Hi,

For my testing, I needed to send source IP spoofed traps to SNMP
manager (NMS). I am able to send traps now with some dirty way.
I have used Net::SNMP module to send traps. Modified the IPTABLES rule to change the source ip of trap packets.

#!/usr/bin/perl
use lib '/opt/perl_64/lib/site_perl/5.8.8/';
use strict;
use warnings;
use Net::SNMP qw(:ALL);
my $curr_time = (scalar time);
print "IPTABLES Rule inserted\n";
`iptables -t nat -A POSTROUTING -d 10.10.70.14 -p udp --dport 5286 -j SNAT --to 10.10.16.230`;
my ($session, $error) = Net::SNMP->session(
-hostname => '10.10.70.14',
-port => '5286',
-localaddr => '192.168.10.121',
-localport => '1028',
-version => 'snmpv2c',
-community => 'PUBLIC',
);
if (!defined($session)) {
printf("ERROR: %s.\n", $error);
exit 1;
}

my $result = $session->snmpv2_trap(
-varbindlist => [
'1.3.6.1.2.1.1.3.0', , TIMETICKS, 600,
'1.3.6.1.6.3.1.1.4.1.0',OBJECT_IDENTIFIER,'1.3.6.1.4.1.42767.64.1.1.5.1.40.1',
'1.3.6.1.4.1.42767.64.1.1.3.1.9', INTEGER32, 11,
'1.3.6.1.4.1.42767.64.1.1.3.1.10', OBJECT_IDENTIFIER, 1.3.6.1.2.1.26.2.1.1.3.1.9,
'1.3.6.1.4.1.42767.64.1.1.3.1.11', COUNTER32, 10,
'1.3.6.1.4.1.42767.64.1.1.3.1.12', TIMETICKS, $curr_time,
'1.3.6.1.4.1.42767.64.1.1.3.1.13', INTEGER32, 2,
'1.3.6.1.4.1.42767.64.1.1.3.1.14', OCTET_STRING, '' ]
);

if (!defined($result)) {
printf("ERROR: %s.\n", $session->error());
}
else {
printf("SNMPv2-Trap-PDU sent.\n");
}

$session->close();
`iptables -t nat -D POSTROUTING -d 10.10.70.14 -p udp --dport 5286 -j SNAT --to 10.10.16.230`;
print "IPTABLES rules removed\n";

In reply to Re^2: How to encode snmpv2 trap varbind by ahm123
in thread How to encode snmpv2 trap varbind by ahm123

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