Doubt's log

February 2003
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 Wednesday, February 19, 2003
About NATs
Terendo seems pretty cool (traffic IPv6 over IPv4 and bypass NAT issues). However, how much does Teredo (sometimes called Shipworm) rely on UPnP support? The slides Doubt linked to claims that it works for "all NAT", but it also discusses UPnP in depth. I've turned off UPnP support on all my machines inside my Linksys NAT, not because of the security issue but because my NAT doesn't behave when it's turned on. I have to routinely reset the NAT when UPnP support is turned on. I've updated to the latest firmware, but I'm still having the problem. [Harry Pierson's DevHawk Weblog]

It doesn't work for all NATs, but most and this mechanism does not use UPnP.

Not all NATs are created equal. The differences between them depend on thier behavior when an outgoing connection occurs, the most strict form of NAT (symetrical) requires that whatever port+IP you connected to is the only allow to send packets back in. This is one of the more "secure" forms of NATs (although NATs don't really exist to provide security). A lesser form might say that any port from the destination ip address is allowed to send packets back. Another type is the a NAT (Full Cone) that once a connection is established out anyone anywhere can send a packet back in. Different applications tend to fail or have some serious performance degragation (because it has to go through a less scalable central server) with a symetric NAT. Simular to symetric NATs (but will actually work when bootstrapping with an outside server) is the restricted NAT. I've wrote a little about the difference here.
10:11:11 AM    comments ==

200GB External 7200rpm drives Firewire and USB 2.0. Just released by Western Digital.  Makes me feel small with my puny 5400rpm 120GB external drive I only bought a few months ago :-(. [Sean 'Early' Campbell & Scott 'Adopter' Swigart's Radio Weblog]
My external is only 40 Gigs, and it's not even three months old yet. I just hope that the longhorn deisgners pay cloe attention to this trend.. Huge portable harddrives are going to be everywhere.
12:59:41 AM    comments ==

Good Read: Why Nerds are Unpopular [recursive]
12:40:26 AM    comments ==

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