SNMP & Get-Request (unicast vs multicast)

Hi all,

i have installed an SNMP agent on a Windows 2003 Server Standard.

Under XP, this agent answers perfectly to SNMP get-request, with both
unicast or multicast destination address.

Under Windows Server 2003, this same agent answer to SNMP get-request only
when the destination address is the ip address of the server (unicast).

Why this difference of behaviour of the SNMP agent between unicast &
multicast address under Windows Server 2003.

Is there any security settings against broadcast/SNMP or something like that?

Here it is the broadcast mask used:

* 255.255.255.255 or
* 10.1.1.255

Unicast address :

* 10.1.1.221 (works fine)

In conclusion i could not discover 2003 server agent with SNMP get-request
with a multicast destination address. The only way to communicate with those
server is to use unicast address...

If i use wireshark on the windows 2003 server i can see both unicast and
multicast SNMP request (get-request). In case of unicast i can see the SNMP
response but not with multicast address.

How to go further in investigation on 2003 ? The server seems to not
propagate the request to my custom agent when the destination address is
multicast....

Best regards,

Any ideas why windows server 2003 does not propaget get-request with
multicast destination address to my extension agent throw the
SnmpExtensionQuery interface. Were as the request is propagted with unicast
address.

IpSec & Firewall Disabled !

The Intel extension agent of my lan driver have the same behaviour ...

It seems to be an OS UDP filtering feature or what else ?!

Help

"agent" wrote:

> Hi all,
>
> i have installed an SNMP agent on a Windows 2003 Server Standard.
>
> Under XP, this agent answers perfectly to SNMP get-request, with both
> unicast or multicast destination address.
>
> Under Windows Server 2003, this same agent answer to SNMP get-request only
> when the destination address is the ip address of the server (unicast).
>
> Why this difference of behaviour of the SNMP agent between unicast &
> multicast address under Windows Server 2003.
>
> Is there any security settings against broadcast/SNMP or something like that?
>
> Here it is the broadcast mask used:
>
> * 255.255.255.255 or
> * 10.1.1.255
>
> Unicast address :
>
> * 10.1.1.221 (works fine)
>
> In conclusion i could not discover 2003 server agent with SNMP get-request
> with a multicast destination address. The only way to communicate with those
> server is to use unicast address...
>
> If i use wireshark on the windows 2003 server i can see both unicast and
> multicast SNMP request (get-request). In case of unicast i can see the SNMP
> response but not with multicast address.
>
> How to go further in investigation on 2003 ? The server seems to not
> propagate the request to my custom agent when the destination address is
> multicast....
>
> Best regards,
>

Hi,

is this the right MS group for this kind of question ?

br

"agent" wrote:

> Any ideas why windows server 2003 does not propaget get-request with
> multicast destination address to my extension agent throw the
> SnmpExtensionQuery interface. Were as the request is propagted with unicast
> address.
>
> IpSec & Firewall Disabled !
>
> The Intel extension agent of my lan driver have the same behaviour ...
>
> It seems to be an OS UDP filtering feature or what else ?!
>
> Help
>
> "agent" wrote:
>
> > Hi all,
> >
> > i have installed an SNMP agent on a Windows 2003 Server Standard.
> >
> > Under XP, this agent answers perfectly to SNMP get-request, with both
> > unicast or multicast destination address.
> >
> > Under Windows Server 2003, this same agent answer to SNMP get-request only
> > when the destination address is the ip address of the server (unicast).
> >
> > Why this difference of behaviour of the SNMP agent between unicast &
> > multicast address under Windows Server 2003.
> >
> > Is there any security settings against broadcast/SNMP or something like that?
> >
> > Here it is the broadcast mask used:
> >
> > * 255.255.255.255 or
> > * 10.1.1.255
> >
> > Unicast address :
> >
> > * 10.1.1.221 (works fine)
> >
> > In conclusion i could not discover 2003 server agent with SNMP get-request
> > with a multicast destination address. The only way to communicate with those
> > server is to use unicast address...
> >
> > If i use wireshark on the windows 2003 server i can see both unicast and
> > multicast SNMP request (get-request). In case of unicast i can see the SNMP
> > response but not with multicast address.
> >
> > How to go further in investigation on 2003 ? The server seems to not
> > propagate the request to my custom agent when the destination address is
> > multicast....
> >
> > Best regards,
> >

You should probably try the "platformsdk.networking" group,
Good luck,
Anthony
http://www.airdesk.co.uk


"agent" <(E-Mail Removed)> wrote in message
news:2EBA6D1C-7BEB-444C-820B-(E-Mail Removed)...
> Hi,
>
> is this the right MS group for this kind of question ?
>
> br
>
> "agent" wrote:
>
>> Any ideas why windows server 2003 does not propaget get-request with
>> multicast destination address to my extension agent throw the
>> SnmpExtensionQuery interface. Were as the request is propagted with
>> unicast
>> address.
>>
>> IpSec & Firewall Disabled !
>>
>> The Intel extension agent of my lan driver have the same behaviour ...
>>
>> It seems to be an OS UDP filtering feature or what else ?!
>>
>> Help
>>
>> "agent" wrote:
>>
>> > Hi all,
>> >
>> > i have installed an SNMP agent on a Windows 2003 Server Standard.
>> >
>> > Under XP, this agent answers perfectly to SNMP get-request, with both
>> > unicast or multicast destination address.
>> >
>> > Under Windows Server 2003, this same agent answer to SNMP get-request
>> > only
>> > when the destination address is the ip address of the server (unicast).
>> >
>> > Why this difference of behaviour of the SNMP agent between unicast &
>> > multicast address under Windows Server 2003.
>> >
>> > Is there any security settings against broadcast/SNMP or something like
>> > that?
>> >
>> > Here it is the broadcast mask used:
>> >
>> > * 255.255.255.255 or
>> > * 10.1.1.255
>> >
>> > Unicast address :
>> >
>> > * 10.1.1.221 (works fine)
>> >
>> > In conclusion i could not discover 2003 server agent with SNMP
>> > get-request
>> > with a multicast destination address. The only way to communicate with
>> > those
>> > server is to use unicast address...
>> >
>> > If i use wireshark on the windows 2003 server i can see both unicast
>> > and
>> > multicast SNMP request (get-request). In case of unicast i can see the
>> > SNMP
>> > response but not with multicast address.
>> >
>> > How to go further in investigation on 2003 ? The server seems to not
>> > propagate the request to my custom agent when the destination address
>> > is
>> > multicast....
>> >
>> > Best regards,
>> >