03-21-2011
OK I found it, with Google's help...
Apparently I need to add 'vlan and ...' to my filter expression when VLANs are used. Without filter expression, tcpdump and libpcap just output everything, but as soon as filters are specified, the vlan tagging needs to be specified.
See here
Blog Stéphane Bortzmeyer: Un exemple de panne amusante de tcpdump
Hope it is useful to others as well.
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LEARN ABOUT DEBIAN
ovs-tcpundump
ovs-tcpundump(1) Open vSwitch Manual ovs-tcpundump(1)
NAME
ovs-tcpundump - convert ``tcpdump -xx'' output to hex strings
SYNOPSIS
ovs-tcpundump < file
Common options:
[-h | --help] [-V | --version]
DESCRIPTION
The ovs-tcpundump program reads tcpdump -xx output on stdin, looking for hexadecimal packet data, and dumps each Ethernet as a single hexa-
decimal string on stdout. This format is suitable for use with the ofproto/trace command supported by ovs-vswitchd(8) via ovs-appctl(8).
At least two -x or -X options must be given, otherwise the output will omit the Ethernet header, which prevents the output from being using
with ofproto/trace.
OPTIONS
-h, --help
Prints a brief help message to the console.
-V, --version
Prints version information to the console.
SEE ALSO
ovs-appctl(8), ovs-vswitchd(8), ovs-pcap(1), tcpdump(8), wireshark(8).
Open vSwitch December 2010 ovs-tcpundump(1)