Messages in this thread | | | Date | Mon, 12 Nov 2007 14:54:35 -0800 | From | "Kok, Auke" <> | Subject | Re: [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel when promiscuous mode |
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Chris Friesen wrote: > David Miller wrote: > >> When you select VLAN, you by definition are asking for non-VLAN >> traffic to be elided. It is like plugging the ethernet cable >> into one switch or another. > > For max functionality it seems like the raw eth device should show > everything on the wire in promiscuous mode. > > If we want to sniff only the traffic for a specific vlan, we can sniff > the vlan device.
actually the impact can be quite negative, imagine doing a tcpdump on a 10gig interface with vlan's enabled - all of a sudden you might accidentally flood the system with a 100-fold increase in traffic and force the stack to dump all those packets for you.
I'm still very reluctant about this patch, I think the current situation is OK for everyone and offers everyone the possibility to do what they need, without hidden consequences.
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