candidate flow rule , recognized 3 standard authorization levels among flow ...
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1answer
64 views

Are subdomain and subnetting related concepts?

Recently while trying to grasp some basic networking concepts - I felt subdomain and subnetting are related concepts and wanted this group to confirm and add more insights on this. I understand that ...
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1answer
27 views

How are the rules in a network protocol defined? [closed]

New to network protocols here. Everywhere I read about network protocols it keeps claiming that they are simply just some rules and guidelines that allow computers to link to networks - but how is ...
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1answer
36 views

Why does Network address translation (NAT) need Port Address Translation (PAT) if IPs are different in the internal network?

For example, there are several servers in the local network 192.168.0.1, 192.168.0.2, 192.168.0.3, etc. They are connected to one public IP. Why does NAT also assign ports to each local IPs that are ...

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