[email protected] wrote: > Well, I use the ftp site to share files with my students (pdfs, mp4s, > assorted apps, etc). So, I think I need a dedicated ftp server after > all.... > > *HTH, > A. Jorge Garcia > http://calcpage.tripod.com <http://calcpage.tripod.com/> > > Teacher & Professor > Applied Mathematics, Physics & Computer Science > Baldwin Senior High School & Nassau Community College* I'll make a few comments on various points made by others on this thread.
As someone else pointed out, you can have multiple servers running on the same machine. Each service has a standard port (port 21 for ftp, port 22 for ssh, port 23 for telnet, port 80 for HTTP, port 443 for HTTPS. Sage uses port 8000 by default). There are 2^16 -1 ports, so in principle you could have 2^16 -1 different types of servers running, or 2^16 -1 servers of the same type running on different ports. Except in cases where the highest levels of security are needed, or the amount of traffic is very high, it would be a huge waste of resources to dedicate one physical computer to each of these. Just run all services on the one bit of hardware. There is no anonymous ftp equivalent for SSH. The whole idea of secure shell (SSH) is to provide a very high level of security. The whole idea of anonymous ftp is you let anyone get the data. The two are as different as chalk and cheese. The fact the standard Sage server uses HTTP, does not prevent you running a normal web server on the same machine too, as long as they use different ports (80 and 8000 are different of course). In fact, Apache allows you to run multiple web sites, all on the one server, using the same port, using something called a 'VirtualHost'. Things get more complex when security is more of an issue. Allowing root access via via telnet or ftp is a particularly bad idea. Instead of anonymous ftp, if students need to get at files, I'd just stick them in a directory where Apache servers files from. That's more convenient than ftp for most people, as they can use a browser. You can browse my files here http://sage.math.washington.edu/home/kirkby/Solaris-fixes/ despite the fact other parts of http://sage.math.washington.edu/ are more typical of what you see on a web server. If you want students to upload data, I would give them accounts on a machine with an ssh server and tell them to use ssh. Whilst uploading can be done via a web site, it is in my opinion not as secure and is a lot more hassle to implement. In any case, getting students to use ssh is no bad thing. It will introduce them to something which they might not have used before and is actually very useful. Dave -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
