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How strong a ground loop would necessitate the use of isolation transformer in Ethernet? [closed]

One reason against the use of shielded twisted pairs in residential environment is the possibility to create a group loop between equipments, as discussed in Shielded Twisted Pair (STP) termination ...
0
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0answers
7 views

ARRIS CM820S modem and WiFi [closed]

this if my first post on this stack! I've recently moved in a flat to see an Arris CM820S modem, which is working fine when i connect it directly to the PC using standard RJ45 cable, which is the only ...
0
votes
0answers
7 views

IB/NDSPI vs. Sockets [closed]

On Linux, RDMA support is offered via IB verbs while on Windows it is offered via NDSPI/NDKPI. Why can't both OSes re-uses existing socket interface? Is there something about RDMA that cannot be ...
1
vote
2answers
64 views

Are all packets addressed with the MAC address of the router as they leave the machine?

In the Comptia Network+ All in One, it is said that most home routers have a switch built into them. It is also said that the first thing the router does is strip off any layer two information present ...
0
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0answers
9 views

How can I disable auto dns update from router? [closed]

I have iball 300M MIMO wireless-N broadband Router. I found that the dns iball.wifi.net is automatically adding in the system. I don't want this. I am using my own dns. How can I disable it?
0
votes
1answer
19 views

What is the purpose of Cisco's `ip domain round-robin` feature?

While configuring one of Cisco's routers and reading documentation I've found an interesting feature: ip domain round-robin. Documentation says, that this options makes dns server rotate entries ...
-1
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0answers
35 views

Hello, Network Problem [closed]

I have a question I wanted to implement a program in C++, Object Oriented and threaded. The program must be run in a shell, like the example: PROGNAME ifs=[IF-LIST] ./desiredprogram ifs=eth01,eth02,...
0
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0answers
18 views

Please correct my VLAN conception [duplicate]

As I know VLAN is a control function for layer 2 engine. I think VLAN in layer 2 is cutting switch ports as group and specify trunk port in layer 1. So VLAN ID in layer 2 means each VLAN pool identity ...
0
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2answers
194 views

Recommended switches and routers configurations for a building of 5 floors?

Just recently I had an interview for a network Engineer position. The interviewer asked me the following: You have a building of 5 floors, where each floor has around 30 employees. What is your way of ...
0
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0answers
25 views

How do I setup a datacenter in my home [closed]

So I am buying 50 blade servers tomorrow for $1600 and I plan on setting up a datacenter. (I have been given the option to colocate or set it up myself so I am not worried) I have a 1gbps home ...
-1
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0answers
11 views

Arduino parses UDP packets through Ethernet with gibberish in it [closed]

Arduino Yun (with built-in Ethernet) is connected to a PC (through Ethernet) which is connected (through WiFi) to my router. Is set to receive UDP packets from another PC (on the same network). That ...
0
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0answers
15 views

Assigning Static IP to the servers connected with router through switch [closed]

I am looking out a way to assign static IP to the servers which are connected to a 16 port switch with router at the beginning. Here is the how the architecture looks like I have got /28 IP pool from ...
0
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0answers
7 views

Unable to connect to wireless networks [closed]

I recently moved to a different hostel at my university, and my router's wireless network, which worked fine in the previous hostel, suddenly started behaving weird. My devices (tried with my phone ...
-1
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0answers
7 views

Proxy error in BurpSuit [closed]

Getting this error in burpsuit.I don't know What is this! Even my intercept is off.I just know is that this is a proxy error.
0
votes
2answers
20 views

why sometimes we need to use Broadband Transmission (Using Modulation)?

I was reading a textbook which says: Baseband transmission requires that we have a low-pass channel, a channel with a bandwidth that starts from zero. This is the case if we have a dedicated medium(...
-1
votes
0answers
15 views

Modem take place of my public address [closed]

I want to access my localhost remotely, my localhost ip & port is:192.168.1.3:8080. I did all necessary things(static ip, port forwarding...). Inside my network everything work properly so i can ...
0
votes
0answers
17 views

HPE 5130 Comware dot1x logs [closed]

I have recently installed a new switch: HPE 5130 with Version 7.1.070, Release 3506P02 and I also have another HPE product : HPE 3600 with Comware Software, Version 5.20.99, Release 2112P05 and there ...
0
votes
1answer
11 views

