I've just finished rebuilding my NAS, now using an Intel-based SBC with two Realtek ethernet ports (Odroid H2 for those interested). Everything worked fine so far, up until I tried to use both ethernet ports in a bridge to maximize local network bandwidth (this NAS will be used to stream multiple 4K streams locally).
Setup of hardware is simple: the H2, with a 256GB NVMe SSD in the M.2 slot, two HDDs connected to the two SATA ports, and the two ethernet ports are slotted on my router's (HyperOptic's modem+router combo Tilgin HG2381) first two LAN ports.
Software-wise it's also simple: regular Ubuntu Server 19.04 install on the SSD, where I store my cloud stuff, Docker's stuff (images, config folders), etc.; and the two HDDs are in a RAID0 array with a single XFS partition for storage of media. Data loss is not a danger, as I do not care much about the content on the HDDs, and the docker configs (the irreplaceable bit) is backed up daily to Google Drive.
cloud-init from the system, and set the netplan renderer to NetworkManager, so that I could use Cockpit's web interface for management of all. Extra networking software installed is zerotier, which I found to be the most simple to set up and manage.
The two separate network interfaces work well, but the device gets two separate IPs. I wish to treat this connection as a single interface with load balancing, so I've created a bridge out of the two and set a static IPv4 address to it. The moment this network configuration is activated, the whole local network dies - WiFi, internet access, local network access, everything. While I do enjoy the discovery of this kill switch, I'd really like to fix it.
The current NetworkManager configs:
Wired connection 1:
[connection] id=Wired connection 1 uuid=8d403f31-b593-38b7-a177-62d26ac8604c type=ethernet autoconnect-priority=-999 master=bridge0 permissions= slave-type=bridge timestamp=1565379408 [ethernet] mac-address=00:1E:06:45:06:C1 mac-address-blacklist=
Wired connection 2:
[connection] id=Wired connection 2 uuid=a440422a-941f-32c0-8863-5b35e3a9cd12 type=ethernet autoconnect-priority=-999 master=bridge0 permissions= slave-type=bridge timestamp=1565379408 [ethernet] mac-address=00:1E:06:45:06:C2 mac-address-blacklist=
[connection] id=bridge0 uuid=c60701c0-12f2-4624-a6d0-4f0ba327445f type=bridge autoconnect-slaves=1 interface-name=bridge0 permissions= timestamp=1565379708 [bridge] stp=false [ipv4] address1=192.168.1.75/24,192.168.1.1 dns=126.96.36.199;188.8.131.52; dns-search= method=manual [ipv6] addr-gen-mode=stable-privacy dns-search= method=auto
At first look I do not see any issue here, however I'm nowhere near even a NetworkManager adept (I'm still familiarizing myself with it, after almost exclusively using /etc/network/interfaces - not many embedded devices have fully blown fancy-pants network management systems, even routers!). Is there something wrong with my network config, or is it the router not handling a bridged interface well?