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Hi, I'm Iljitsch van Beijnum. This page has all posts about all subjects.

Winter wonder land

Image link - posted 2014-12-28 in

iPhone 6 network speed

The iPhone 6's networking can be very fast, but it all depends on the SIMs, Wi-Fi base stations, frequency bands and transfer protocols.

Full article / permalink - posted 2014-12-28

The iPhone 6 as a camera

Although it has a number of limitations, the iPhone 6 camera can take really nice photos.

Read the article - posted 2014-12-27

No Interview on Youtube: the regionlockers win!

The Interview is now available on Youtube.

But of course doing the right thing for free speech, not letting the terrorists win, all that good stuff, takes a back seat to the need to parcel out content piecemeal region-wise:

This video is not available in your country. Sorry about that.

Permalink - posted 2014-12-26

The iPhone 6

I wasn't even sure I was going to get the new iPhone this year, even though I've been upgrading iPhones every other year until now. I liked the long battery life of the iPhone 6+ as well as the 1920x1080 screen—until it turned out that Apple uses some weird scaling tricks rather than the native resolution. And I wasn't sure I could handle the size and weight of the 6+. The 6, on the other hand, didn't seem to come with any must-have features. And maybe it's silly, but the notion of having to replace my iPhone 5 cases and its dock also made upgrading significantly less appealing.

But then the sleep/wake button of my iPhone 5 started to act up, and after the earlier battery replacement, I started to doubt whether I'd get another year of good use out of it. So I got the black space gray 64 GB iPhone 6.

Full article / permalink - posted 2014-12-23

Apparently, SSL generates IPv4 "too bigs"

Yesterday, I wrote:

❝In almost a week, I received zero IPv4 "too big" messages.

So it seems in the IPv4 world, path MTU discovery is dead.❞

However, João Taveira Araújo told me that he sees a good number of IPv4 ICMP "too big" messages. Those seem to result from SSL traffic. At first, that seemed strange, as SSL is just payload for TCP so TCP MSS clamping should work on SSL sessions the same as on non-SSL sessions.

But then I realized that this traffic could be SSL VPNs. If a VPN gateway takes an IPv4 packet and encapsulates that in SSL in a single TCP segment, then the size of those TCP segments isn't influenced by MSS clamping, so too big messages will be generated if the path MTU is smaller than the MTUs of the endpoints of the SSL connection. I wonder if those SSL VPN implementations handle path MTU discovery properly, though.

Permalink - posted 2014-12-19

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