Re: Re: snmptrap v3 how to specify source IP

By routing decision, as I noted before.

RegK

On Fri, May 24, 2019 at 3:23 PM ww <[email protected]> wrote:

> Hi.
> Thanks for your reply. I try to use "-s" and "--clientaddr" but it dose
> not work.
> My version is net-snmp-5.8.
> My commond is "snmptrap -v3 -u usertest -l authPriv -a SHA -A usertest  -x
> AES -X usertest  -s 10.2.24.121  10.2.24.18 84100 …… ".
> May I ask you how the snmptrap chooses the network interface by it self?
> Is it polling all the enable ports?
>
> Regards
>
> At 2019-05-23 15:54:28, "Klemen Sladic" <[email protected]> wrote:
>
> Hi.
>
> Any traffic originating from snmpd will have src IP of outgoing network
> interface.
> From my experience "clientaddr" helps for replies generated by snmpd. For
> example,
> if you have multiple interfaces and "clientaddr" is set, any snmpd
> response, like response to
> snmpget, snmpwalk etc. will have desired src IP.
>
> But this won't work for packets initiated by snmpd, like traps.
> What I did, was changing the route src settings.
> For example, if you have eth0 in 192.168.0.0/24 and eth1 in 192.168.1.0/24
> and you want any traffic to
> have source of 192.168.0.0/24, then change eth1 subnet route like:
>
> ip route change 192.168.1.0/24 dev eth1 src 192.168.0.1
>
> if 192.168.0.1 is eth0 IP.
>
> Of course this may have other side effects on routing in your system.
>
> RegK
>
> On Thu, May 23, 2019 at 6:30 PM Anders Wallin <[email protected]> wrote:
>
>> You can use "clientaddr" in snmp.conf or snmpd.conf,
>> https://linux.die.net/man/5/snmp.conf
>>
>> In 5.8 you also have the possibility to use "-s" with trapsess, but I did
>> not found any documentation on it.
>> but check the test
>> code, testing/fulltests/default/T184trapsesssource_simple
>>
>> Regards
>> Anders Wallin
>>
>>
>> On Wed, May 22, 2019 at 5:21 PM ww <[email protected]> wrote:
>>
>>> Hello, Thank you for reading my email. Can I specify the source IP when
>>> send a V2/V3 trap like V1?
>>>
>>>
>>>
>>>
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>
>
>
>

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