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Special Forums UNIX and Linux Applications Infrastructure Monitoring Accept SNMP Packets... Post 302471558 by jim mcnamara on Saturday 13th of November 2010 07:32:44 PM
Old 11-13-2010
SNMP has its own protocol, both for data inquiry and security.
In POSIX unix there are several files to control all of this. Net-SNMP, although I've never used it, has ways to implement all of this stuff.

By default SNMP uses UDP on port 161. You can create a 'community', with clearly defined access levels.

Instead of this forum, read the Orielly Book
Essential SNMP - O'Reilly Media

SNMP protocol is a product of DARPA (US dept of defense). This means it verges on idiotic as it was conceived by bureaucrats. And a meaningful undertstanding of what you are asking is way beyond the scope of a forum.

Example: the answer to each of your questions varies by version of SNMP - 1, 2, or 3.

Wait til you read about MIB files. There is a whole book just on the mib2c utility.
My Solaris conf files for snmp (and there can be more than one) are huge, and are maintained by special scripts.

There is no simple shortcut to all of this stuff. Sorry. Without the right background it is easy to mess things up. IMO.
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Info::Layer3::Cisco(3pm)				User Contributed Perl Documentation				  Info::Layer3::Cisco(3pm)

NAME
SNMP::Info::Layer3::Cisco - SNMP Interface to L3 and L2+L3 IOS Cisco Device that are not covered in other classes. AUTHOR
Max Baker SYNOPSIS
# Let SNMP::Info determine the correct subclass for you. my $cisco = new SNMP::Info( AutoSpecify => 1, Debug => 1, # These arguments are passed directly to SNMP::Session DestHost => 'myswitch', Community => 'public', Version => 2 ) or die "Can't connect to DestHost. "; my $class = $cisco->class(); print "SNMP::Info determined this device to fall under subclass : $class "; DESCRIPTION
Subclass for Generic Cisco Routers running IOS Inherited Classes SNMP::Info::CiscoVTP SNMP::Info::CDP SNMP::Info::CiscoStats SNMP::Info::CiscoImage SNMP::Info::CiscoRTT SNMP::Info::CiscoQOS SNMP::Info::CiscoConfig SNMP::Info::Power SNMP::Info::Layer3 Required MIBs CISCO-EIGRP-MIB Inherited Classes' MIBs See "Required MIBs" in SNMP::Info::CiscoVTP for its own MIB requirements. See "Required MIBs" in SNMP::Info::CDP for its own MIB requirements. See "Required MIBs" in SNMP::Info::CiscoStats for its own MIB requirements. See "Required MIBs" in SNMP::Info::CiscoImage for its own MIB requirements. See "Required MIBs" in SNMP::Info::CiscoRTT for its own MIB requirements. See "Required MIBs" in SNMP::Info::CiscoQOS for its own MIB requirements. See "Required MIBs" in SNMP::Info::CiscoConfig for its own MIB requirements. See "Required MIBs" in SNMP::Info::CiscoPower for its own MIB requirements. See "Required MIBs" in SNMP::Info::Layer3 for its own MIB requirements. GLOBALS
These are methods that return scalar value from SNMP $cisco->vendor() Returns 'cisco' $cisco->eigrp_id() ("cEigrpAsRouterId") Global Methods imported from SNMP::Info::CiscoVTP See documentation in "GLOBALS" in SNMP::Info::CiscoVTP for details. Globals imported from SNMP::Info::CDP See documentation in "GLOBALS" in SNMP::Info::CDP for details. Globals imported from SNMP::Info::CiscoStats See documentation in "GLOBALS" in SNMP::Info::CiscoStats for details. Globals imported from SNMP::Info::CiscoImage See documentation in "GLOBALS" in SNMP::Info::CiscoImage for details. Globals imported from SNMP::Info::CiscoRTT See documentation in "GLOBALS" in SNMP::Info::CiscoRTT for details. Globals imported from SNMP::Info::CiscoQOS See documentation in "GLOBALS" in SNMP::Info::CiscoQOS for details. Globals imported from SNMP::Info::CiscoConfig See documentation in "GLOBALS" in SNMP::Info::CiscoConfig for details. Globals imported from SNMP::Info::CiscoPower See documentation in "GLOBALS" in SNMP::Info::CiscoPower for details. Globals imported from SNMP::Info::Layer3 See documentation in "GLOBALS" in SNMP::Info::Layer3 for details. TABLE METHODS
These are methods that return tables of information in the form of a reference to a hash. $cisco->eigrp_peers() Returns EIGRP peer IP addresses ("cEigrpPeerAddr") $cisco->i_vlan() Returns a mapping between "ifIndex" and the PVID or default VLAN. Table Methods imported from SNMP::Info::CiscoVTP See documentation in "TABLE METHODS" in SNMP::Info::CiscoVTP for details. Table Methods imported from SNMP::Info::CDP See documentation in "TABLE METHODS" in SNMP::Info::CDP for details. Table Methods imported from SNMP::Info::CiscoStats See documentation in "TABLE METHODS" in SNMP::Info::CiscoStats for details. Table Methods imported from SNMP::Info::CiscoImage See documentation in "TABLE METHODS" in SNMP::Info::CiscoImage for details. Table Methods imported from SNMP::Info::CiscoRTT See documentation in "TABLE METHODS" in SNMP::Info::CiscoRTT for details. Table Methods imported from SNMP::Info::CiscoQOS See documentation in "TABLE METHODS" in SNMP::Info::CiscoQOS for details. Table Methods imported from SNMP::Info::CiscoConfig See documentation in "TABLE METHODS" in SNMP::Info::CiscoConfig for details. Table Methods imported from SNMP::Info::CiscoPower See documentation in "TABLE METHODS" in SNMP::Info::CiscoPower for details. Table Methods imported from SNMP::Info::Layer3 See documentation in "TABLE METHODS" in SNMP::Info::Layer3 for details. perl v5.12.4 2011-09-28 Info::Layer3::Cisco(3pm)
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