Articles in Networking | UserComp.com

Solving Issues with Dual Router Topology: Separating ISP-Provided Cable Modem and Router

Learn how to improve network performance by separating your ISP-provided cable modem and router using a dual router topology. Solve issues with limited functionality and outdated hardware.

Understanding the Purpose of TEST-NET-1, TEST-NET-2, and TEST-NET-3 in Networking

In networking, the TEST-NET-1, TEST-NET-2, and TEST-NET-3 blocks are reserved for specific purposes. This article explains their significance, referring to RFC 5737 for more details.

Maximizing IP Devices on a Gigabit Managed Switch for 974 IP-based Doors

Learn how to maximize the number of IP devices connected to a Gigabit managed switch in a large corporate environment with 974 IP-based doors.

Communicating Across Network Segments: Find B's IP Address

Two hosts, A and B, are connected via a router using Ethernet. The IP address of host A is 192.168.3.100, but the IP address of host B is unknown. In order to communicate between the hosts, you need to find B's IP address. This article provides steps to identify the IP address of host B.

Understanding Primary, Secondary, and Tertiary Networks with Different Subnet Masks

Learn how to configure and manage primary, secondary, and tertiary networks with different subnet masks. This article explains the concept of subnetting and provides steps for setting up your home network with a WAN router.

Remote IP Port Forwarding: Accessing Local Server Remotely with Public IP

Learn how to set up remote IP port forwarding to access a local server using a public IP. This guide covers the process for various operating systems, including Linux, Windows, and MacOS.

IPv6 Firewall Rule: Allowing Public Access to Two Different Web Servers (Ports 80 and 443)

This article explains how to create a firewall rule in Unifi Security Gateway to allow public access to two different web servers using IPv6 protocol and ports 80 and 443.

Does L2VPN Actually Work? Understanding Layer 2 VPNs in the OSI Model

L2VPN, or Layer 2 Virtual Private Networks, are a popular choice for businesses seeking secure and efficient network connections. But do they actually work as intended? Let's explore the basics of L2VPNs and their role in the OSI model.

Successful Boot of Arista Switches with Programmed Bounce Ports in Power Outage Restoration

In the event of a power outage that results in a large number of offline devices, it is believed that the cause of some devices failing to boot may be an Arista switch with the slowest devices booting. This issue can be resolved by programming bounce ports.

CGNAT and Direct Connections: A Workaround with VPC for IPv4 Addresses

When your internet provider uses Carrier Grade Network Address Translation (CGNAT), direct connections via IPv4 addresses become impossible. In this article, we discuss a workaround using a Virtual Private Cloud (VPC) to enable IPv4 connections.

Making Home Server Accessible to Internet: Unsuccessful Attempts

This article discusses the unsuccessful attempts to make a home server accessible to the internet despite configuring SSH, enabling firewall rules, and other necessary steps.

VPN and LAN Switching: Setting Up a VPN with Multiple Routers and 100+ Hosts

Learn how to set up a VPN with multiple routers and 100+ hosts on a LAN using a fibre optic connection. This guide covers configuring a Huawei VPN router for DHCP and connecting to your ISP's regular internet router.

Connecting to an FTP Server in Multiple Subnets using an ISP-Provided Router

This article explains how to connect to an FTP server located in multiple subnets using an ISP-provided router with an inbuilt FTP server function.

Understanding the Difference: Ethernet vs. Type-Ether

In the realm of computer networking, Ethernet and Type-Ether are often used interchangeably, but they have distinct differences that can impact performance. Let's explore the nuances of each.

Setting Up a Guestbook with IPv6: A Simple Way for LAN Users to Connect

Learn how to set up a guestbook on your local network using IPv6 addresses. This article provides a step-by-step guide to configure your router settings and DNS forwarding for a seamless experience.

Reach Network Devices Via WiFi or Ethernet: A Comprehensive Guide

Learn how to reach network devices using both WiFi and Ethernet connections. This comprehensive guide covers various devices such as Win10 laptops, Fritzbox6590, Cablerouter, SynologyDS218j, and TP-Link powerline adapters.

