i bonded 2 NIC and specified VLAN tag of 11

cat /etc/sysconfig/network-scripts/ifcfg-bond0.11



ifconfig bond0.11 netmask 


tcpdump -i bond0.11 -n -e 

does not show any VLAN tags

even if there is any issue with physical interface or switch why dont i see tagged traffic in tcpdump when it enters interface.


That is correct behaviour: the interface bond0.11is a VLAN-aware interface, so the only traffic that you should see on it is traffic for the VLAN of which it is a member (11), after those frames have been selected and the VLAN tags removed.

If you dump bond0 you should see all the traffic that hits that physical interface, with tags intact.

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  • hey thanks,you are right,also can you tell me is it normal to see other traffic on bond0 that is taffic that are not part of that VLAN,i can see traffic of eth2 in tcpdump of eth1 – Blue Gene Jul 3 '14 at 11:58
  • I have no idea, because you haven't told me how eth1 and eth2 are addressed and connected. Are they the interfaces bonded to form bond0? If so, it's completely normal; otherwise it might be normal, or it might be weird. You might be better advised to open a new question about this - including a diagram, and all details of the various interfaces. – MadHatter Jul 3 '14 at 12:28

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