Eric W. Biederman wrote:
Ben Greear <[EMAIL PROTECTED]> writes:
Patrick McHardy wrote:
Eric W. Biederman wrote:
For the macvlan code do we need to do anything special if we transmit
to a mac we would normally receive? Another unicast mac of the same
nic for example.
That doesn't happen under normal circumstances. I don't believe
it would work.
Assuming you mean you want to send between two mac-vlans on the same physical
nic...
This can work if your mac-vlans are on different subnets and you are
routing between them (and if you have my send-to-self patch or have
another way to let a system send packets to itself).
Ok. I didn't know if you could trigger this case without without
having then endpoints in separate namespaces. I was suspecting
the routing code would realize what we were doing realize the
route is local and route through lo.
The routing code will short-circuit by default. It takes quite
a bit of effort to make them _not_ short circuit..that is what I
was talking about. Mac-vlans will be just like any
other ethernet nics as far as routing goes.
A normal ethernet switch will NOT turn a packet around on the same
interface it was received, so that is why you must have them on different
subnets and have a router in between.
Yes. That is essentially the configuration I was wondering about.
For sending directly to yourself, something like the 'veth' driver
is probably more useful.
True. And I think it has a place. However the common case with
the tunnel devices is to just hook them all up to an ethernet
bridge as well as a real ethernet device.
The far ends of the ethernet tunnels are dropped into different namespaces.
Which gets a very similar effect to the mac vlan code.
I'm just wondering if I can not setup an ethernet tunnel device
when my primary purpose is to talk to the outside world, but occasionally
want a little in the box traffic.
mac-vlans should work on veth devices just fine, and the veths will also
short-circuit route (at least if they are in the same namespace).
I'm not sure I understand what you are trying to do..but in general
both veth and mac-vlans should act like ethernet nics..so if you can
find some way that does _not_ hold, please let us know.
Thanks,
Ben
Eric
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Ben Greear <[EMAIL PROTECTED]>
Candela Technologies Inc http://www.candelatech.com
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