Re: can't run sshd on 23456 in Fedora 19

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This thread has slipped into a security debate, but I certainly didn't 
mean to start a flame war. 

For the curious, I'm not doing this to enhance security, and yes, port 
23456 was just for illustrative purposes only. That said, I don't think 
it is too harmful either. 

There was a rather detailed reply explaining the difference between 
privileged and non-privileged ports (thanks, I know that from graduate 
school), but if someone has gained access to my box do they really need 
to impersonate my sshd running on 23456? They probably own me anyway. 
Now, a legitimate non-privileged user might crash sshd on 23456 and run 
his own stuff, but hey, I'm the only user.

Then consider also the odds of sshd having a buffer overflow, running on 
the default port 22, vs. someone running a comprehensive scan on you. The 
sshd port is the only thing I have open in my firewall, so to all quick 
scans (port 21, 22, 23, 80, etc.) I'm non-existent. But, as Reindl Harald 
said, that's already another level of sophistication and with proper rate 
control in place and other measures in place, those can be dealt with.

The default ports are for the world to be able to access the services 
you're offering (http, ftp, whatever). But when I'm the only one that 
needs remote access to my machine, I think I'm ok to run sshd on a 
different port. 


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