firewall vs. closing ports Post: 14971

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Special Forums Cybersecurity firewall vs. closing ports Post 14971 by Neo on Friday 8th of February 2002 11:08:18 AM

02-08-2002

Administrator

If you have one box (a webserver) behind a firewall and you are already managing the webserver well, then a firewall is still necessary to block individual IP addresses that may be attacking open ports.

However, if you can add filtering rules on the webserver using firewall-like filtering software AND you have plenty of CPU and memory to handle the processing load, then a firewall is not necessary.

Having an extra and unnecessary firewall in place that is not well configured or managed is more dangerous than having no firewall when the firewall is just protecting one server.

I tend to disagree with LivinFree and think that firewalls are good, but not necessary 'the best' solution. The best solution depends on your configuration, your time, how much time you want to spend managing servers, etc.

If you have 100 or 1000 servers to manage then a firewall is much more critical than if you have to manage a single web server. And, as stated, if the web server has plenty of horse power, has IP filtering software at the kernel level, and is well managed, a firewall is an extra expense that adds minimal value for a potential large management expense.

Don't be fooled by buzzwords and seduced by technology, good process and well thought out architectures bring more security than adding more gizmos.

Neo

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LEARN ABOUT DEBIAN

ibv_ud_pingpong

IBV_UD_PINGPONG(1)						   USER COMMANDS						IBV_UD_PINGPONG(1)

NAME

       ibv_ud_pingpong - simple InfiniBand UD transport test

SYNOPSIS

       ibv_ud_pingpong [-p port] [-d device] [-i ib port] [-s size] [-r rx depth] [-n iters] [-l sl] [-e] HOSTNAME

       ibv_ud_pingpong [-p port] [-d device] [-i ib port] [-s size] [-r rx depth] [-n iters] [-l sl] [-e]

DESCRIPTION

       Run a simple ping-pong test over InfiniBand via the unreliable datagram (UD) transport.

OPTIONS

       -p, --port=PORT
	      use TCP port PORT for initial synchronization (default 18515)

       -d, --ib-dev=DEVICE
	      use IB device DEVICE (default first device found)

       -i, --ib-port=PORT
	      use IB port PORT (default port 1)

       -s, --size=SIZE
	      ping-pong messages of size SIZE (default 2048)

       -r, --rx-depth=DEPTH
	      post DEPTH receives at a time (default 500)

       -n, --iters=ITERS
	      perform ITERS message exchanges (default 1000)

       -l, --sl=SL
	      send messages with service level SL (default 0)

       -e, --events
	      sleep while waiting for work completion events (default is to poll for completions)

SEE ALSO

       ibv_rc_pingpong(1), ibv_uc_pingpong(1), ibv_srq_pingpong(1)

AUTHORS

       Roland Dreier
	      <rolandd@cisco.com>

BUGS

       The  network  synchronization between client and server instances is weak, and does not prevent incompatible options from being used on the
       two instances.  The method used for retrieving work completions is not strictly correct, and race conditions may  cause	failures  on  some
       systems.

libibverbs							  August 30, 2005						IBV_UD_PINGPONG(1)