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Cybersecurity

firewall vs. closing ports

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Special Forums Cybersecurity firewall vs. closing ports
# 8  
Old 02-24-2002
Great suggestions by everyone. While we are on this topic ...

You did not mention if this was personal or work use. If you dont have a machine to spare, and don't plan on a firewall or are working on a long term firewall solution, the least that you should do, is to disable access to stuff like telnet, ftp, etc. Telnet, ftp is not secure since you are transmitting cleartext passwords over the internet.

In FreeBSD you can edit the /etc/hosts.allow file to turn off access to some or all of these services. For example, if you absolutely need telnet, then allow it from all the known domains and IPs.

Also check your /etc/services file to see if you can completely turn off some of them.

LivingFree points this appropriately, if you don't have ports open, you can't attack them!
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LEARN ABOUT DEBIAN

rds-ping

RDS-PING(1)						    BSD General Commands Manual 					       RDS-PING(1)

NAME

     rds-ping -- test reachability of remote node over RDS

SYNOPSIS

     rds-ping [-c count] [-i interval] [-I local_addr] remote_addr

DESCRIPTION

     rds-ping is used to test whether a remote node is reachable over RDS.  Its interface is designed to operate pretty much the standard ping(8)
     utility, even though the way it works is pretty different.

     rds-ping opens several RDS sockets and sends packets to port 0 on the indicated host. This is a special port number to which no socket is
     bound; instead, the kernel processes incoming packets and responds to them.

OPTIONS

     The following options are available for use on the command line:

     -c count
	     Causes rds-ping to exit after sending (and receiving) the specified number of packets.

     -I address
	     By default, rds-ping will pick the local source address for the RDS socket based on routing information for the destination address
	     (i.e. if packets to the given destination would be routed through interface ib0, then it will use the IP address of ib0 as source
	     address).	Using the -I option, you can override this choice.

     -i timeout
	     By default, rds-ping will wait for one second between sending packets. Use this option to specified a different interval. The timeout
	     value is given in seconds, and can be a floating point number. Optionally, append msec or usec to specify a timeout in milliseconds
	     or microseconds, respectively.
     Specifying a timeout considerably smaller than the packet round-trip time will produce unexpected results.

AUTHORS

     rds-ping was written by Olaf Kirch <olaf.kirch@oracle.com>.

SEE ALSO

     rds(7), rds-info(1), rds-stress(1).

BSD
								   Apr 22, 2008 							       BSD