Network update part 1: Custom router with espressobin2018-04-30 [ networking ]
I wanted to replace my pfSense VM with a dedicated router so I could take my homelab offline without losing internet connectivity, so I bought an Espressobin
Get your ram configuration
Connect the espressobin with the supplied micro usb cable and connect to the serial device that pops up. In my case I used
screen to connect to
/dev/ttyUSB0 and got greeted by the following prompt:
... DDR_TOPOLOGY is 4 : DDR3, 1CS 1G ... Model: Marvell Armada 3720 Community Board ESPRESSOBin CPU @ 1000 [MHz] L2 @ 800 [MHz] TClock @ 200 [MHz] DDR @ 800 [MHz] DRAM: 1 GiB ...
Download correct U-Boot image
For my initial testing I wanted to use Debian, but as there is no current image available I'll just use armbian.
Download your image from Here and put it in a FAT-formatted usb drive.
bubt flash-image-MEM-RAM_CHIPS-CPU_DDR_boot_sd_and_usb.bin spi usb, then
dd the armbian image to the same usb drive and run
setenv initrd_addr 0x1100000 setenv image_name boot/Image setenv load_script 'if test -e mmc 0:1 boot/boot.scr; then echo \"... booting from SD\";setenv boot_interface mmc;else echo \"... booting from USB/SATA\";usb start;setenv boot_interface usb;fi;if test -e \$boot_interface 0:1 boot/boot.scr;then ext4load \$boot_interface 0:1 0x00800000 boot/boot.scr; source; fi' setenv bootcmd 'run get_images; run set_bootargs; run load_script;booti \$kernel_addr \$ramfs_addr \$fdt_addr' saveenv
(This all came from here.)
Being able to run
tcpdump on my router allowed me to investigate and map my network. I wrote a script to dectect connections going to the internet and to my 'old' (192.168.1.0/24) network.
I'll come back to this in a post dedicated to monitor the network.