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Internet port numbers Network
Although this isn't an OS X specific tip, if you do much with the built-in UNIX-based services in OS X (such as SSH, Apache, and FTP), it may be relevant. These services operate over ports, which are defined and managed by IANA (Internet Assigned Numbers Authority). If you'd like to familiarize yourself with who they are and what they do, just visit their web site.

If you'd like to see a very exhaustive list of port assignments, IANA is the place to go. This list is the most exhaustive that I've ever seen. This can be useful for things such as establishing 'port forwarding' in a router, which will allow certain ports (such as 548, for Appletalk over TCP) to be sent through your router to one target machine (your Mac running OS 9 file sharing over TCP/IP).

If you are a "power user" in the Mac OS 9 world, and you want to delve into all the services that are offered with OS X, some knowledge of port numbers may be helpful as you start experimenting with Apache, SSH, FTP, Samba, etc. For the typical OS 9 convert, though, you won't have to know anything about them -- other than they're out there, and they help make some of the cool stuff in the new OS possible.
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really ?
Authored by: robh on Jan 25, '01 04:10:14PM
"Some knowledge of Internet port numbers may help ease your transition to OS X in a couple of months."

Why do you think such knowledge is needed ?. I can't see the need myself.

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really ?
Authored by: robg on Jan 25, '01 05:41:00PM

A couple of reasons why you might want to know something about ports...

First, with built-in Apache, FTP, SSH, and telnet, some knowledge of ports may be more
useful with OS X than it was with OS 9. For example, if you have an ISP (as I do) that blocks
ports below 1000, but still want to use SSH and Apache, you need to remap the ports. It
would be useful to have some knowledge of what they are and how they work in order to
successfully remap them. Alternatively, if your Apache isn't working, it might be good to know
that it's on port 80, and you could then find out that your ISP is blocking low-numbered ports.

Second, with UNIX as the core, I tend to think the issue of 'open ports' may come up more
often when discussing possible attacks against always-connected home machines.

Third, I'm in the "more knowledge is a good thing" camp (part of the reason I built this site in
the first place) so I figure the more you know about the system, the better off you are. Hence,
it can't hurt to at least understand ports.

Is it a life-or-death requirement for success in OS X? Hardly. But then again, I didn't say that.
I just said it may help ease the transition...


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really ?
Authored by: robh on Jan 26, '01 04:19:58AM

fairy nuff.

I'm just a little worried that talk of the necessity of such stuff could easily scare off potential converts to OSX. That's not to say one shouldn't discuss such issues.

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Changed it a bit...
Authored by: robg on Jan 26, '01 09:09:00AM

Good observation.

I modified the last line and clearly distinguished between the power users who want to learn
everything, and the typical day-to-day OS 9 users (like my mom!) who won't care one bit
about this stuff.

Thanks for the feedback!


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Using Port Numbers to Config SAMBA
Authored by: Anonymous on Feb 27, '01 05:54:12AM

I have been really impressed with the power behind the scenes of OS X. Thanks for the heads up on port assignments. I was able to configure SAMBA using help
from this page and others. It is going to be a whole new world with OS X capable of giving power users a higher ceiling to work with. The range of OS X is amazing. You can get by just fine by not thinking about port numbers or use them to their fullest advantage. I'm very excited to see what the future holds for OS X.

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SMTP on HiPort
Authored by: Deeeep on Jul 18, '01 06:23:15AM


Is it possible to run another SMTP server on a hi port (port 2500). The local cable provider blocks all known ports and I would like to add a hi port to my server to cater to their problem. Idea would be to receive on port 2500 and then send on to another machine on port 25...


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