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Hi, I'm Iljitsch van Beijnum. These are all posts about IPv6.

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IPv6 is faster than IPv4 on US mobile networks

At the NANOG meeting in San Francisco two weeks ago, there was a session on The benefits of deploying IPv6 only. Someone from T-Mobile explained that the latest Windows Mobile and Android support 464XLAT to allow IPv4-only applications to work over IPv6 with NAT64, so those devices now only get IPv6. Other devices only get IPv4, there's no dual stack. At that point, the panelists didn't know yet that Apple is requiring iOS 9 apps to work over IPv6 so those can work through NAT64 without 464XLAT.

Another interesting data point is the observation by Facebook that IPv6 tends to perform better than IPv4, with the margin being as large as 40%:

However, why this is is unclear: the RTTs are the same, yet the performance/bandwidth over IPv6 is better. There was some frustration because Apple's implementation of "happy eyeballs" only looks at the RTT to choose between IPv4 and IPv6, and thus lands on IPv4 a good deal of the time and doesn't enjoy the benefits of that better IPv6 performance.

Permalink - posted 2015-06-17

→ Apple to iOS devs: IPv6-only cell service is coming soon, get your apps ready

During last week's WWDC, Apple announced that it will start requiring iOS 9 apps to support IPv6. The reason for this is that cell carriers want to move from dual stack to IPv6-only cellular data service, with NAT64 to let users reach IPv4 destinations. This only works if apps use IPv6-compatible APIs and don't do things like checking for the availability of (IPv4) internet connectivity or using IPv4 addresses directly, rather than DNS names.

The article links to a WWDC video that explains all of this in detail, and then continues with some other very interesting information on network performance issues, including the fact that Apple is turning on Explicit Congestion Notification (ECN) in the new versions of MacOS and iOS. Microsoft tried to do the same thing in Vista, but had to turn it back off because too many firewalls blocked packets with ECN. Hopefully that's no longer an issue seven years later.

Permalink - posted 2015-06-16

→ IPv4 Transfers in the RIPE NCC Service Region

Earlier this month, RIPE Labs had a lengthy blog post about transfers of IPv4 addresses within the RIPE region. A lot of addresses went from Romania to Saudi Arabia, but the rest of Europe and the Middle East has been busy, too. However:

In the subsequent months of January 2015 through to April 2015, levels of transfer were significantly lower. Because the RIPE NCC listing service continues to show strong demand, the lower amounts transferred may well be a sign that the market in the RIPE region is capped by availability; total demand cannot be met by available supplies. This may change after the recently accepted RIPE policy for inter-RIR transfers has been implemented.

It probably wasn't an accident that two of the sponsors of the RIPE-70 meeting were businesses that facilitate IPv4 address trading.

Permalink - posted 2015-05-28

Documentation ASNs and IP prefixes

As you may have noticed, I write about BGP from time to time. When coming up with example configurations, there's always the challenge of which AS numbers and IP addresses/prefixes to use...

Full article / permalink - posted 2015-04-24

IPv6: to firewall or not to firewall?

Yesterday I wrote about my new printer, which supports IPv6. I posted a photo on Twitter with the printer's IPv6 address, and before long people attempted to print over the internet. Eventually, two succeeded.

I'm not very happy that Canon allows this by default, and doesn't give you any way to block this other than to disable IPv6 or put the printer behind a firewall.

Here's another link to that part of the story, as the title I used yesterday doesn't mention IPv6 or firewalling.

Permalink - posted 2015-03-04

The Canon PIXMA MG7550 and the state of printers in 2015

Today, I bought a new printer: a Canon PIXMA MG7550...

Full article / permalink - posted 2015-03-03

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