The first thing the switch would do when receiving the traffic is create a new entry in its MAC address table for PC1's MAC address (PC1 -> Fa0/3). It would encapsulate an Ethernet frame and send it off toward the switch. Now suppose PC1 wants to send traffic to the server that has a MAC address of 00:00:00:00:00:01. In this case, the MAC address table of the switch would be empty (ignoring any system MAC addresses shown in the table by default). Let's assume that all of the devices are powered on but have not sent any traffic. There are also bundles with a 5V/3A or 5V/4A power supply for $91.99 and $98.99 respectively.In Figure 1, a switch is surrounded by a number of common devices.
If you want to order the R4S board with a unique MAC address, you have to place an order with a minimum order quantity of 100 piecesįriendlyELEC is not selling the router or SBC just yet, but should soon in a few days, and we noticed the NanoPi R4SE from sellers on Aliexpress offering the complete router for $85.99 plus shipping (“RS4E-4GB-32GB EMMC” option). [ Update: It turns out the reason for the lack of EEPROM is… supply shortage:ĭue to the shortage of the chip that has a unique built-in MAC address, we no longer list the R4S board with a unique MAC address for retail sales. There’s no mention of EEPROM for the NanoPi R4SE, but that would be nice if it would be included in all boards since it could potentially cause issues for people with multiple FriendlyELEC routers in a LAN.
The standard version lacks this chip and generates a MAC address by software at boot time.
While looking at the wiki for the earlier R4S, I also noticed FriendlyELEC now has NanoPi R4S Standard and Enterprise versions with the latter adding a built-in EEPROM chip (24AA025E48T) to store a globally unique MAC address. We wrote an early NanoPi R4S review with OpenWrt and Ubuntu Core in December 2020, but the company appears to mainly focuses on OpenWrt and supports Docker CE. We don’t have the usual pretty photos from FriendlyELEC since the Wiki is still a work in progress. Dimensions – 66 x 66 mm (8-layer PCB) enclosure: 72 x 72 x 29 mm.RK808-D PMIC and independent DC/DC enabling DVFS, software power-down, RTC wake-up, system sleep mode.
Misc- 1x power LED, and 3x user LEDs (SYS, LAN, WAN), user button, 2-pin RTC battery connector, 5V fan connector, one MASK button for eMMC update.Debugging – 3-pin debug UART header (1,500,000 bps by default).Expansion – 2x 5-pin header with 1x SPI, 1x I2C.USB – 2x USB 3.0 Type-A ports, USB 2.0 via 4-pin header.
The listed temperature range also changed from -20☌ to 70☌ to 0☌ to 80☌. Most of the specifications remain the same with dual GbE, two USB 3.0 ports, but the router is now only offered with 4GB LPDDR4 and there’s no option for only 1GB RAM, and the GPIO and USB 2.0 headers are gone. NanoPi R4SE is a variant of the Rockchip RK3399-powered NanoPi R4S dual Gigabit Ethernet router that adds a 32GB eMMC flash instead of only relying on a microSD card for the operating system.