Erik Anderson: > OK, brief networking stack lesson here. > > IP, the basis for all of these technologies, is a Layer 3 protocol. > TCP and UDP are both built on IP. They are Layer 4. > HTTP, SSH, SMTP, DNS, etc. are all built on TCP or UDP. They > are Layer 7 (application) protocols. > > So, when dealing with say HTTP, you're not *only* using HTTP, but >you're also using each level of the stack below that the protocol > was built on. In the case of HTTP, the stack goes something like > HTTP/TCP/IP. For DNS, it's DNS/UDP/IP. > I'm aware of that. I guess this is a difference in terminology. I think of UDT as replacing UDP in the application even though UDT uses UDP. Iirc, we previously discussed ssh tunnels and IPsec in this newsgroup. As long as I keep using ssh tunnels, I'm locked into using TCP. So using UDT rather than TCP between my back and middle tiers isn't an option unless I stop using ssh tunnels. I'm still thinking about using IPsec. > Excellent choice. I've been a die-hard apache fan for most of > my sysadmin years, but have switched nearly every system > I can over to nginx in the last six months, and couldn't be happier. That's good to hear. I started using nginx yesterday evening. -- Brian Wood Ebenezer Enterprises - so far G-d has helped us. http://webEbenezer.net (651) 251-9384 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.mn-linux.org/pipermail/tclug-list/attachments/20130303/4ab3f6c8/attachment.html>