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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Achieving clock synchronization via 1588V2

Is it possible to achieve frequency synchronization between 2 network points (not TOD but actual frequency) - by using 1588V2 alone ? Or do we have to use SyncE for that ?
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1answer
48 views

iSCSI with dedicated switches

Looking to purchase some dedicated 10GB switches for our iSCSI setup. Would the following setup allow us to use two switches for redundancy? Two VMWare ESXi hosts, each with 2 10GB NIC Storage with 2 ...
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how does a propagation delay is being considered as part of a nodal delay? [duplicate]

considering the definition of nodal delay, it's the time taken by the network node devices(router, switch, and hub) to process a packet and forward it to the receiver. so propagation delay is a delay ...
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2answers
53 views

Do domains frequently change their IP addresses

I have the domain of some organization that requests my site too much. I want to restrict their access - but how? We only have the domain of the requester sfasu.edu . The QA of our team is using tool ...
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2answers
21 views

How an intranet can be invisible to the IP module if the IP module allows a non-networked device connect to a network system?

A quote from RFC 791 document "Fragmentation, transmission and reassembly across a local network which is invisible to the internet protocol module is called intranet fragmentation and may be ...
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Finding IP address [duplicate]

I have a device (logger for data acquisition), ut seems that someone has changed it's default IP address and lost it. I can't access it. Is there's a way to find it's IP?
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0answers
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IP Address mathematics-: How to add 120.89.96.129+399? [duplicate]

I am doing subnetting numericals to get my first job of network technician and I stumbled upon this math. I know the range of IP is upto 255. But I am not exactly sure how to add value to IP address ...
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4answers
170 views

Question about ARP requests

When a device tries to associate an IP address with a MAC address for a given device, it sends ARP requests to all devices connected to the same network. If I understand correctly, the searching ...
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1answer
30 views

public ip over private lease line

I have a private cross-connection with a service provider This private connection is connected from my firewall to their router and the L3 IP range /30 for this segment is private However, i just ...
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1answer
53 views

Is it possible to move a persistent TCP connection?

Context: Say I have a global cloud service. In each datacenter, I have numerous persistent TCP connections to various client devices. The TCP connections are distributed across various nodes in the ...
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1answer
40 views

How does a device on one network connect to with a device on another network

So if i have two routers and each router has lets say 2-3 computer devices.I am connected to the 1st router. So if i want to connect from my device to a device on the 2nd router than I will send the ...
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2answers
39 views

Cisco IOS -> ASA VTI tunnel not routing traffic

I have a VTI tunnel configured between two devices (CSR and ASAv). The tunnel comes up fine and is stable, however traffic appears to be unidirectional, from the CSR -> ASAv but not in the reverse ...
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1answer
92 views

What are the negative impacts of using non RFC1918 addresses on a private network?

I work for a company overseeing network design of a large industrial system. For our purposes, it's a backbone network that other stakeholders have their own L3VPNs defined on. It is a network with ...
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2answers
61 views

What does IP address assignment actually mean?

I don't understand when it said organization like IANA 'assign' block of IP address to RIRs. I mean did they just write this block belong to this RIR, this other block belong to that RIR, etc... and ...
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1answer
54 views

Why I can't ping in my network?

I have the following network: The following is my interface table: This is my PC IP address table: This is the configuration for Router ISP: ISP#show running-config Building configuration... ...
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1answer
23 views

how to configure EIGRP in my network?

I have the following network With the following routing table: Configuration of router 1 Building configuration... Current configuration : 1056 bytes ! version 15.1 no service timestamps log ...
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2answers
26 views

Doubt between first bit sent to first bit received and last bit sent to last bit received transmission

So, in Patterson's Data Communication textbook, I was solving some numericals related to transmission delay and stuff of that kind. I get that transmission delay is the time taken by a station to &...
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2answers
32 views

Does NAT change the L3-Encapsulation at all?

Let's say that a packet I sent requesting for a https server successfully reaches my target (NAT) router. The router receives it and through port-forwarding/triggering policies, it knows it has to ...
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1answer
46 views

How does deep packet inspection (DPI) extract metadata from packets?

DPI software extracts metadata (as an additional function apart from classifying applications / protocols) But how does it do this? For classification, I get that you can use pattern matching or port-...
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3answers
49 views

How to make 2 diffrent networks in router ping each other

Hello i have this 2 routers how i can make them ping each other and alos the devices connected to them
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1answer
33 views

Newby question: what is the backbone of a script to limit incoming and outgoing network speed, using TC? [closed]

I am new to TC / tc (traffic control), but I need to limit the speed of incoming/outgoing network traffic for a docker container. I read a lot, but still I have a lot of confusion on what is needed. ...
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1answer
45 views

Authentication center in GSM

We know that the AuC (Authentication Center) is used to identify GSM subscribers in the case of roaming or when the subscriber is requesting access to mobile network for the first time. But, I'm ...
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1answer
24 views

Fail-Safe Network With 2nd Switch?

Is it possible to set up the same VLANs on two different switches with same IPs, but different MACs on dual port network cards? In case switch 1 is down or needs maintenance I would like switch 2 to ...
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2answers
34 views

How to tell if a device on the network is an access point?

Let's say we have a network with multiple access points. The command arp -a can be used to list the IP addresses and physical addresses of the devices that are on the same network. Now, is there a way ...
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1answer
63 views

I cant ping across Lan?

Current configuration : 2695 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec service password-encryption ! hostname ...
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2answers
79 views

It is possible to have multiple webservers running on same port inside one network?