Juniper MX: NTP broadcast on two VRFs with the same addressing

In Juniper, NTP broadcast is set at system level, so two VRFs cannot use the same addressing and use NTP broadcast at the same time. Is there any alternative?
0
votes
0answers
34 views

CAT 5 cables work, but CAT 6 doesn't? [closed]

My setup is, Router - CAT 5 cable - CAT 6 rated wall socket - CAT 6 cable - CAT 6 rated wall socket - CAT 5 cable - PC This works fine but the speed is limited. When I replace the CAT 5 cables with ...
0
votes
1answer
42 views

TCP/IP conditions to end an etabilished connection

What happens if the Client crashes and never closes the connection? Or the server crashes before being able to send a ACK FIN packet. Are those cases implemented in software?
0
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0answers
21 views

Cant access wireless devices from a wired device [closed]

I have a ZTE F660 router provided by the ISP. My PC is connected through wire/ethernet cable to the router. Recently I was tinkering with a microcontroller known as ESP 8266 commonly used for simple ...
0
votes
0answers
10 views

How does an ACL work which permits outside-in-traffic and whose destination is outside network? [closed]

I'm very confused about an ACL in asa which permits outside-in-traffics and whose destination is outside network. I need to know if the configuration below is possible. If so, would you tell me if it ...
0
votes
1answer
21 views

How to identify Digi CM Console Server via command line/SSH?

Digi CM Console Server is a Secure Access and Management for Servers and Network Devices https://www.digi.com/products/networking/infrastructure-management/console-servers/digicm#overview How do we ...
0
votes
0answers
10 views

public static NAT IPv4 address also for outgoing traffic? [closed]

Since my ISP doesn't assign public static IPv4s anymore (but only IPv6), I bought a static NAT IPv4 address, which I use as my "public IPv4 address". The main reason I need this is that I'm ...
0
votes
0answers
22 views

How to init connection with a Cisco over serial & minicom?

Trying to connect to a Cisco router, in purpose to learn Cisco skills that could help me finding a job. So, I plugged a cable in the rj45 Console (blue) port of a Cisco 888 router, and other end into ...
0
votes
3answers
38 views

Can the network devices run out of ephemeral ports due to high use of websockets?

This might be a really stupid question, but something I really want to understand. My understanding is a tcp connections staying open indicates that each of the network devices between the client and ...
0
votes
0answers
15 views

Don't play music on hold for conferences

At my workplace we use Cisco video phones, CUCM, VCS, and MCU for conferences. Recently we have had some embarrassing situations where someone puts the conference on hold and everyone has to talk over ...
-1
votes
0answers
15 views

Connecting a Dell Box to the Internet [closed]

Suppose you have a dell box which has an ethernet cable going to a router. So you have internet. Would you be able to ssh into a server as well? Or does having internet make it impossible to get ...
-1
votes
0answers
17 views

Is there any such thing as a decentralized network of any kind which actually has some serious amount of users? [closed]

Note: I asked this earlier today. It was redirected to: "Is an entirely decentralised peer-to-peer network feasible? How far could it be scaled?". That question, and the answers, are sadly ...
-1
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0answers
9 views

Is there any such thing as a decentralized network of any kind which actually has some users? [duplicate]

I have exactly one .onion bookmarked in my Tor Browser. I use it once every few months. I have tried out countless decentralized projects and they are all absolute ghost towns. Nobody uses it. I have ...
0
votes
1answer
24 views

iperf3 UDP tuning

I am trying to test throughput in the network. But when i start iperf3 client for sending UDP packets it sends TCP SYN packets. Why does it behave like this? (it should not send udp tcp syn while ...
2
votes
6answers
2k views

Why can't we create a hierarchy of hubs?

I was reading the Comptia Network+ All in One book and I came to know that we cannot create a hierarchy of hubs. My question is why so? Are MDIX ports simplex? Why is it not possible for the hubs to ...
0
votes
0answers
7 views

Azure Private Link [closed]

In Azure Private Link, how is it possible to have for example a SQL server which does not have an internet gateway, NAT devices or a public IP address but still being able to connect externally ...
0
votes
2answers
23 views

How to access Cisco 2500 series admin GUI interface with known IP address when Firefox/Chrome state connection cannot be reached?

