Articles about networking | UserComp.com | Page [ 11 ]

Troubleshooting Weird Network Issues: Local Network and Internet Connection

Resolve intermittent disconnections and failed requests by systematically isolating local hardware faults, correcting DNS settings, and performing proper router power cycles.

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Ethernet Interface Using Static Address Ignoring Defaultroute Provided by DHCP Server

Resolve loss of external connectivity on Ubuntu by manually adding a default gateway to Netplan static IP configurations.

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Discovering Active Network Connections with PowerShell

Resolve network connectivity issues by identifying active TCP sessions and their responsible processes using Get-NetTCPConnection.

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Connecting PC ethernet port to WAN port of router

Explains why connecting a PC to a router's WAN port fails and clarifies the correct use of LAN versus WAN interfaces for standard internet access.

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Port Forwarding with Different IP Addresses and Network Interfaces

Configure port forwarding across distinct network interfaces and IP addresses using iptables or nftables to route external traffic to specific internal hosts.

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Traffic Not Passing OPNsense Firewall in Hyper-V: Troubleshooting Steps

Resolve OPNsense firewall traffic issues in Hyper-V by fixing virtual switch bindings, VLAN tags, and interface assignments.

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Which ports are used by browsers in peer-to-peer screen sharing?

Explains why browsers use dynamic ephemeral ports instead of static ones for peer-to-peer screen sharing to ensure NAT traversal and firewall compatibility.

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Configuring Pfsense LAN Interfaces on VMware Workstation for Windows

Resolves pfSense LAN interface connectivity issues on VMware Workstation by configuring VMXNET3 adapters, assigning static IPs, and enabling DHCP.

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NIC Intermittently Receiving Many Duplicate TCPACKs: Troubleshooting HTTP Traffic Spikes

Resolve intermittent HTTP traffic spikes and latency caused by network interface cards receiving excessive duplicate TCP ACKs due to WiFi interference, driver bugs, or MTU misconfigurations.

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How to Setup Ethernet Connected Computer as Gateway

Enables local devices to access the internet through an Ethernet-connected computer by configuring IP forwarding and NAT.

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Configuring WireGuard VPN Routes for Network Application on Binded Network Interface

Resolve routing conflicts for applications on binded interfaces by using policy-based routing to send specific traffic through WireGuard while preserving default gateway access.

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How to Fix Stuck Download Speed at 10MB

Resolve download speeds stuck at 10MB/s by checking Ethernet cable categories, Wi-Fi band connections, and disabling OS or antivirus bandwidth limits.

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Setting up OpenVPN Connection between Two PCs behind a CGNAT Cloud Server

Bypasses CGNAT restrictions to establish a direct OpenVPN tunnel between two PCs by routing traffic through a public VPS hub.

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Setting Up New OPNsense with Almost Default Config and DNS Access Sites on Protected Laptop

Configure OPNsense LAN DHCP and Unbound to provide local DNS resolution for protected devices without external dependencies.

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WAN Passthrough with Managed Switch: A Good Idea for ISP-Provided GPON?

WAN passthrough with a managed switch exposes the network to security risks and causes IP conflicts by bypassing router NAT on ISP GPON connections.

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Minecraft Server over PPTP: Client suddenly disconnects

Resolve Minecraft server disconnects over PPTP by adjusting the MTU to account for tunnel overhead.

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Understanding RFC1918 Private IP Address Ranges

Explains RFC1918 private IP ranges 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 to solve IPv4 exhaustion and enable secure internal networking via NAT.

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Can Calls Executed Behind the Scene Open UDP Socket Port 7500 in Java?

Resolve unexpected UDP port 7500 usage by identifying hidden Java library bindings and tracing the responsible process.

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Standard Protocols to Advertise Alternative Internet Gateways to Local, Already DHCP-Configured Network

Explains why standard protocols cannot advertise multiple default gateways to DHCP clients and clarifies that network layer redundancy requires application-layer solutions.

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Which Wi-Fi6 features are mandatory?

Clarifies that Wi-Fi 6 certification mandates uplink OFDMA, Target Wake Time, and the new PHY preamble while excluding features like BSS Coloring.

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How to Host a Local Server for Android Applications on Ubuntu

Configure Apache on Ubuntu to serve local backend services accessible by Android emulators or devices for testing without external hosting.

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How to Create a Private WiFi Network on a Shared Apartment Network - Being Blocked Somehow?

Resolve being blocked on a shared apartment network by configuring DD-WRT in Repeater Bridge mode to isolate traffic and bypass MAC filtering.

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Windows 'ping IP' Uses Wrong IP Address: A Troubleshooting Guide

Resolve Windows ping returning wrong source IP by adjusting network interface metrics and clearing DNS cache.

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Troubleshooting: Pinging Self via Gateway - Connection Issue

Resolve ping failures to local IP via gateway caused by asymmetric routing or firewall blocking loopback traffic on external interfaces.

