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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DHCP & DNS: Hostname Resolution [on hold]

Just making sure that I understand correctly, When a new node on the network joins the LAN, it sends the DHCP server its hostname, and after the DHCP server acknowledges the requested hostname, the ...
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2answers
29 views

Wifi antenna to detect clients

I would like to know if it is technically possibile to detect and recognize a client (PC/smartphone) during its wifi scan. My goal is to get the list with identifiar like mac address or other unique ...
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24 views

Why was the broadcast address changed from all zeros to all one's? [closed]

I know, all zeros as broadcast address was used a long time ago as you've mentioned in some other answer. I wanted to know what was the reason that it was dropped and all ones was used as it's ...
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14 views

How to track and chose the path when source have two paths to reach same destination? [closed]

One source(Host) have two paths to reach destination where first path have 3 hops and second have 4 hops . Please tell me why and how source get to know which path have to follow ?(Asked this question ...
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Develop a network in a Soccer Stadium. [Homework] [closed]

As said in the title, I need help developing a network for a Soccer Stadium with at least 400 points. I've been reading some news regarding the subject, but as I expected there is not too much ...
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15 views

Connectivity between two building [closed]

we have 2 buildings D-24 ( old one ) and D-21 ( new one )And we have connected both buildings with Airtel P2P 1gig pipe on fiber . Devices at both end :- Cisco 6504 switch at D-24 end Cisco 4500 ...
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0answers
16 views

Yealink T22p Quality Issue

We have around 7 Yealink T22p. Phone quality is good when only one phone is being used. If there are more than two phones are being used at the same time, one of them breaks up a lot but it breaks ...
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2answers
54 views

Sending an ipv4 packet to the Destination IP without a router?

We are replacing a "RF modem + Router system" with a Software Defined Receiver. After analyzing the receiving and sent signals we found out that an IPv4 UDP packets have been sent and received. The ...
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1answer
25 views

Why does this setup fail sometimes with Juniper EX4200?

I've got a very straight forward setup with the following devices: 1 x 10G Fibre uplink (internet) 1 x ASUS AC68U wifi router 1 x EX4200 20 x Servers (With IPMI and single ethernet) The EX4200 is ...
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1answer
50 views

Sending TCP packet to the other device without connection

I think the sending packet to other device works like the following. 1. The server device listens with port. for example 80 2. The client connects to the server devices. for example, the port of ...
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1answer
37 views

Is destination MAC address is always end point MAC address? [duplicate]

To simplify if the destination is on a separate network would the source still does ARP request or does it uses default GW's MAC as destination MAC?
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1answer
54 views

Collect UDP packets lost during iPerf test

I'm testing my network infrastructure where I'm using iPerf and UDP protocol. I'm using the following: On the server side: ubuntu@ip-172-0-1-11:~$ iperf -s -u and the client side: ubuntu@ip-172-2-...
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0answers
19 views

Topology/wiring recommended for my home network [closed]

I come to you to see if you can advise me on the best way to connect the ISP router and openwrt router (which provides wireless access, DHCP, basic local DNS and in the future VPN) in my house ...
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1answer
35 views

VPN server acting as a client for another VPN server [closed]

I was wondering if it's possible to have a VPN server that goes though another VPN server. Here a scenario that might explain my idea better: I have 4 computers 'A' - My Windows machine 'B' - My VPN ...
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1answer
54 views

Why the Ack number is bigger than the last Seq number?

Why the Ack number is bigger than the last Seq number? you see the Ack response for each two TCP packages. but there I have a question, you see the Ack response for Seq=19997, Seq=22893 and Seq=...
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0answers
15 views

How do I find the number of IP addresses between two given IP addresses? [duplicate]

How would I find the number of IP addresses from 224.65.0.0 to 225.127.255.255?
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0answers
22 views

Modbus Wireless

What is necesary to implement a modbus over wireless? I know that ethernet and modbus have different application layer different which evolves different package format and different physical ...
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1answer
48 views

IP Camera (CISCO Packet Tracer)

I've been asked to simulate a topology, which requires me to implement 2 CCTV cameras in a network using Packet Tracer. However I realise that their isn't IP Cameras in PT, so how best can I simulate ...
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7answers
6k views

Why can I traceroute to this IP address, but not ping?

I have an IP address and can traceroute to it, but I can not ping. You see, I can traceroute 43.224.226.50: dele-MBP:~ ll$ traceroute 43.224.226.50 traceroute to 43.224.226.50 (43.224.226.50), 64 ...
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0answers
30 views

The SNMP do not up the 161 port

I have a HUAWEI S5720 Switch(manage IP: 10.10.11.118), and I opened the snmp service of it: the configuration is: # ...
3
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2answers
68 views

Is it possible to limit a IP's traffic in gateway Juniper switch?

In my gateway Juniper Switch: ... irb { unit 0 { family inet; } unit 2 { family inet { address 10.10.10.254/24; } } unit 9 { family ...
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2answers
87 views

How can a IP under a VLAN communicate other VLAN's IP?

I have a network topology as below: I want to use the Server0 to manage(communicate) to 10.10.10.1-3. you know the 10.10.10.1-3 are vlan100's SVI. there have vlan 100 and vlan 501. IP programme: ...
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47 views

Why write a static route, it can communicative to each other in my scene?

I have a network topology like below: In Switch0, Switch1 and Switch2, I added the a SVI. However, it is not possible to reach from one SVI the other ones. Now, if I write the following static route ...
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1answer
42 views

When server has 2 NIC, device from one network can't ping another [closed]

I've successfully completed the network design and everything worked just fine until I tried to ping the computer on the edge. Well, Master server "sees" the connections on both lines, but when I try ...
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1answer
113 views

Route between two routers

This is the topology I'm working with. I'm able to ping from VPC_LAN_Ato VPC_LAN_B and trying now to ping from those lans to Router_2_Cisco. Here are the configurations for these 4 devices: ...
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1answer
49 views

Can't ping across router with two interfaces [closed]

This is the topology I'm working with. In the router, e0 is ether1 and e1 is ether2. LAN_A has a maximum of 96 clients. LAN_B has a maximum of 48 clients. VPC_LAN_A: ip 192.168.10.1/25 192.168.10....
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1answer
60 views

How do I know what is the origin IP if I ping from a router to a host of an external network in packet tracer?

When we ping from a router to a host in an external network, how do we know what is the origin IP of the packet? I searched and I didn't find a way to select which interface is the starting point of ...
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0answers
14 views

What would be the router's gateway IP address that is connected to a network containing two smaller networks [duplicate]

Assuming that we can use any available public address, we have two separate subnet masks 255.254.0.0 which contains 131,070 usable addresses (IP range 126.240.0.1-126.241.255.254) and 255.255.128.0 ...
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2answers
71 views

Do we send the same packets when we send the same data?

When we send the same data over a network twice, does this means that we are sending the same packets twice? I am trying to understand how my decoder works, so I command using an application on phone,...
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0answers
15 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 ...
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2answers
91 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 ...
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1answer
40 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 ...
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3answers
38 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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2answers
53 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 ...
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0answers
39 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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1answer
45 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
814 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 ...
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1answer
48 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, ...
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0answers
21 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........
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1answer
70 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
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1answer
34 views

how p2p connections are established over the internet [closed]

it's being said that a peer to peer network is not server-based for routing and processing data and only uses server for getting the up to dated nodes addresses (probably their internet IP address) to ...
2
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2answers
177 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 ...
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0answers
27 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 ...
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1answer
40 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'...
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2answers
47 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 ...
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1answer
43 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?
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0answers
69 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
9 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 ...
5
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2answers
362 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?