Unable to Access Local Network: Router, Two PCs Acting as DHCP Servers
In a local network connected to the internet, a router is responsible for managing the flow of data between devices. However, when the router decides to turn into a switch, and two PCs (one Windows and one Debian-based) turn on DHCP servers, it can result in network issues. This article will discuss the key concepts and provide a detailed context of the topic, including subtitles and paragraphs, code blocks, and references.
What is a Router?
A router is a device that forwards data packets between computer networks, creating an overlay internetwork. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP's network. Routers perform the traffic directing functions on the Internet. A data packet is typically forwarded from one router to another router until it reaches its destination node.
What is DHCP?
Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on Internet Protocol (IP) networks for automatically assigning IP addresses and other communication parameters to devices connected to the network using a client–server architecture.
Router Turned Switch
A router can act as a switch by forwarding data packets to a specific device on the network based on the MAC address of the device. When a router turns into a switch, it stops routing data packets and starts forwarding them based on the MAC address. This can cause network issues when two PCs are acting as DHCP servers.
Two PCs Acting as DHCP Servers
When two PCs are acting as DHCP servers, it can result in IP address conflicts. Each DHCP server can assign the same IP address to different devices on the network, causing confusion and preventing devices from communicating with each other. This can also result in a loss of network connectivity.
Code Block: Checking for DHCP Servers on the Network
# On Windows:
netsh dhcp server show all
# On Debian-based systems:
sudo service isc-dhcp-server status
Solution
To resolve this issue, it is recommended to disable the DHCP server on one of the PCs and configure the other PC to obtain an IP address automatically. This will prevent IP address conflicts and ensure that the router can properly manage the flow of data packets on the network.
References
- Dynamic Host Configuration Protocol. (n.d.). In Wikipedia.
- Router (computing). (n.d.). In Wikipedia.
Note: This article is not meant to replace professional technical advice. If you are experiencing network issues, it is recommended to consult a network administrator or a professional IT service provider.