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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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0answers
14 views

Why are large networks unable to rely solely on the use of physical addressing? [duplicate]

First of all, I would just like to point out just how new I am to the subject of computer networking. Therefore, I apologise if my question seems a poor one however I am currently unable to find an ...
0
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0answers
20 views

Juniper SRX answers all ping requests instead of forwarding

I have about 4 different subnetworks at my place, when i'm trying to ping to static device in subnetwork1 from subnetwork2 i always see that device pings, even if it's off. I assume my SRX300 answers ...
1
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1answer
28 views

Is this computer a threat? On same network range, but in a workgroup

We have a normal on-premise Class C network with an internal IP address scheme of 192.168.15.x (hypothetical). We have a SonicWALL device that acts as a VPN server for external clients, a DHCP server ...
0
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0answers
16 views

why the DOWNLOAD speed is 124 mbps, but the upload only 19.83 mbps? [on hold]

I have a server in Los Angeles, when I use speedtest for testing the network speed. you see the DOWNLOAD is 124.07 Mbps, the UPLOAD is 19.83 Mbps. so, I have two questions: 1. the DOWNLOAD is Server ...
0
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3answers
30 views

What's the technology of bind MAC address with IP address, for solving iP conflict issue?

What's the technology of bind MAC address with IP address? I have a problem with the LAN, such as in my LAN, there are 192.168.100.0/24, gateway is 192.168.100.254/24. user A's IP is 192.168.100.1/...
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0answers
9 views

How can I add a storage device to my router? [on hold]

How can I add a storage device such as pendrive to my router , which can be accessed by all device connected to the lan network (router) ?? NB : low cost is a must 😁 TIA
0
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0answers
21 views

Is this setup possible. Multipler user PC's & KVM. 1 Shared PC - Switch [on hold]

I'm not in an IT role or an engineer. In fact i'm usually just on the coding, excel & share point site. However I do have a requirement that i want to check is possible as it seems to have been ...
-1
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0answers
12 views

Secondary router used as access point has extremely low speed [closed]

I have had a spare BT Homehub 4 set up as an access point connected LAN-LAN via power line adaptor for boosting signal in my house. The main router is an ASUS DSL-AC68U. I receive download speed of ...
1
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2answers
51 views

Passing Light but No Data

Can anyone tell me what type of jumper I need to use when connecting single mode fiber to multi mode fiber? I have a run of multimode fiber that was extended with single mode. I have used both single ...
0
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0answers
36 views

How to route a specific users IP from WAN to a specific host IP on a subnet OPT1 (pfsense)

I host a game server, Players and Devs use the same launcher/client that has hard coded ports (5555) that cannot be changed. (No Configuration Files) How would I route Devs to the Development Server [...
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0answers
27 views

How does the PPP/PPPOE exactly do and work? [closed]

I haven't yet understood whether all data stream needs to be encapsulated in PPP/PPPOE frames to be sent to one own ISP or it is just a matter of authentication.
0
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1answer
42 views

Second default gateway on demand? [closed]

I am in to a strange network setup, Hosts on the secure network, are all under a domain and use various services on the domain. When ever the need to access web application on the more secure network ...
0
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1answer
23 views

Sending Frames Among Routers needs MACs?

Following this discussion: ARP request outside of LAN; Target machine or router response? I'd like to understand if router 1 sends its frames to router 2 through the same ARP process as discussed ...
5
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2answers
811 views

What precisely is a link?

When reading about layer 2 the word "link" is frequently used but strangely I'm struggling to find a formal definition of it. What is the precise definition of a link? So in the image below, how many ...
1
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1answer
43 views

Connecting networks from different states [closed]

Is it possible to connect 5 networks together using one router as a central component even if the networks aren't close to each other? An example would be 2 networks in Houston and 1 in Dallas Texas, ...
1
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0answers
18 views

Number of cable links required in bus topology [closed]

For an arrangement having N stations what is the number of cable links required? I think it is N+1 because one backbone and N taps Thanks in advance........
1
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1answer
62 views

