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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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)