Netflow and Cisco 6509

I have a server that I would like to make my netflow collection server.  I am trying to setup my 6509 to send netflow traffic from a specific vlan to the collection server.  Here is what I have so far, the parts of my cfg that are relevant :

int vlan25
 ip address 172.16.25.251 255.255.255.0
 ip route-cache flow
no mls acl tcam share-global
mls netflow interface
mls flow ip interface-full
no mls flow ipv6
mls nde sender version 5
mls cef error action freeze
mls nde sender version 5
ip flow ingress layer2-switched vlan 25
ip flow export layer2-switched vlan 25
ip flow-export destination SERVERIPINDIFFERENTNETWORK 9996

Very strange, I cannot seem to ping 172.16.25.251 from anywhere.  Which I assume is my bigger issue, but then:

 Total Netflow Data Export Packets are:
    0 packets, 0 no packets, 0 records