Linux 3.7.10 listens on UDP port 8472 but no PID shown by netstat :

# netstat -nlp | awk '{if ($NF == "-")print $0}'
udp    15872      0 0.0.0.0:8472            0.0.0.0:*                           -

# netstat -tlnpu
Connexions Internet actives (seulement serveurs)
Proto Recv-Q Send-Q Adresse locale          Adresse distante        Etat        PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      12279/sshd
tcp6       0      0 :::25                   :::*                    LISTEN      29701/master
tcp6       0      0 :::443                  :::*                    LISTEN      11660/apache2
tcp6       0      0 :::80                   :::*                    LISTEN      11660/apache2
udp        0      0 127.0.0.1:53            0.0.0.0:*                           11448/named
udp    15872      0 0.0.0.0:8472            0.0.0.0:*                           -

lsof doesn't show anything:
# lsof -i :8472
#

# lsof -i :22
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sshd    12279   root    3u  IPv4  10718      0t0  TCP *:ssh (LISTEN)
sshd    12279   root    4u  IPv6  10720      0t0  TCP *:ssh (LISTEN)

nor does fuser:
# fuser -n udp 8472
#

# fuser -n tcp 22
22/tcp:              12279 12311 12314

See here: http://serverfault.com/a/51997/46213 : kernel threads might now show up.

What is this port? 

# grep 8472 /etc/services : no results 

# grep 8472 nmap-services
otv     8472/tcp        0.000076        # Overlay Transport Virtualization (OTV)


Mmmh. OTV. Sounds like networking. 10s of google-fu later I find this: 
http://openvswitch.org/pipermail/dev/2012-November/023461.html

Great, some progress. OTV -> Openvswitch -> VXLAN -> idea :

# grep VXLAN /boot/config-`uname -r`
CONFIG_VXLAN=y

Ok so the kernel is listening because of this. Gotcha.