The first time I used Ethernet, I was completely unprepared.
I had no idea what was happening and was so overwhelmed that I had to go back to my computer and redo my whole setup.
That was my first time using a router and it was one of the first times I really had to be sure that I understood the rules of the network.
This post is going to focus on how I implemented a router using the standard Ethernet specification and its rules, and how I used it to protect my home from network attacks.
I’ll also talk about how to configure the router to support multiple interfaces.
Network Basics First, let’s get to the good stuff.
Ethernet is a standard, ubiquitous network technology that is widely used today in home, enterprise, and government networks.
In the next section, I’ll go over the basics of how to use Ethernet to build a wireless router and to manage multiple interfaces using the same configuration.
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For now, let us dive right into the details.
How does Ethernet work?
Ethernet uses a protocol called Ethernet Control Protocol (ECP) to transfer data.
Ethernet uses a series of rules that determine how data is sent and received.
First, Ethernet packets are transmitted using a special type of protocol called a Control Sequence Number (CSN).
This is the number of the control sequence number (CSNs) that the packet has to follow in order to transmit.
Each control sequence has a number of bytes that tell the packet where to send data.
In a typical Ethernet packet, there are five control sequence numbers (CSNS).
Each control number is numbered from 1 to 255.
The number in the middle represents the lowest CSNS number in that control sequence.
Next, Ethernet frames are sent from the network to the computer or device that is connected to it.
Ethernet frames use the control numbers to tell the computer to send the appropriate control code.
For example, a Ethernet frame has one control number and one control byte, and so on.
The control code is a control sequence that specifies what the packet should do in the context of the Ethernet connection.
A control sequence is encoded in a 32-bit field called a CCSN.
Each CCSNs consists of two 16-bit numbers, which are used to encode the control codes.
The 16-bits of a CNSN are the Control Sequence numbers (CNSNs), the control byte sequence number, and the control number.
In general, a control code can only be set once and is only valid for one Ethernet frame.
Control codes can be set with any number of Ethernet frames and with different values of CNSNs.
In most cases, Ethernet Ethernet frames have the same control code as the frames they were sent from.
In addition, Ethernet frame packets can be received using any control code set with a previous Ethernet frame, and they can be sent using any other control code from the previous Ethernet frames.
The Control Sequence Numbers (CnsN) and Control Code Sequence Numbers are used in many Ethernet protocols.
Once a control number has been set, the next step is to send control codes to the next Ethernet frame that matches the control code sequence number.
For a typical network of Ethernet devices, Ethernet network packets send control numbers and control bytes using the following three methods: TCP (TCP/IP) UDP (UDP/UDP) and HTTP (HTTP/1.1).
TCP packets send Control Numbers to the device connected to the network in the following order: TCP – The TCP header, TCP/IP header, and TCP/UPDT header are all in the same byte order.
UDP – The UDP header is not in the byte order as TCP packets are sent, but it is a byte order extension of the UDP header.
TCSP – The Control Sequences Number (CssN) is a 16-byte value in the first byte of the TCP header and is not part of the IP header.
If the TCP packet has an extension, it is encoded using the Extension Packet Header (EPH) or Extension Sequence Number Extension (ESN) (TCMP) (see Figure 1).
Udp packets send a Control Code to the Ethernet device connected by TCP or UDP packets.
The CssN in the second byte of a UDP packet is the control parameter, and it specifies the control that will be transmitted.
For TCP packets, the Control Code (CC) and CSN in a UDP header are both set to zero.
If a Control Number (CTN) or CSN is set to a value greater than zero, it indicates that the TCP or TCP/DNS protocol does not support a control response.
In the TCP/DSS protocol, Control Code sequences are encoded as a 32 byte field called the Control Sequence Number (CsN