Lets say we have a network A with two webservers inside it, S1 and S2, both hosting a website on port 80. When a client from a different network is addressing A:80, which host inside network A, will ...
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1answer
44 views

RSTP Network Switches Port Base MAC Address

How to ethernet managable network switch manage the dynamic table entries although receive "port base MAC address frame" like RSTP,STP protocole ? I know the dynamic mac table save the ...
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2answers
857 views

Why are there 11 channels in WiFi communication instead of 3?

I'm a little confused about subdividing the WiFi radio band into 11 channels in the USA, 14 in Japan, and 13 in Europe, and to then use just 3 of them because of the overlapping problem. Why didn't ...
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2answers
57 views

What does network interface do? and what's difference between a network interface and a network interface card (NIC)?

I'm a little confused about the network interface. Based on my understanding, a network interface does the translation between link-layer and internet layer, and does the ARP. Is that right? Also what'...
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1answer
46 views

How is data flow in a twisted pair cable?

If i use a ethernet cable (twisted pair cable) in what form the data is flowing - digital or analog signal. And in pair 1 that is wire no 1,2 there is transmit+, transmit- respectively. how is pair 1 ...
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2answers
55 views

Why does ARP request not use a router instead of broadcast?

Why in ARP request does the source computer broadcast a message with the destination IP address to find the MAC address of the destination computer? Why doesn't it send the message to the default gate ...
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1answer
30 views

How do devices discard packets?

My question is fairly simple, I'm just not entirely sure what information I'm looking for. Let's say that a host receives a packet that is supposed to be for another host, and discards it. Where is ...
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1answer
13 views

Port 8080 closed over VPN (Linux, OpenVPN, webpack, Node.js application). How to troubleshoot? [closed]

I am running a node application that uses webpack. The application starts and automatically selects the port 8080 on localhost: The website works correctly on the browser on my machine. I want now to ...
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0answers
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Some random client requests fails with unexpected TCP [RST] packets [duplicate]

I have a service doing listen that serves clients over a TCP sockets connection with a raw binary protocol. The principle is basic: the connection is established, the client sends a request with data, ...
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2answers
1k views

Is a point-to-point T1 line literally a line in real life?

In Packet Tracer this is how we draw a WAN link, or a T1 link: Does the "red line" here literally means there is a single cable connecting the two routers in real life? If no, then what are ...
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1answer
55 views

sFlow configuration tcam question for Cisco Nexus 9396PX platform

I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. hardware access-list tcam region span-sflow 256 ! feature sflow sflow counter-poll-interval ...
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0answers
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Could someone please clarify my understanding of this question? [duplicate]

I have been asked to use a particular IP address for a homework lab. The IP address is 218.179.169.7 and I have been asked to create 24 subnets and use the 16th network address. I dont fully ...
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2answers
43 views

How do machines setup a route in a network?

So I have been reading a bit about networking, and I am a bit confused about what exactly happens after domain name resolutions. Lets say I do a get request to "some.website.com". First, my ...
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2answers
106 views

How TCP sequence numbers work in bidirectional communication/sliding window?

I was trying to understand how TCP works (not in detail of course). I was surfing the web for easy-to-understand flow diagrams and a question arose and couldn't find a straight answer. Let's suppose ...
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2answers
28 views

Is packet transfer still possible, if the routers don't have the updated link cost information in the Bellman-Ford Algorithm?

In the Bellman-Ford Algorithm, the principle of "Good news travels fast but bad news travels slow" is implemented. So if the cost of the link between two routers is increased, then the ...
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1answer
38 views

Establish a network between two remote systems

Is it possible to create a network between remote systems without internet? if true; how?
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1answer
30 views

Why I am Getting %100+ Network Usage From SNMP? [closed]

I am using SNMP in Ubuntu 20.04 to get the network usage info and I am using this formula to calculate the network usage: InOctets : The difference between two poll cycles of collecting the snmp which ...
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2answers
64 views

Why are ISPs arranged in hierarchies?

ISPs are organised in a hierarchy where the Tier 3 ISPs are connected to Tier 2, and Tier 2 ISPs are connected to Tier 1 ISPs. Why are they organised in a hierarchy? Is it because if all devices were ...
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0answers
17 views

What enables the UE to make calls to more than just an emergency number once it's registered to a cellular network?

UE can camp on to the nearby eNB and still be able to receive RSSI signals regardless of whether the SIM is inserted or not but you would only be able to make emergency calls? What really "...
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3answers
163 views

Why is sometimes a good idea to disable auto-negotiation?

I am studying CCNA and I am trying to learn the logic of the networking. In the CCNA book, it told me that sometimes disabling auto-negotiation is a good idea but I didn't understand much why and ...
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0answers
18 views

How do switches learn the neighbour MAC address? [duplicate]

According to the CCNA Official Guide a switch learns the new MAC address by checking the source MAC address of a new frame. Here is the quote: Switches build the address table by listening to ...
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3answers
79 views

How are MPLS routers connected to each other?

So MPLS is one of the many ways to connect two or more distant sites. In other words, it is some kind of a "WAN solution". But what is the "WAN solution" for MPLS? Take for example ...
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0answers
53 views

Download ExtremeXOS

I need to update the extreme switch, I found a lot of instructions but I don't know where to download the latest version of extremeXOS. Thanks a lot in advance for your help.
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1answer
49 views

How is the subnet mask detected over the internet with CIDR (classless inter domain routing)?

Lets say there are two public IP addresses. One is 21.120.12.8/16 and the other is 21.120.12.8/8, they are different network IDs but when used over the internet how are they both differentiated? Or is ...
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3answers
147 views

Daisy chained ethernet: how to “tee” the loop without switch?

In this Schneider Electric white paper: Reduce Ethernet Connected Cost with Daisy Chain The author provides a daisy chain Ethernet topology in Figure 3: To connect the loop to another device (I'm ...

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