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Troubleshooting WiFi Router Disconnects When Away from Home

Resolve WiFi router disconnects during remote access by updating firmware, optimizing wireless channels, and disabling aggressive power management on client devices.

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Making a Virtual Internal NAT Switch Work for Hyper-V VMs

Resolve Hyper-V VM connectivity issues by configuring a virtual internal NAT switch to enable private inter-VM communication and controlled external access.

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Routing Windows Traffic through Linux using Socks Proxy

Route Windows traffic through a Linux Socks Proxy via SSH dynamic port forwarding and system-wide proxy configuration.

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Understanding the Evolution of L3 Layer: From IPv4 to IPv6

Resolve IPv4 address exhaustion and simplify network management by transitioning to IPv6's 128-bit addressing and header optimization.

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Adding a New Route in macOS: Will it Affect Existing TCP/UDP Connections?

Adding a new route in macOS preserves existing TCP/UDP connections by keeping active sockets on their current path, though future packets follow the new route which may cause asymmetric routing issues.

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My Router (TP Link) Not Connecting with Cat6e Cable

Resolve TP-Link router connection failures with Cat6e cables by verifying WAN port usage, inspecting physical cable integrity, and configuring PPPoE settings.

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Setting up a NAT Server in Hetzner Cloud: Step-by-Step Guide

Resolves the inability of Hetzner Cloud VMs without public IPs to access the internet by configuring a NAT gateway with private networking and iptables masquerading.

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How to Access LAN Subnets from Other Subnets with Interzone Firewalling on the Same Router

Resolve blocked inter-subnet traffic by configuring static routes and explicit firewall allow rules between security zones.

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Understanding Different Interface Responses in Linux

Troubleshoot Linux Ethernet interface states like no carrier or link down in Yocto embedded systems.

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Forwarding www traffic through a remote computer

Route web traffic through a remote Linux server using SSH dynamic port forwarding to encrypt requests and mask the local IP address.

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Diagnosing and Resolving Network Latency Issues in Python Applications

Resolve network latency in Python apps by optimizing socket configurations, enabling persistent HTTP connections, and implementing asynchronous I/O.

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Route Traffic with Special Source/Destination on Ubuntu: A Tech Support Guide

Configure policy routing on Ubuntu to direct traffic from specific source IPs through designated gateways using custom tables and ip rule commands.

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Understanding the Effectiveness of 'networkingMode=mirrored' in Win11 WSL2

Clarifies that networkingMode=mirrored is not supported in WSL2 and explains the actual NAT-based networking architecture.

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Hiding Public IP Address with Free Dynamic DNS: A Comprehensive Guide

Clarifies that Dynamic DNS does not hide public IP addresses and explains how to use VPNs, Tor, or proxies for true anonymity.

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Troubleshooting DstNat Address Changes with No Response from Recipient

Resolve silent failures in DstNat where recipients do not respond due to asymmetric routing, missing reverse NAT rules, or connection tracking errors.

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How to Conduct a T-Mobile Home Internet Speed Test for Maximum Speed and Reliability

Resolve T-Mobile Home Internet performance issues by conducting standardized speed tests to verify download, upload, and latency metrics against plan benchmarks.

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Monitoring Internet Connection from Coaxial Cable into Modem

Diagnose intermittent internet drops and reduced speeds by monitoring downstream/upstream power levels and SNR at the coaxial cable entry point.

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Possible Connection: Router 1 to Router 2

Configure static routes and proper subnetting to resolve latency issues when Router 1 accesses Router 2's intranet.

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

Resolve Windows inability to access Ubuntu server by hostname via LAN by installing and enabling the nmbd service for NetBIOS name resolution.

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Maximizing the Number of Subnets: Understanding Subnet Bit Calculation

Calculate the maximum number of subnets by determining borrowed bits using 2^n to balance network segmentation against host capacity.

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Pinging One Interface on Linux

Resolve ambiguous routing on multi-homed Linux servers by binding ping traffic to a specific interface or source IP using the -I flag.

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Troubleshooting SSH Connection Issues from External IP Address

Resolve SSH connection failures from external IPs by fixing router port forwarding, handling WSL networking, and configuring local firewalls.

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DNS Server: Resolving Internal Domain Names to No Hosts

Resolve internal domain name lookup failures returning No Hosts errors by verifying zone records, serial numbers, and forwarder configurations.

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Dell Latitude E6540 Stuck in Airplane Mode

Resolve Dell Latitude E6540 stuck in Airplane Mode by resetting network settings, reinstalling wireless drivers, and checking hardware switches.

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Enabling Communication Between Two Subnets in a Home Office: Connecting Two Routers

Resolve double NAT issues to enable direct communication between devices on two subnets by configuring the secondary router as a switch.

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Unable to traceroute but able to ping

Resolve traceroute failures when ping succeeds by adjusting firewall rules to allow UDP or using TCP-based tools like tcptraceroute.

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