LAN Port TCP 
The Network DNA
JUNE 19, 2024
CCNA: TCP Sequence & Port Number This article can be read as the second part of the previous article CCNA: 3-Way Handshake where we discussed what makes TCP a reliable protocol for transmitting information. Lets discuss the TCP SEQ and Port numbers in this article. Port Numbers range from 1 to 65535.
The Network DNA
JUNE 17, 2024
CCNA: TCP 3-Way Handshake In this article, lets take a look at TCP three-way handshake and other useful information that makes TCP a reliable communication protocol. Before TCP can send any traffic, it first contacts the other device and establish a reliable and controlled connection. Now actual data transfer happens.
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Network Engineering
JANUARY 15, 2025
I have a TCP server running on my Ubuntu gateway computer at 10.0.0.1:8080. My Wi-Fi is connected to the gateway's LAN (enp4s0) port, and my modem is in bridge mode and plugged into enp3s0. I can tell the service is working correctly because when I use curl -x 10.0.0.1:8080
The Network DNA
JULY 16, 2024
A switch forwards the broadcast out all the ports in same VLAN (except the port where broadcast was received). To do that it builds the Ethernet Frame and puts its MAC address as the Source MAC address (SMAC) and layer 2 broadcast address (ff:ff:ff:ff:ff:ff). All hosts in same VLAN received this ARP request including PC-2.
The Network DNA
JUNE 24, 2024
This table is populated automatically when a switch receives a frame on a port. As a frame is received on a port, its source MAC address is noted. The switch receives the frame from PC-1 that contains the MAC address 80::01 on port 1. Port 1 is configured as a member of VLAN-11. Then PC-1 wants to communicate with PC-2.
Kentik
JANUARY 13, 2021
Send these pings using the Internet Control Message Protocol (ICMP) or TCP to one or any of the devices you believe to be involved. In some cases if ICMP is filtered, you can usually switch to TCP (Transmission Control Protocol) and use tcping, telnet, or another TCP-based method to check for reachability.
CATO Networks
SEPTEMBER 11, 2023
With Catos LAN Firewall policy, you can configure rules for allowing or blocking LAN traffic directly on the Socket, without sending traffic to the POP. Figure 3 – LAN Firewall Policy When to use a LAN firewall policy There are several scenarios in which it could make sense to apply a LAN firewall policy.
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