Configuring IPv6 Local Loopback Address: 2a00:da10:f218:9ff0::1/80

This article explains how to configure the IPv6 local loopback address 2a00:da10:f218:9ff0::1/80. Learn how to set up this address on your system and display it correctly.

Configuring Public IPv6 Address 2a00:da10:f218:9ff0::1 for Local Loopback

This article explains how to configure a public IPv6 address (2a00:da10:f218:9ff0::1) for use in local loopback mode, as shown in the provider interface: 2a00:da10:f218:9ff0::1/80. Follow the steps below to set up this IP address for local use.

Understanding IP Addresses: Accessing Hosts in Two Different Subnets

Learn how to grant access to a host with an IP address in one subnet to another host in a different subnet using TCP/IP protocol.

NAT Configuration for Multi-OS Network: Linux, Windows, and POS

Learn how to configure Network Address Translation (NAT) for a multi-computer network with a Linux PC, a Windows VM, and a POS system.

Configuring Mirror Ports on Extreme Switches for IDS Environment

Learn how to configure mirror ports on Extreme Switches for Intrusion Detection Systems (IDS) environment. This guide covers the process of deploying an IDS with Extreme Switches requiring mirror port configuration.

Troubleshooting Network Cat Communication Between Linux and Windows Computers

This article provides solutions for enabling network cat communication between a Linux and Windows computer. While both systems can connect via Ethernet, one (Windows) refuses to send or receive data.

Calculating Bandwidth in Computer Networks: Understanding the Difference between Upper and Lower Frequencies

Learn how to calculate bandwidth in computer networks by understanding the difference between upper and lower frequencies. Discover the importance of frequency ranges in network communication.

TPLink Archer C2 AC750: Unable to Ping Router External - A Solution

This article explains a solution for the issue of being unable to ping the external IP address of a TPLink Archer C2 AC750 router. The problem, which has been ongoing for several months, is characterized by a 'Request timed out' error message.

Setting Up a Business Wi-Fi Network: Allow Internal Access Only

Learn how to configure a Business Wi-Fi network to allow internal access only, preventing users from accessing the internet.

Setting Up One Router for Two Subnets: A Beginner's Guide

Learn how to set up a router for two separate subnets, allowing two different LANs to connect. This beginner-friendly guide covers the basics of routing and IP addresses.

ICMP Type 3 Code 4 Demo: Handling Traffic with Higher MTUs

In this demo, we explore a situation where an instance receives an ICMP Type 3 Code 4 reply when trying to accept traffic with a higher Maximum Transmission Unit (MTU). We will be using two Linux instances running on Amazon Web Services (AWS) to illustrate the concept.

Can't MacBook Access IPv6 Address on Windows PC?

Learn how to resolve the issue of a MacBook not being able to access an IPv6 address on a Windows PC. This guide covers the basics of IPv6 and provides simple steps to configure your devices.

Solving Problems with Proxy Servers: A Workaround for ISP Router Configuration in Squid

This article provides a workaround for users who encounter instability when setting up a proxy server (Squid) and are unable to configure their ISP router. Two methods are suggested: using Firefox settings to enter exceptions or manually configuring the router.

Cloud Management: Routed Devices Connected to Router EVE-NG - Troubleshooting Ping Issues

Experiencing ping issues with devices connected to an EVE-NG router in a cloud environment? Learn how to troubleshoot and resolve the problem.

Specifying Allowed IP Addresses for Device Access on ZTE Wireless Modem

Learn how to specify a list of allowed IP addresses for device access on a ZTE wireless modem.

Troubleshooting Packet Loss in an Internal Network with Cisco-Managed Switch and Virtual Machines

Learn how to diagnose and resolve packet loss issues in an internal network with Cisco-managed switch and multiple physical servers running virtual machines.

Preventing Client IPs from Connecting: PPPOE Clients

Learn how to prevent specific client IP addresses from connecting to a server using PPPOE (Point-to-Point Protocol over Ethernet) clients.

