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NETFLOW data not received from external router through ASA Firewall

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Hi

i'm using external cisco ROUTER 3640 running software version 12.1 , I configured it to send netflow data TO a server (wich is in my internal network) running solarwinds NPM v10.4.1 , and NTA v3.10 . the netflow data is supposed to flow through a Cisco ASA Firewall 5510

 

Router 3640 (F0/0) ====== (Ethernet 0/0) ASA Firewall 5510 ====== server running NTA (10.13.67.79)

 

the problem is that i'm unable de receive the netflow in my server 

 

ROUTER config

interface FastEthernet0/0

description *** Link to Firewall ***

bandwidth 1000

ip address 196.20.66.145 255.255.255.240

ip route-cache flow

ip policy route-map Traffic_to_SLC

speed 100

full-duplex

 

ip flow-export source FastEthernet0/0

ip flow-export version 5

ip flow-export destination 196.20.66.157 2055

 

Firewall Config

static (inside, outside) 196.20.66.157 10.13.67.79 netmask 255.255.255.255

access-list NETFLOW extend permit udp host 196.20.66.145 host 196.20.66.157 eq 2055

access-group NETFLOW in interface outside

 

any ideas to help me ???

thank's


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