June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Chapter 10: Security and Monitoring
dmesg’s output is flat text that you can redirect to a file. Suppose you wanted to iso-
late the traffic prefixed with Chicago into a file by itself:
# dmesg | grep Chicago >chicagoVoIP.txt
Or better yet, email that log to somebody, perhaps so they can import it into a
spreadsheet for further analysis. In the following example, pressing Ctrl-C will stop
the dmesg application and an email will be sent containing the Chicago entries:
# dmesg | grep Chicago | mail chicagoVoIPadmin@oreilly.com
SNMP
Simple Network Management Protocol is a lightweight method of collecting traffic
and performance data from network devices such as servers and switches. Different
kinds of data use different parameter schemas, called management information
bases, or MIBs. MIBs define how SNMP refers to metafields specific to a certain kind
of data, such as Ethernet traffic or DNS-lookup statistics.
MIBs exist for SIP (http://www.iana.org), VOCAL (http://www.vovida.org), MEGACO
(http://www.ietf.org), and other VoIP technologies. There are some useful VoIP-related
SNMP monitoring tools (OpenNMS, Multirouter Traffic Grapher, etc.) that can be
customized to make use of these MIBs, too. There isn’t yet a fully integrated SNMP
MIB for Asterisk, though, which leaves Asterisk administrators ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.