Weird Juniper switch behavior

Weird Juniper switch behavior I have bought EX4300 and SRX300 on ebay to study it and started to read documentation. After some time i wanted to test my knowledge and configure it to test it at home. ...
0
votes
1answer
18 views

how p2p connections are established over the internet [closed]

it's being said that a peer to peer network is not server-base for routing and processing data and only uses server for getting the up to date nodes addresses (probably their internet IP address) to ...
2
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1answer
45 views

Can anyone Explain me difference Between PSH and URG flag in TCP segment

According to me when PSH flag is set , it indicates that data will have to be sent immediately to the wire and on receiving side the data has to be pushed to the application immediately . When URG ...
0
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0answers
22 views

problems in nfdump statistics

i am a newbie to network monitoring. an i tested a nfdump trace file with " nfdump -r -s srcip " then i got the following results. As in the screen shot, what is the different between marked flows ...
0
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1answer
31 views

How to troubleshoot VPN packet issues? [closed]

I'm a web developer (10 yrs), and am tech savy, but don't know a lot about networking, so please forgive my ignorance. I work from home, so I'm always on my company VPN. Over the last several weeks I'...
0
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2answers
45 views

should phy layer and mac layer be designed together?

I have a question about the independence of the layers. I know that the layers in protocol stack are designed in a way to be independent from each other. I want to know does it mean also that we can ...
-1
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1answer
40 views

Mac Address Flapping and switches

Is mac address flapping the reason why switches don't exchange switching information just like routers exchange routing information?
1
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0answers
39 views

Customized captive portal with external DHCP server [closed]

I am stuck in one issue for which I need your help on this. Actually its bit complex to explan about my situatuion but I will try my best. I am working on customized captive portal on arm processor ...
0
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0answers
8 views

Given an IP address and a subet mask, how do I find the max number of subnets and usable host IP's? [duplicate]

my question is based on an IP address and a subnet, how can I find the maximum number of subnets and the number of usable host IP address per subnet. This is all IPv4 if that helps. For example if I ...
4
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2answers
329 views

APIPA and LAN Broadcast Domain

I just want to know can a Local Area Network broadcast domain be operated by only relying on APIPA?
0
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1answer
59 views

How to change AD on Juniper router?

I have this route on my Juniper Router and some destinations have two routes: OSPF and BGP. I want to change the administrative distance for the BGP route so that it will be smaller than the OSPF ...
3
votes
1answer
30 views

ASA 5505 cant access inside network from Anyconnect SSL Connection

So I have a ASA I can connect via SSL perfectly fine receiving internet.My issue is that I cannot ping any device on the network especially the inside network on my router. My topology is a ASA 5505 - ...
0
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0answers
12 views

Subnetting help [duplicate]

I am sorry if this is a simple question, but I am a little overwhelmed and I can't seem to grasp what I need to do. Long story short, I took over a network that was poorly designed in my opinion, but ...
1
vote
3answers
62 views

How to explain the data flow of OSI model layers in a single picture [duplicate]

Take an example of searching www.example.com in a web browser. I have some confusions at each layer and they are We have opened a web browser and searched for www.example.com. Now, As far as I know, ...
1
vote
1answer
37 views

Help with network setup [closed]

I have the following situation: Router 2 is a given. It is used by several people to go on the internet ('People we don't trust'). We are a tiny company that is supposed to go on the internet ...
7
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2answers
853 views

Why do IPv6 unique local addresses have to have a /48 prefix?

According to RFC 4193, unique local addresses will always have a prefix of FD00::/8.. but according to Wikipedia: The block fd00::/8 is defined for /48 prefixes, formed by setting the forty least-...
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0answers
40 views

Colocation network setup - 2 switches with each 1 uplink - redundant configuration question

I have a question about the network configuration when connecting 2 switches in a colocation rack via 2 uplinks (1 uplink to each switch) to 2 other switches of the datacenter itself. My topology ...
1
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2answers
49 views

Spanning tree protocol

I have a questions regarding STP and i would like to know if STP is only a feature of layer 2 switches? i am on GNS3 and i am trying to enable STP but it tells me that there is no spanning tree ...
0
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1answer
50 views

Bizzare Issue - Can't connect to Sites/Server After a Variable Period of Time [closed]

I’m in desperate need of help. I have a bizarre problem that I’ve had no success in solving. See below the pertinent backstory and details. BACKGROUND This all began about two months ago. Two ...
0
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2answers
30 views

How does a router know it's received an OLSR message?

