setting promisc mode kills vlans on devices with hwtagging (em, re ...)

[Iasen Kostov]

    Hi,
if you setup a vlan devices with parent one of emX or reX (this what I 
have at the moment)
which has hardware vlan tagging just try to run tcpdump (without -p) and 
the vlans will
die :). That doesn't happen with parent devices not supporting 
hwtagging. And this totally
excludes possibility to run a bridge over vlans with parent device which 
support hwtaggs.
And something else was observed with re driver - it is impossible to 
disable hwtaggs by
-vlanhwtag neither you can disable vlan mtu :).