5Ghz Here We Come A few months ago I changed my home router from a Mikrotik RB2011 router to a Linksys WRT1900ACSv2 - Not a particularly cheap router, it’s still £ even now. I changed because I wanted 5Ghz wireless as the 2.4Ghz around here is massively congested, plus I wanted some faster speeds for copying photos to my NAS. I’ve got Gigabit wired to most rooms, but I just can’t be bothered to find a cable most of the time to hook up to - I don’t usually have one long enough at home, work tends to stay at work these days.
The Problem When you connect to an internet peering exchange, the IP addresses you’re given for your interfaces will most likely have been used by someone else prior to you, that has left the exchange. This means, because we’re not all good at housekeeping, that you’ll end up with ISPs trying to open up BGP sessions with your routers and if you’re not firewalling them out then you’ll end up with a lot of messages about BGP Opens being received from unconfigured neighbours.
If you’ve gone to edit your site and suddenly found that your chosen IDE won’t connect to upload any more via FTPS (FTP using TLS encryption) and your web host runs cPanel, then chances are they’re running v56 and your IDE is written in Java. I hit this issue with another website late last week, where the DH params had already been re-generated to 2048 bit, but that change removed.