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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wireshark is not capturing my target packets

My question is this. I am doing full scan of IP address on Wireshark but I am not receiving my target packets while scanning as I am using port 80 as a target port. What will be the issues regarding ...
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Can't access to some websites when using VPN and connected to mobile hotspot [closed]

I am using ubuntu 20.04 and OpenVPN 3/Linux v18_beta. I have a VPN profile that my company had given to me in order to be able to access its internal resources. When I'm connected to home WiFi, I can ...
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Is RHCSA useful for all cloud careers? Any recommendations? [closed]

I am thinking of cloud architect or cloud engineer as an eventual career. But I am also considering cloud cybersecurity and maybe data.Now I am studying for my cloud practitioner certificate. Would ...
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Subnetting within an existing Production subnet [closed]

My company has a corporate-allotted /16 network where we can place any and all of our networked devices. I am inheriting this network, and would like to implement subnetting for security and all the ...
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1 answer
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Link utilisation

Studying Packet Switching. Encountered a question - What i know? Packets are transmitted over each communication link at the rate equal to full transmission rate of the link. Router is using Store-...
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1 vote
1 answer
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Who officially declares cellular network technology?

There are 4 to 5 cellular network technology 1G 2G 3G 4G 5G (upcoming maybe) But who actually defines or officially says that this will be the next cellular technology? which organization or which ...
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1 answer
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In what situation would normal choke packet be preferred over hop-by-hop choke packets?

When the host is far away, it makes sense to use hop-by-hop choke packets to resolve congestion. But is there situations where normal choke packet is more appropriate? And by the 'source' we mean a ...
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1 answer
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Arista vEOS and EVE-NG setup

I have EVE-NG up and running and Have successfully imported an Arista EOS image. Connected a couple of VPCS to it. But I can't seem to get them to ping each other. I did assign IPs to the VPCS for ...
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2 answers
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How does communication between two devices from two different networks work?

Lets say i have a device with private IP address 192.168.1.24 in one network with public IP address 20.156.2.14. Then there is another device with the same private IP address 192.168.1.24 in another ...
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2 answers
69 views

How does NATing work

I'm not 100% understanding how NATing works. Let me setup our network and talk this through. So first of all, lets say that I have an IP size of 4 bits so 16 possible combination. The only private ...
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How many number of bits and hosts? [duplicate]

If it's an IPv4 address and it's in the class B network. Iam supposed to make 20 subnets, what will be my number of bits to consider for the subnet and the number of hosts?
1 vote
1 answer
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Test communication of interface using Cat5E loopback

So I need to create a simple process to test a large amount of gigabit network ports. Since I don't want to setup two machines and run software on both the test connection my first thought was to ...
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1 answer
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Relation between the BACnet 4 layers and the TCP/IP 5 layers

How are the BACnet 4 layers (physical, data link, network, application), related to the TCP/IP 5 layers (physical, data link, network, transport, application)? Are they separate of them, or build on ...
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why is the length same with the MSS value? [duplicate]

I have read this I have issue with MSS and window size and what is difference between MSS and Window Size? I'm confused. I have a setup like this: my host machine (Macbook) and a virtual machine (...
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1 answer
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Ring Network random errors - unmanaged switches troubleshooting? [closed]

I have a ring network comprised of primary network , and secondary network, 5 PCs connected to it, another 20 controllers and 2 PLCs. The network is made with Phoenix Contact switches, about 30 PCs , ...
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1 answer
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How do ISPs detect different types of traffic for varying QoS?