So I'm working on my own routing protocol based on a alternative to IP, called ILNP, and I'm having trouble understanding how a router differentiates control packets and data packets for OLSR. The IP ...
4
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2answers
84 views

Are network protocols and routing protocols different things?

When reading about network protocols it says they are a set of rules and format for communication between devices over a network, so basically an agreed way of how to communicate over a network. But ...
0
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1answer
50 views

Can two packets propagate on the same communication link?

Can two packets, say from host A, propagate on the same communication link while the first one is still on its way to the next point, say host B?
0
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1answer
53 views

TCP - correlation between ACKs and receive window

EDIT: I think i get it now. So a simple sliding window mechanism basically assumes the correctly received data is processed immediately. Therefore an acknowledgement implies the data was received AND ...
2
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0answers
35 views

Question about creating Subnets for a large amount of sites that will make a site-site tunnel to our datacenter [closed]

Our data center network is: 10.20.44.X/24 I want to have our sites use 10.X.X.X/24 (Site Number, VLAN, host) EG: Site 30 10.30.10.X/24 10.30.20.X/24 10.X would be corporate network 20.X would be ...
0
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1answer
67 views

Unable to configure SR-TE (Segment Routing Traffic Engineering) in CSR 1000v

I'm trying to configure SR-TE (Segment Routing Traffic Engineering) in CSR 1000v IOS XE 16 using the official tutorial in here Segment Routing Traffic Engineering (SR-TE) I have the same topology in ...
0
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2answers
63 views

Unknown Network cable

recently I found a cable in my drawer which one side has a RJ45 connector with an unknown color code of red brown black white green I tried to solve it by myself but I couldn't so I upload a picture ...
0
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1answer
52 views

OSI Model vs Network Model: Does It Matter Which One You Use?

The OSI (Open Systems Interconnection) model is comprised of the following layers: 7. Application Layer 6. Presentation Layer 5. Session Layer 4. Transport Layer 3. Network Layer 2. Data Link ...
0
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1answer
65 views

What is difference between “topology of network” and “geometry of network”?

In the Internet some times, we hear of the term "geometry of the network": https://bit.ly/2VqI2YO Is there any difference between the term of "geometry of the network" and "topology of the network"? ...
2
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0answers
37 views

Ad hoc vs Mesh, which one to use?

Say we have four nodes (A, B, C, D) that are arranged in a chain-like topology. A <-------> B <-------> C <-------> D Only the adjacent nodes are in range of one another (A can ...
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0answers
16 views

Why maximum length of IP、TCP、UDP packet is not suit? [duplicate]

From many tutorials, I get follow knowledge(maybe I'm misunderstood) : maximum of an Ethernet packet is about 1500bytes. maximum of an IP packet is about 65535bytes. maximum of a UDP packet is 65515 ...
3
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1answer
132 views

Juniper SRX320 Dynamic VPN, cannot route to Remote-Protected-Resource

Multiple VPNs setup with a Juniper SRX320. The SRX320 has an irb interface as follows: irb { unit 0 { family inet { address 192.168.120.1/24; } } } I've setup ...
0
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1answer
42 views

Connecting two ISPs on one network

I am working in an institute where the internet connection is divided amongst 3 different floors: Ground Floor, First Floor and Second Floor. Now since I am new to the networking, I know the ...
0
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0answers
15 views

Is there currently a formula for calculating the network ID when you know the amount of networks used? [duplicate]

edit: I wanted to mention the reason I am asking is because I have scoured the internet to find a formula similar I figured a formula and wanted to know if such a formula is was already in use. (...
1
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1answer
32 views

Defining what type of casting based on IPv4 address

I'm kinda new to networking. I have a small question, how can I determine what type of casting (unicast, multicast or broadcast) is it based on IPv4 address. For example: 142.55.172.200 I tried to ...