SNMP and SNMPv2c 1

[Netomaniac]

hi guys,

Is there any major difference between SNMP and SNMPv2. If there is a difference what extra info SNMPv2 incorporates when sending alarms.


thanks...........

 

[globalchicken]

SNMP V1 and V2 are very close. They both use community strings to
authenticate the packets. The community string is sent in plain-text in
every single SNMPv1 or SNMPv2 packet and the agent uses it to decide to
process the packet or discard it.
The main difference between V1 and V2 is that SNMPv2 added a few more packet
types like the GETBULK PDU which enable you to request a large number of GET
or GETNEXT in one packet. SNMPv1 was also originately defined to use SMI,
SNMPv2 uses SMIv2 which is a better, with more data types like 64-bit
counters, etc... But mostly the difference between V1 and V2 is internal and
the end user will probably not notice any difference between the two.

SNMPv3 was designed to address the weak V1/V2 security. SNMPv3 is based on
SNMPv2 (same packet types, it also uses SMIv2, etc...), but the main
difference is that it is a lot more secure.
It does not use community strings but users with passwords, and SNMPv3
packets can be authenticated and encrypted depending of how your users have
been defined.
In addition, the SNMPv3 framework defines user groups and mib-views which
enable an agent to control the access to its mib objects. A mib-view is a
subset of the mib. You can use mibviews to define what part of the mib a
user can read (SNMP GET/GETNEXT) or write (SNMP SET), etc...
The SNMPv3 framework can also be used with V1 and V2 but it was defined for
SNMPv3.

 

[Netomaniac]

Hi,

How is the community string used to authenticate the packet. Does the SNMP network manager will look for the community string in the SNMPv2c/v1 packet header and allow only those for which the SNMP network manager is programmed for.

Thanks,,,,,,,,,