Symmetric NAT

Mon, Aug 20, 2012

I almost titled this post “Symmetric NAT considered harmful", except I promised myself I’d never title something “considered harmful." It seems like the number of consumer-level routers on the market that implement symmetric NAT (endpoint-dependent mapping) has been rising in recent years. This paper puts it as high as 16% in 2010 (with another 14% blocking UDP traffic, which, while tangential to this post, is really disappointing). RFC 4787 (Network Address Translation (NAT) Behavioral Requirements for Unicast UDP) is the “Best Common Practices” document regarding developing NAT devices and how they should behave.


Mon, Jan 16, 2012

I’ve been a Wireshark devotee for probably a decade. I’m sure I’ll continue to be a huge fan for everyday use. I had heard stories about Microsoft’s Network Monitor being awesome a few years ago at GDC, but hadn’t actually tried it out until now. I have to say, for developing custom protocol parsers (for debugging the mutliplayer game you’re working on, for example), it wins hands down. I might never write another Wireshark dissector again.

Bandwidth Data

Mon, Sep 12, 2011 Here’s a link to the test data I mentioned in my previous post. It took me a little longer than expected to set up the Qwest/CenturyLink side of things. (Through no fault of theirs, though.. I just was lazy and didn’t want to move the bookshelf to get to the phone jack.) Data is just starting to come in now, but so far neither side looks that great. Only time will tell.

Bandwidth Woes

Wed, Sep 7, 2011

Today at 17:00, I will be the proud owner of not one, but **two **internet connections. I’ve been a Broadstripe customer for the last few years, and the service has been absolutely terrible. Sadly, because cable companies refuse to compete with each other, Broadstripe was my only option for DOCSIS broadband. When we moved in to our house, we had Qwest DSL (now CenturyLink), but it was also terrible: at the time, we were paying for 7mbps, their highest speed, and getting maybe 3mbps on a good day despite several service calls.

The point where everyone notices IPv6

Thu, Feb 3, 2011

On Monday, IANA fulfilled its last request for /8 blocks of IPv4 addresses. This triggers the IANA “[Global Policy for the Allocation of the Remaining IPv4 Address Space]( ipv4-space.htm)” exhaustion phase. This doesn’t mean there are no more available IPv4 addresses - APNIC just got two /8s on top of whatever they already have, and expect to be rationing them out for at least another 5 years. ARIN reported that they have almost five /8s worth of IPv4 addresses left to allocate.