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<H1>[Mageia-discuss] Setting up a port forward</H1>
<B>Deri James</B>
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TITLE="[Mageia-discuss] Setting up a port forward">deri at chuzzlewit.myzen.co.uk
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<I>Sat Sep 1 00:16:27 CEST 2012</I>
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<PRE>On Friday 31 Aug 2012 22:42:26 Thomas Backlund wrote:
><i> Why not simply have sshd listen on 2 ports and skip need for port
</I>><i> forwarding?
</I>><i>
</I>><i>
</I>><i> Just uncomment the "Port 22" line in /etc/ssh/sshd_config
</I>><i> and add a second line with the second port
</I>><i>
</I>><i> so it would look like
</I>><i>
</I>><i> Port 22
</I>><i> Port 5122
</I>><i>
</I>><i> and restart sshd
</I>><i>
</I>><i> with this all access that expects port 22 will continue to work,
</I>><i> and you can also access it through the new 5122 port.
</I>><i>
</I>><i> Simple and effective, and no portforwarding needed.
</I>><i>
</I>><i> --
</I>><i> Thomas
</I>
And add 5122/tcp to the "Advanced" tab in MCC -> Security -> Personal Firewall
(if you are using a personal firewall).
If the server is accessible from the internet I would recommend some further
changes to sshd_conf. This is what I use (assuming this is a server for
personal use, not with hundreds of users connecting):-
=================================================
LoginGraceTime 120
PermitRootLogin no
TCPKeepAlive yes
AllowUsers ->your user name here<-
MaxStartups 2:90:4
==================================================
The "MaxStartups" parameter deters the script kiddies trying to guess the
password:-
MaxStartups
========
Specifies the maximum number of concurrent unauthenticated connections to the
SSH daemon. Additional connections will be dropped until authentication
succeeds or the LoginGraceTime expires for a connection. The default is 10.
Alternatively, random early drop can be enabled by specifying the three colon
separated values “start:rate:full” (e.g. "10:30:60"). sshd(8) will refuse
connection attempts with a probability of “rate/100” (30%) if there are
currently “start” (10) unauthenticated connections. The probability increases
linearly and all connection attempts are refused if the number of
unauthenticated connections reaches “full” (60).
Cheers
Deri
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