NAME¶
Smokeping::probes::TCPPing - TCPPing Probe for SmokePing
SYNOPSIS¶
*** Probes ***
+TCPPing
binary = /usr/bin/tcpping # mandatory
forks = 5
offset = 50%
step = 300
tcptraceroute = -e "sudo /bin/tcptraceroute"
timeout = 15
# The following variables can be overridden in each target section
pings = 5
port = 80
# [...]
*** Targets ***
probe = TCPPing # if this should be the default probe
# [...]
+ mytarget
# probe = TCPPing # if the default probe is something else
host = my.host
pings = 5
port = 80
DESCRIPTION¶
Integrates TCPPing as a probe into smokeping. The variable
binary must
point to your copy of the TCPPing program. If it is not installed on your
system yet, you can get it from
http://www.vdberg.org/~richard/tcpping. You
can also get it from
http://www.darkskies.za.net/~norman/scripts/tcpping.
The (optional) port option lets you configure the port for the pings sent. The
TCPPing manpage has the following to say on this topic:
The problem is that with the widespread use of firewalls on the modern Internet,
many of the packets that
traceroute(8) sends out end up being filtered,
making it impossible to completely trace the path to the destination. However,
in many cases, these firewalls will permit inbound TCP packets to specific
ports that hosts sitting behind the firewall are listening for connections on.
By sending out TCP SYN packets instead of UDP or ICMP ECHO packets,
tcptraceroute is able to bypass the most common firewall filters.
It is worth noting that tcptraceroute never completely establishes a TCP
connection with the destination host. If the host is not listening for
incoming connections, it will respond with an RST indicating that the port is
closed. If the host instead responds with a SYN|ACK, the port is known to be
open, and an RST is sent by the kernel tcptraceroute is running on to tear
down the connection without completing three-way handshake. This is the same
half-open scanning technique that
nmap(1) uses when passed the -sS
flag.
VARIABLES¶
Supported probe-specific variables:
- binary
- The location of your tcpping script.
Example value: /usr/bin/tcpping
This setting is mandatory.
- forks
- Run this many concurrent processes at maximum
Example value: 5
Default value: 5
- offset
- If you run many probes concurrently you may want to prevent
them from hitting your network all at the same time. Using the
probe-specific offset parameter you can change the point in time when each
probe will be run. Offset is specified in % of total interval, or
alternatively as 'random', and the offset from the 'General' section is
used if nothing is specified here. Note that this does NOT influence the
rrds itself, it is just a matter of when data acqusition is initiated.
(This variable is only applicable if the variable 'concurrentprobes' is
set in the 'General' section.)
Example value: 50%
- step
- Duration of the base interval that this probe should use,
if different from the one specified in the 'Database' section. Note that
the step in the RRD files is fixed when they are originally generated, and
if you change the step parameter afterwards, you'll have to delete the old
RRD files or somehow convert them. (This variable is only applicable if
the variable 'concurrentprobes' is set in the 'General' section.)
Example value: 300
- tcptraceroute
- tcptraceroute Options to pass to tcpping.
Example value: -e "sudo /bin/tcptraceroute"
- timeout
- How long a single 'ping' takes at maximum
Example value: 15
Default value: 5
Supported target-specific variables:
- pings
- How many pings should be sent to each target, if different
from the global value specified in the Database section. Note that the
number of pings in the RRD files is fixed when they are originally
generated, and if you change this parameter afterwards, you'll have to
delete the old RRD files or somehow convert them.
Example value: 5
- port
- The TCP port the probe should measure.
Example value: 80
AUTHORS¶
Norman Rasmussen <norman@rasmussen.co.za> Patched for Smokeping 2.x
compatibility by Anton Chernev <maznio@doom.bg>
