Hi to all
With your helpful answers, following statements are clear:
- I'd like to use only sending of notification towards known client, i.e. no
any response from it
- snmptrap doesn't ever communicate with the agent. It sends traps directly
- the agent doesn't support source address spoofing either
- In both case a) and case b) the source address of the package is set to
10.140.20.71.
And new aspects/suggestions are proposed:
a) It would probably be easier to use iptables/netfilter to rewrite addresses...
b) You could use the agentxtrap command to......but there would still be no
support for source address spoofing
Note: with this suggestion the problem is still the same
That means, for the moment, only case a) is visible as an solution
Note: with case b) the problem is still the same
Please, could you give me more details in this particular (case a)) solution ?
BR / Zeljko
On 29. February 2012 17:27 Robert Story <[email protected]> wrote:
RS> First of all, snmptrap doesn't ever communicate with the agent. It sends
traps directly.
RS> Secondly, the agent doesn't support source address spoofing either.
RS> To do what you want, net-snmp would have to be modified to allow address
spoofing. It would probably be easier to use iptables/netfilter to rewrite
addresses...
On 29. February 2012 18:08 Dave Shield [[email protected]] wrote:
DS> I tried this... unfortunately you can only specify an address for which you
have an interface configured...
DS> If he wants to simulate 100 devices, he'd have to configure 100 aliases on
an interface.
DS> Errr - yes. If you're sending a message from a particular address,
DS> then an interface with that address needs to exist and be valid.
DS> Otherwise, how can you expect to receive any responses sent back to that
address, for example?
On 01. March 2012 18:08 Magnus Fromreide [[email protected]] wrote:
MF> As a matter of fact this is wrong. In both case a) and case b) the source
address of the package is set to 10.140.20.71. The agent parameter to v1-traps
does not affect the MF> source address, it only affects the agent-addr data
field of the package. Proxies that translate to v2-notifications should convert
that to a data item
MF> with OID snmpTrapAddress.0.
MF> You could use the agentxtrap command to, as your picture shows, tell the
agent to issue a trap or notification in accordance with it's configuration but
there would still be MF> no support for source address spoofing.
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