How to use tcpdump on Openvswitch interfaces ?
Issue
- Running a tcpdump on a openvswitch interface does not work.
- This fails with the following error:
# tcpdump -npi phy-br-bond-d -vvvs0 -w /tmp/phy-br-bond-d.cap
tcpdump: phy-br-bond-d: That device is not up
- OR It can fail with :
# tcpdump -npi patch-tun -vvvs0 -w /tmp/int-br-ctlplane.cap
tcpdump: patch-tun: No such device exists
(SIOCGIFHWADDR: No such device)
- How to capture a tcpdump in this case?
Environment
- Red Hat Enterprise Linux Openstack
- Openvswitch configured with the following configuration:
+------[ COMPUTE HOST ]------+
|+----------+ +----------+|
|| INSTANCE | | INSTANCE ||
|| | | ||
|+--[eth0]--+ +--[eth0]--+|
| | | |
|+--[tapX]--+ +--[tapX]--+|
|| qbrX | | qbrX ||
|+--[qvbX]--+ +--[qvbX]--+|
| | | |
| +---+ +---+ |
| | | |
| +--[qvoX]---[qvoY]--+ |
| | br-int | |
| +---[int-br-eth1]---+ |
| | |
| +---[phy-br-bond-d]-+ |
| | br-bond-d | |
| +------[bond-d]-----+ |
| | |
| +---------+---+ |
| | | |
+---[eno1]--------[enod2]-----+
| +-------------- +
+-----| INTERNAL VLAN |
+---------------+
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