bgp.tools February 2023 Changelog
Welcome back to the 2nd monthly changelog for the site! Not a huge amount has happened this month as I’ve been juggling a few different things outside of bgp.tools. But here are the notable changes that you may find useful:
If you are a network with downstreams, you likely give your upstreams and/or peers a IRR AS-SET to build filters from. AS-SETs can include other AS-SETs, this handy feature has some downsides in that one of your downstreams AS-SETs can accidentally include far too much.
bgp.tools now offers monitoring for AS-SETs, Telling you when they are too large. Since large AS-SETs may be refused to be built by some peers/upstreams. Causing serious problems to your connectivity.
Keep an eye on this space for more AS-SET/IRR features soon!
Before now, if you had tried to search for a prefix that was not in the global routing table, you would have been presented with a generic 404 page. Now using RouteViews you can now get historical data on when the prefix was last seen, all the way back to 2001!
Sometimes the Connectivity tab is huge, To save you all the scrolling, you can now click the “Peers”/“Upstreams”/“Downstreams” links and the page will jump to that section for you.
The front page shows 3 different bits of information about how you are connecting to bgp.tools, First is the IP you are connecting from, then the other address family (IPv4 vs IPv6) and then finally what DNS resolvers you seem to be using.
This works by trying to encourage your DNS resolver you are using to send as many different queries as possible to bgp.tools without failing the request.
As an additional feature, if the DNS resolver you are using sends RFC7871 EDNS0 ECS data, then the resolver will show up with a “[ECS]” tag that you can hover over to see what the subnet was sent.
This can be very useful when sanity checking the behaviour of a client’s DNS resolver, or if you are looking to check if ECS is being sent for privacy reasons.
There are still capacity problems with enabling some new feeding sessions. Hardware has however been ordered and should be installed sometime during February. After that sessions will be slowly de-zombied.