I know the username and password of my Cisco 2500 series wireless & ethernet controller and its IP address, but when I enter the IP address into a web browser (Firefox and Chrome) it states the ...
0
votes
1answer
26 views

Unicast and Multicast MAC address convention

I need help in understanding how Unicast and Multicast MAC address is differentiated as explained in wiki. According to what I understood, when the least significant bit is set as 0 in the first octet ...
1
vote
2answers
43 views

difference between switchport trunk encapsulation dot1q and switchport mode trunk

I am new to network engineering and I am currently delving deep into L2 functionality.what is the difference between these two commands: 1 switchport trunk encapsulation dot1q 2 switchport mode trunk ...
0
votes
1answer
17 views

Blocking 2 VLANs from accessing a specific VLAN on a network

I'm working on a project in packet tracer and I have a server connected to VLAN 10. VLAN 10 has a single server device on it and the IP scope is a /30. I have 8 other VLANs across 2 sites. The 2 ...
0
votes
1answer
16 views

What type of attack could this be ? (Wireshark pcap) [closed]

If I understand it correctly the "client" sent an unencrypted password to the pop3 server consisting of a long string of As. Is this a type of attack and if yes, how does it work?
0
votes
2answers
23 views

How is this tool called for sorting out wires on newly installed patch panels?

I've lost my tool I use frequently. Since I don't know the name for the tool I am having a hard time to find a replacement. How is above tool called? It is meant for patch panels to correct faulty ...
0
votes
2answers
26 views

Unable to ping but I can see the arp in switch 4451

Recently I got to know that I am unable to ping the IP addresses behind vlan236 from core1 whereas I am able to ping the same from core2 and able to ping the IP address of vlan236 from my laptop as ...
0
votes
1answer
46 views

How can i make every network on this topology speak together?

i'm working on this topology for so long and i didn't manage to make every network speak together with different VLAN on each network. On this topology: When i trace a packet sent from PC3 to PC4, ...
0
votes
1answer
26 views

%Cannot create sub-interface

I'm trying to connect 4 networks with 1 router, i created 2 sub-interfaces in the router, when i tried to create the 3rd sub-interface i got this output "%Cannot create sub-interface", this ...
0
votes
1answer
50 views

Trunking multiple VLANs into a single trunk port on a 3650 Switch

Morning: I'm new to the world of Cisco Packet tracer, and I am creating a network for a uni project. So far, what I have is: 5 VLANs (subnetted to 192.168.2.0/26, 192.168.3.0/36 etc) All are ...
-1
votes
1answer
32 views

Port Channel issue on Cisco gear

I have a lab where I'm connecting a Cisco CSR1000V and a Nexus 9000 switch. These devices are connected back to back. Relevant configuration is: Router: interface Port-channel1 mtu 9216 ! interface ...
0
votes
0answers
15 views

F5 Load Balancer Config

Can someone please share steps to configure F5 for the below scenario: Between Web and Application server, there is OAuth 2.0 setup and bearer tokens are not distributed across Application Servers. So ...
0
votes
2answers
50 views

Couldn't connect 2 networks in a single router

I made a topology which has 2 separate networks connected to a router, each network has 1 switch and 2 pc's. I took a screenshot of the topology: https://i.gyazo.com/f99231fc75a41faa3ccd0315859fd84f....
0
votes
1answer
32 views

Router and layer 3 switches RIP

Ok so newb question: If I connect the layer 3 switches in each building together, which also link to the internal router, does RIP need to be configured on the layer 3 switches and the router, or just ...
0
votes
0answers
12 views

What's the role of the AF entity in LTE network?

An AF entity is necessary for example to create a dedicated bearer, but I don't understand what it really does, and why is it necessary for this creation ? Thanks,
0
votes
1answer
19 views

Does Telnet need to be activated on both devices I am using or not? [closed]

I've searched everywhere for the answer to this question but can't find a simple yes or no. Basically, I have a virtual server hosting some services and then a physical panel PC in another part of the ...
0
votes
2answers
73 views

I still can't understand how routers work

I've seen a topology that has 1 router for each network, for example: Network1: 192.168.1.0 192.168.1.2/24 PC1 -> 192.168.1.3/24 PC2 -> 192.168.1.5/24 SWITCH -> 192.168.1.1/24 ROUTER 192.168....

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