When I was looking into the use of CoS (Class of Service) bits, I came across a lot of articles which said that it was used to mark different types of traffic and offer varying quality of service. For ...
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Access point MAC addresses shows up in Floorplan deployment instead of the access point names

I have about 5 Aruba access points assigned to a site called storage that I have configured in the mobility conductor to have names based on the rooms they are placed in. When these are later on going ...
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2 answers
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Office is 420m away from the landline relay box, need help figuring out a solution

We are an agricultural technology startup, we develop and provide advanced solutions like hydroponics etc. We are based in Egypt, Africa; where the most you can wish for is FTTC, regardless, the ...
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1 answer
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Noob: i design a network for 156 computers/4 printers, need help in few things

Sorry if this stupid questions: I just learn networking like a week. Lets say company xyz have 39 computers and 1 printer in each floor, there are 4 floors, total amount of computers is 156computers ...
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1 answer
87 views

Does MTU setting affect sending, receiving, or both?

Consider the two devices: A: PC, NIC MTU is set to 1500 B: Router, MTU of relevant interface is 1478 Now if A sends a frame of length 1500 to B, something might go wrong. But what if I set A 's MTU to ...
1 vote
1 answer
61 views

Why does congestion happen

Imagine a network full of routers . The job of a router is to be able to receive multiple packets from multiple sources then send the packets 1 at a time in each of its outputs.If the routers are able ...
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0 answers
32 views

How to enable ip address for all ports in the Cisco IOS Web Browser

Good afternoon, how do i enable the ip address in webui for the cisco switch you can see the picture below ipv4 is unassigned, everything looks good with me.
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1 answer
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GNS3 - hosted or VM?

I know that there is a gns3 client that is installed in the operating system. but i see there is a gns3 for vm that gns3 for VM In a few words it is a virtual software to use it with a hypervisor It's ...
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1 answer
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I need help with Meraki AP configuration

Hello everyone i have this port gi2/0/41 was configured for work station and port gi1/0/18 is configured for Meraki Ap , i need to correct the configuration in port gi2/0/41 and make is as the same ...
1 vote
1 answer
48 views

Basic question on 'network history based routing tables'

I have encountered the following sequence of words: 'routing table formed on the basis of network history information'. I know that initially, routers discover neighbor nodes and therby the possible ...
2 votes
1 answer
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OSPF unadvertised routes are reachable

My network consist of 4 routers: R1(with loop back network of 11.0.0.0) R2(with loop back network of 12.0.0.0) R3(with loop back network of 13.0.0.0) R4(with loop back network of 14.0.0.0) R3 is my ...
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1 answer
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How to stop broadcasting WAN network group to LAN network group?

First, I'm not really good at networking terminologies, So I'll explain the case as simple as possible. I have a PFSense set up, my PFsense gets its internet through its WAN IP 192.168.10.2 and ...
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1 answer
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where is the local resolver? [closed]

I'm looking into dns cache poisoning and I was confused as to where the local resolver was located. From what I understand the local resolver is located in a DNS server where we perform lookups when ...
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2 answers
45 views

Extreme 210 fiber port not connecting

Let me preface my question by saying I'm not a network admin and don't know nearly enough about networking. I have an Extreme 210-12p-GE2 switch. My problem is that the fiber port that was working is ...
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1 vote
2 answers
100 views

Why shortened version of IP4 exists and it is undocumented but supported everywhere?

For example there is an IP address 192.168.0.1 It is clear that you can use it as the full line, but try that one 192.168.1 It will also work, and it will be automatically converted to 192.168.0.1 ...
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0 votes
1 answer
107 views

How to create a subnet or secondary network? Do I need VLANs?

I am not new to IT, but in the past, I've always had a Network Admin to handle this type of stuff. That being said I know just enough to be dangerous. What I have is an old hodgepodge of different ...
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1 answer
40 views

In an SDN (OpenFlow), are all switches directly connected to controller?

