use Net::SNMP;
use strict;
use warnings;
                                                                                
open IPFILE, "ipfile.txt" or die "Can't get IPs - $!\n";
                                                                                
my $community = 'public';
my $ifIndex   = '1.3.6.1.2.1.2.2.1.1';
my $ifDescr   = '1.3.6.1.2.1.2.2.1.2';
                                                                                
while ( my $ip = <IPFILE> )
{
    chomp $ip;
                                                                                
    my ( $session, $error ) = Net::SNMP->session(
        -hostname  => $ip,
        -community => $community,
        -port      => 161
    );
    my $response;
                                                                                
    if ( defined( $response = $session->get_table($ifIndex) ) )
    {
        foreach my $index ( values %{$response} )
        {
            my $this_desc = "$ifDescr.$index";
            my $description;
            if ( defined( $description = $session->get_request($this_desc) ) )
            {
                print values %{$description}, "\n";
            }
        }
                                                                                
    }
                                                                                
    $session->close();
}