Troubleshooting Destination Port Unreachable Error in Local Network

Learn how to troubleshoot the Destination Port Unreachable error in a local network with computers A, B, and C connected via Ethernet and wireless.

Configuring RADHCPv6 to Provide DNS Servers: A Tech Support Guide

Learn how to configure RADHCPv6 to provide DNS servers for your devices, bypassing ISP DNS servers and caches. Follow our step-by-step tech support guide.

DMCA Notice: IPv4 Destination Address Mismatch on Home Router

A DMCA notice was received indicating BitTorrent packets with IPv4 destination address 97.118.208.52 were received by the home WiFi router, despite the IPv4 address time stamp suggesting otherwise.

DMCA Notice: IPv4 Destination Address Mismatch on Home Router

A DMCA notice was received indicating BitTorrent packets with IPv4 destination address 97.118.208.52 were received by the home router, despite the IPv4 address time stamp suggesting otherwise.

Understanding Extra Flags Discarded in TCP Exchanges

This article explains what extra flags discarded in TCP exchanges mean and how they affect the normal handshake process.

Understanding IPv4 Route Table and '127.0.0.1' Belonging to Interface/Adapter

In this article, we will discuss the IPv4 route table and the significance of '127.0.0.1' belonging to the interface or adapter. We will also explore the active routes in detail.

LAN Networking: Local DNS Name Not Working in Windows Browser for Ubuntu Home Server 'lenovo'

A user reports that their Ubuntu home server named 'lenovo', which runs a few HTTP servers accessible on the home LAN, is not resolving the local DNS name in the Windows browser. This article provides a suggested solution.

Asus Router: Unexpectedly Open Ports in Port Forwarding Log

During a routine check of the logs in an Asus router, an unexpected discovery was made: two open ports in the Port Forwarding section. This article explains what this means and how to address the issue.

Troubleshooting Traffic Forwarding with Multiple Machines on a LAN

In a LAN environment with multiple Linux machines deploying web-service backends, investigating network traffic using tcpdump can reveal performance issues. This article explains how to diagnose and resolve traffic forwarding problems.

Syncing Files Between Devices on the Same WiFi Network: Is There a Specific Network Interface to Use?

When transferring files between devices connected on the same WiFi network, users may encounter slow transfer speeds. This article explores the possibility of using a specific network interface to improve file transfer performance.

Obtaining 1000 Private IP Addresses in a VPC with a /22 CIDR Block

Learn how to obtain 1000 Private IP addresses in a VPC using a /22 CIDR block with a netmask of 255.255.252.0 and a base IP of 192.168.0.0.

Central Server: Sending Messages to Clients with NAT Traversal using RFC

A hobbyist wants to know if they can set up a central server on DigitalOcean to send messages to clients using NAT traversal and RFC. This article explains the process.

Understanding the Evolution of L3 Layer: From IPv4 to IPv6

This tech support article explores the evolution of the L3 layer in networking, focusing on the transition from IPv4 to IPv6. Discover the significance of this change and its impact on network performance and security.

Understanding PTK and GTK in Encrypted Multicast Traffic

PTK (Pairwise Transient Key) and GTK (Group Temporary Key) are used to encrypt and obtain ciphertext for multicast traffic during a 4-way handshake. Let's explore their roles in detail.

Forwarding Custom Domain Traffic IP Behind NAT with Wifinity Networks

Users of Live University Residences' internet connection provided by Wifinity Networks may need assistance in forwarding custom domain traffic behind a NAT. This article explains the steps to configure port forwarding in the Wifinity router.

Communicating Two Subnets: ISP Modem Router (Huwawei EG8145V5) and Xiaomi AX3000

Learn how to configure and communicate two subnets using a Huwawei EG8145V5 ISP Modem Router and a Xiaomi AX3000 router. This tech support article covers setting up the LAN and WAN ports and establishing a connection between the two networks.

How Do NAT Rules on One Computer Affect Traffic on Another?

Learn how NAT rules on one computer can impact traffic on another when both are connected behind a router.