I found this question how openflow messages get routed from switch to controller? (SDN) And in the answer it says: In SDN networks all OpenFlow switches are directly connected to controllers. But if ...
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1 answer
68 views

How FDB (Filtering Database) is filled out

I would like to understand what is used as a VLAN column in the FDB. For ACCESS port it is PVID if frame untagged or frame VID if frame is tagged, for TRUNK it is allowed VLANs? We can represent the ...
3 votes
1 answer
139 views

VLAN Ingress filtering process on switch

I read and read the information and somehow it is inconsistent or incomplete. The specification of 802.1Q also read, but to me as a person who has not previously read the specification is difficult. I ...
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2 answers
105 views

unable to ping loopback interface gns3

I have the following gns3 topology I'm unable to ping R1 loopback interface (destination host unreachable) I'm not sure what is wrong R1 configuration are shown below hostname R1 ! boot-start-marker ...
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0 votes
1 answer
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HP 6120XG switch LACP is blocked - error condition

Folks, I am dealing with very strange issue related LACP and not sure if its bug of 6120XG switch or something else. so let me explain my issue here. Network Diagram: I have two Cisco Nexus 9396PX ...
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1 vote
1 answer
62 views

How does a computer determine that an Ethernet frame contains an IP packet? [duplicate]

So far as I can tell, there is no "Next Protocol" ID at the Ethernet / data link layer. Nor do IP packets seem to contain any magic numbers for identification purposes. Does the OS bind each ...
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0 answers
17 views

Why does a router need 2 IP address? [duplicate]

Suppose there are 2 PC and 1 router in "LAN1", now if PC1 wants to communicate with PC2, it will need to uniquely identify PC2. So, PC2 gets a private IP that no other PC in LAN1 will have. ...
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GNS3 cant open terminal session in Ubuntu 20.04 LTS

I am having an issue with GNS3 after a recent run of sudo apt upgrade / update. GNS3 can no longer run gnome-terminal to open a session to a router on the VM. The router is working, and if I open ...
20 votes
5 answers
4k views

Why is Packet Size Limited?

I was reading: this answer to "Maximum packet size for a TCP connection", where it says: The absolute limitation on TCP packet size is 64K (65535 bytes), but in practicality this is far ...
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1 answer
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Can an application on two separate devices share a packet to similar resource?

Can packets requested for an image by an app on a phone be sent to same app on another phone by another user?
0 votes
1 answer
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WAP configuration consistency

Simple question, are WAPs always configured from the default gateway's web interface? Do you ever have to go somewhere else?
0 votes
1 answer
339 views

How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI? [duplicate]

How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI?
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1 answer
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Monitor network link to get bandwidth and/or latency variations

I have a controlled SDN lab scenario where I have a control plane and a data plane. The network is composed by: A switch 2 pc connected to the switch for the data plane A controller pc connected to ...
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3 answers
113 views

Do IDS/IPS/HIDS slow your network down?

Implying I were to use port mirroring, would it increase my network's jitter/ping and other networking matters?
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2 answers
69 views

Why is a switch port a collision domain?

I'm just starting my IT education and this is probably a very basic question but I'm having trouble with it. As far as I understand a collision domain is a part of a network where collisions can occur....
1 vote
1 answer
107 views

What device(s) I need for connecting two wireless LAN?

IP cameras on ground floor connected to a wireless router, and there is an internet modem on third floor. First of all, I want to extend ground floor wifi signal in order to connect to IP camera LAN ...
3 votes
1 answer
170 views

Is there an equivalent of the Cisco/ Cisco esque command "ip helper-address a.b.c.d" on Mellanox switches?

Apologies for my newbie question. I have recently had a Mellanox switch added to the mix. I was using an "IP helper-address" to forward DHCP requests in different VLANs to my DHCP server(s) ...
1 vote
3 answers
96 views

Longest Prefix Matching

I just learnt about this concept and I have a query which was also asked by someone earlier but was grossly misinterpreted. Suppose my Router has Routes for Networks: 192.168.22.0/23 and 192.168.22.0/...
1 vote
2 answers
117 views

Does a gateway always have to be on the same subnet as the host IP address? [closed]

The obvious answer is yes, I suppose, but my VPS provider doesn't seem to agree. I've just uploaded a Ubuntu 20.04 instance, and the provider is telling me: IP address: 77.xxx.yyy.zzz/32 Gateway: 10....
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