I'm currently battling this with one of my new installations. First, the
collector listens to the routers on port 2055, it communicates with cflowd
on port 2056 (both are defaults.) So you should be doing tcpdump looking
for port 2055 (not 2255, unless you've changed it from the default.) Using
netstat, UDP port 2055 should be listed, but probably in idle. Also, it may
be the case that a firewall somewhere between the router and your collector
is dropping your packets.
At 07:54 AM 07/05/2001 -0700, you wrote:
>I would like to ask the help of people who have cflowd up and running
>on thier boxes and are
>receiving flows. I have install cflowd on a PIII 450 RH Linux 7.1 box
>with 256MB and have yet to
>receive flows even though I am currently getting no error messages.
>Whenever I do a tcp dump The
>only communication that I see between my routers (7507, 6509 w/ msfc)
>and my collecter are snmp
>requests and responses. However I was told that if I run 'tcpdump -n
>udp port 2255' (2056 is the
>port that I am using to recieve upd flows) i should see something
>similar to this:
>collector# tcpdump -n udp port 2255
>tcpdump: listening on all devices
>12:11:29.953100 10.0.0.1.1868 > 10.0.0.2.2255: udp 1168
>12:11:29.965310 10.0.0.1.1868 > 10.0.0.2.2255: udp 1168
>12:11:29.967780 10.0.0.1.1868 > 10.0.0.2.2255: udp 1168
>12:11:29.985854 10.0.0.1.1868 > 10.0.0.2.2255: udp 1168
>12:11:29.998673 10.0.0.1.1868 > 10.0.0.2.2255: udp 1168
>12:11:29.009464 10.0.0.1.1868 > 10.0.0.2.2255: udp 1168
>but I do not.
>When I do 'netstat -an' the tcp port is listening but not the udp port.
>Is this regular or is
>there a problem here? Any help is appreciated.
>Academic Computing & Networking Services
>Florida State University
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This archive was generated by hypermail 2b29 : Thu Jul 05 2001 - 11:31:14 PDT