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Dear Mr. Meowski, > This is called multi-homing and is explicitly not an advised configuration > unless you have very specific requirements and know what you're doing. > A better way to approach this might be to ask what specific aim you are > hoping to achieve by having two simultaneous network connections into the > same subnet on a single instance? If there is no answer, you shouldn't be > doing it. "Redundancy" is not a valid answer in this scenario, you'd need > bonding or LACP for that along with a switch that supported it. Thanks for the keywords: it is very helpful when researching things to know what they are called! The 'redundancy' in this case was to be able to use one interface if the other went down. When this problem started this was OK, but as I said the issue has become progressively worse over the last few months, and now even that does not usually fix it. If there is any speed improvement with using two interfaces then that would also be nice. However, I don't think the Powerline by itself would be a bottleneck, so it would be quite fine to just use that. > If you want the easiest fix just pull the wifi card and reset the ethernet > completely, removing all your weird and incorrect configurations from it. Well that was certainly easy, but I'm not so sure about the 'fix' bit! I've deleted all the NetworkManager connections, unplugged the wireless adapter and rebooted Fedora with only the Ethernet plugged in, with the router already on. Sadly, this was clearly insufficient, because later on yesterday I got the problem again. I pinged both 1.1.1.1 (Cloudflare) and 192.168.1.254 (the router's IP address) but both of these failed with "Destination Host Unreachable". I also tried a ping to duckduckgo.com and the DNS lookup failed (I have two nameservers in /etc/resolv.conf, firstly Cloudflare and then OpenDNS). Thank you for your help. The mystery continues! Best wishes, Sebastian -- - Freenode: 'seabass' - Matrix: '@seabass:chat.weho.st' -- The Mailing List for the Devon & Cornwall LUG https://mailman.dcglug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq