Re: [pysnmp-users] PySNMP v3 Notification receiver

[Ilya E. <il...@gl...>]

You should definitely bind your script to 0.0.0.0 or any other non-loopback interface.

If you still see no packets coming into the script, try enabling debugging in pysnmp to see if packets ever reach it and the reason why it does not respond.

  from pysnmp import debug

  debug.setLogger(debug.Debug(‘all’))


> On 29 Aug 2016, at 16:41, rajesh chandra <cxr...@gm...> wrote:
> 
> Hi Paul,
> 
> I have tried all the possible scenarios which includes 0.0.0.0 address but i still see same behavior. 
> 
> Interesting(and also frustrating) thing is , I can see SNMP trap(see below) on My VM's eth0 but nothing on Listener script :( . 
> 
> mulamall@tpcvm40:~$ sudo tcpdump -i eth0 
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
> 15:15:24.047840 IP device.55718 > .snmp-trap:  F=ap U=usr-md5-des [!scoped PDU]36_6b_6b_5f_b8_25_36_14_e5_f6_cd_3d_a1_75_bb_e2_c3_3e_f5_68_da_28_c1_41_d5_1f_f1_85_1d_9f_60_c1_89_e5_ad_61_35_94_c9_34_01_70_09_df_39_ac_30_e9_c0_1d_3b_b7_15_67_33_63_3f_fe_1e_56_c1_7d_1d_f3_eb_2d_ca_76_af_03_c7_45_9e_70_9b_eb_b4_5c_b9_f4_c8_d7_17_d2_03_f5_75_6b_b4_79_73_a2_1b_9c_a0_40_13_68_82_e7_1c_14_df_f1_ce_9d_00_a7_dc_1a_d5_fe_0d_e6_2a_0e_81_5a_cd_04_38_cb_1b_6e_53_d5_a4_a3_e9_ee_18_f8_1c_46_95_d8_bc_51_ba_7f_f3_b0_e0_1b_b9_4e_17_03_6d_95_24_3d_ab_be_bc_ea_e1_39_16_d3_cd_54_7e_6b_62_19_8f_8a
> 
> 
> On Mon, Aug 29, 2016 at 10:30 AM, <Pau...@de...> wrote:
> 
> > On Aug 29, 2016, at 9:55 AM, rajesh chandra <cxr...@gm...> wrote:
> >
> > Hi,
> >
> > I have PySNMP notification receiver for SNMP V3 traps as below...
> >
> > Instead of localhost IP , I have My VM ip -----> for this scenario, I am not receiving any traps if generate one from outside the VM(I am using snmptrap command from another machine) but I can see SNMP data when I do tcpdump on VM eth0. If I generate trap on same machine(My VM) I can see trap data via PySNMP trap receiver script. I have no issues with network connectivity and FW is not blocking any of My data.
> > ...
> >
> > # UDP over IPv4
> > config.addSocketTransport(
> >     snmpEngine,
> >     udp.domainName,
> >     udp.UdpTransport().openServerMode(('127.0.0.1', 162))
> 
> That address/port pair is used as the argument on a socket bind() call.  The address, if specified, means you only want packets from that address.  If you want packets from any address, specify 0.0.0.0.
> 
>         paul
> 
> 
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