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These are all posts about BGP, including those originally published on BGPexpert.com.

Winner doesn't take all: IPv6 is now a success, even at 25% deployment

We shouldn't gauge the success of IPv6 by looking at how much IPv6 replaces IPv4, but by how much IPv6 complements IPv4. And it's already doing that quite well today by making IPv4aaS (IPv4 as a service) possible. And IPv4aaS will make ISPs require IPv6 when peering with streaming services and other big content providers.

Permalink - posted 2020-01-23 - 🇳🇱 Nederlandse versie

IPv4 now also exhausted in Africa

As of a few days ago, IPv4 has run out in all regions in the world, as AFRINIC, the Regional Internet Registry that serves Africa, has now reached IPv4 exhaustion phase 2.

For more on the IPv4 exhaustion over the last decade, see my story The rise of IPv6 and fall of IPv4 in the 2010s.

posted 2020-01-16

❝Beating BGP is harder than we thought❞

In a paper for the HotNets'19, seven researchers admit that "beating BGP is harder than we thought". (Discovered through Aaron '0x88cc' Glenn.) The researchers looked at techniques used by big content delivery networks, including Google, Microsoft and Facebook, to deliver content to users as quickly as possible. This varies from using DNS redirects to PoPs (points of presence) close to the user, using BGP anycast to route requests to a PoP closeby and keeping data within the CDN's network as long as possible ("late exit" or "colt potato" routing).

Turns out, all this extra effort only manages to beat BGP as deployed on the public internet a small fraction of the time.

Full article / permalink - posted 2019-12-30

Slides: AS paths: long, longer, longest

Presentation slides from my lightning talk "AS paths: long, longer, longest" at the RIPE-79 meeting in Rotterdam, 18 October 2019.

Permalink - posted 2019-11-29

Valid address space, bogons and martians

There are some advantages to filtering out packets with invalid addresses in them. That would be a packet with a private source or destination address, for instance. Those never have any business traveling across the internet. (Not to be confused with BCP 38 filtering.) For instance, there have been instances where spammers grab an unused prefix, start announcing it in BGP, do a spam run and then drop the prefix. When packets with private addresses enter your network, bad things may happen if you use those addresses yourself. And these invalid "martian" packets are just an annoyance, using up traffic and generating log entries.

Full article / permalink - posted 2019-11-28

Routing theory: are link state and distance vector the only games in town?

During his talk about 30 years of BGP, Geoff Huston said something along the lines of "someone should come up with another type of routing protocol besides distance vector and link state". That is of course too delicious a challenge to ignore...

Full article / permalink - posted 2019-10-15

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