Hi   I got exactly the same problem and wrote a patch. You will need to 
recompile net-snmp from sources though.  Patches and instructions here -  
sourceforge.net sourceforge.net  They are for net-snmp-5.7.3, I didn't have 
a chance to test them on 5.8 yet.   Pik Master





        Dnia 10 kwietnia 2019 17:30 Kaleemulla Sharief \(kasharie\) via 
Net-snmp-users <net-snmp-users@lists.sourcefo napisał(a):



         If this is specific to only 10 servers, you could configure NAT on 
snmp proxy for these 10 servers to do address spoofing?

 Sent from my iPad

 On 10-Apr-2019, at 8:59 PM, 700 grm <700...@gmail.com> wrote:

 Hi,

 I need help, with preserving SNMP trap IP address and hostname when forwarding 
SNMP traps through snmptrapd

 I got 10 servers behind a firewall and router, I have setup SNMP trap 
forwarding and GET based on community string however, snmptrapd rewrites trap 
headers, IPs and host name with SNMP Proxy server information
 <image.png>
 snmptrapd.conf  only configuration that was added
 /etc/snmp/snmptrapd.conf
      authCommunity   net public
      forward  default  10.12.4.192 public
     

 I was expecting to get trap with SRV1 information:

 2019-04-10 08:52:46 SRV1.localhost  [UDP: [192.168.0.20:36670->[X.X.X.X]
 DISMAN-EVENT-MIB::sysUpTimeIns = Timeticks: (14866232) 1 day, 17:17:42.32  
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::sysName   SNMPv2-MIB::sysName.0 = 
STRING: test trap from xxx

 However, I am getting:

 2019-04-10 08:52:46 snmp-proxy.localhost  [UDP: 
[192.168.0.10:36670->[X.X.X.X]
 DISMAN-EVENT-MIB::sysUpTimeIns = Timeticks: (14866232) 1 day, 17:17:42.32  
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::sysName   SNMPv2-MIB::sysName.0 = 
STRING: test trap from xxx

 I will appreciate any help

 Thx and regards

 700grm
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