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Full Discussion: firewall vs. closing ports
Special Forums Cybersecurity firewall vs. closing ports Post 14922 by adam_crosby on Friday 8th of February 2002 01:16:24 AM
Old 02-08-2002
firewall vs. closing ports

This may be kind of a stupid question, but here goes:
Say I'm running a FreeBSD webserver (w/apache). I've managed to close ALL open ports (including SSH/telnet and portmapper), excepting '80' that apache is listening on. A netstat -a shows me nothing open.
Discounting DoS/DDoS or holes in apache, is there really a reason to run a firewall on a box like this? If nothing is listening on any ports but 80, what function will a firewall perform (like ipf (pf now I guess))? Some super-sekrit port-opening prevention?
The TCP/IP stack isn't really vulnerable to say, the Ping of Death or something like, and there are no sessions to hijack (w/this particular website), so I'm at a loss as to what a firewall would do. Or am I just beating a dead horse, so to speak?
 

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IBV_RC_PINGPONG(1)						   USER COMMANDS						IBV_RC_PINGPONG(1)

NAME
ibv_rc_pingpong - simple InfiniBand RC transport test SYNOPSIS
ibv_rc_pingpong [-p port] [-d device] [-i ib port] [-s size] [-r rx depth] [-n iters] [-l sl] [-e] HOSTNAME ibv_rc_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 reliable connected (RC) 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 4096) -r, --rx-depth=DEPTH post DEPTH receives at a time (default 1000) -n, --iters=ITERS perform ITERS message exchanges (default 1000) -l, --sl=SL use SL as the service level value of the QP (default 0) -e, --events sleep while waiting for work completion events (default is to poll for completions) SEE ALSO
ibv_uc_pingpong(1), ibv_ud_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_RC_PINGPONG(1)
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