2007/11/13, Willy Tarreau <[email protected]>:
> On Mon, Nov 12, 2007 at 02:57:16PM -0800, David Miller wrote:
> > From: "Chris Friesen" <[email protected]>
> > Date: Mon, 12 Nov 2007 16:43:24 -0600
> >
> > > 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.
> >
> > VLAN settings are a filter of sorts, much like plugging into
> > one switch or another filters traffic physically.
> >
> > If you don't want that filter, turn the VLAN settings off.
>
> I don't really agree with that view. Having spent a lot of time with
> tcpdump on production systems, I can say that sometimes you'd like to
> be aware that one of your VLANs is wrong and you'd simply like to
> sniff the wire to guess the correct tag. And on production, you simply
> cannot remove other VLANs, otherwise you disrupt the service.
>
I agree.
If I had a mis-plugged cable, I can guess it with tcpdump.
Because I cannot see the packets. It means no such packets on the wire 100%.
But if I had a incorrect vlan configuration, it's hard to sure.
In a case both of mis-plugged and mis-configured situation, I cannot
see anything.
Moreover, if I am configuring a machine via vlan interface which is
mis-configured partially, I cannot disable vlan hw acceleration
feature.
Thanks.
Joonwoo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
