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Netflow Daemon Listening UDP Port

Since version 3 of opFlow the default listening port is the more-or-less standard port 9995; for instructing nfdump/nfcapd to use a different port see the opFlow 3 Installation Guide.
(In legacy version 2.x, a different flow collector was used, and the default port was 12345; instructions for changing that can be found in the opFlow 2.x Installation Guide.

Sample Cisco Netflow Configuration

The following is a basic Cisco Router configuration for telling the router to send Netflow data to the opFlow.

! this command is optional, this will flow data about in-progress flows, very handy for large file transfers.
ip flow-cache timeout active 1
! version can be 5 or 9 with 9 add IPV4 template
ip flow-export version 5 
ip flow-export destination <opflow_server> 12345
!
interface FastEthernet0/0
 !only if you want output traffic
 ip flow ingress
 !only if you want input traffic
 ip flow egress

 

 

Sample Juniper J-Flow Configuration for SRX

J-FLow version 5 example (IPV4 only)

To keep things simple if you are only looking at IPV4 traffic then use Version 5 J-Flow example below.  As shown

interfaces {                            
    ge-0/0/0 {                          
        unit 0 {                        
            family inet {               
                sampling {              
                    input;              
                    output;  
                    
forwarding-options {                    
    sampling {                          
        input {                         
            rate 100;     
####   This means 1 in every 100 packets is sampled  DO NOT reduce this to 1 unless the router is very lightly loaded.                 
        }                               
        family inet {                   
            output {                    
                flow-server 192.168.1.1 {
                    port 12345;         
                    version 5; 
###  Version 5 is simplest but only supports IPV4      
                }                       
            }                           
        }                               
    }                                   
}

 

 

J-FLow version 9

J-FLow version 9 supports other protocols such as IPV6 and MPLS .  To get good results we recommend you still only use a template for IPV4 with Version 9.  There are some subtle differences with the SRX models for the config so please refer to J-Flow SRX version 9 Config Examples

 

 


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