Re: bonding mode 1 works as designed. Or not?

Stephen Hemminger
2006-02-14T22:04:10Z

On Tue, 14 Feb 2006 22:52:56 +0100
Heiko Gerstung <heiko@am-anger-1.de> wrote:

> Hi Willy,
>
> Willy Tarreau wrote:
> >> [...]eth0 and eth1 are in a bonding group, mode=1, miimon=100 ... eth0 is the
> >> active slave and used as long as the physical link is available (checked
> >> by using MII monitoring), at the same time eth1 is totally passive,
> >> neither passing any received packets to the kernel nor sending packets,
> >> if the kernel wants it to do so. As soon as the eth0 link status changes
> >> to "down", eth1 is activated and used, and now eth0 remains silent and
> >> deaf until it becomes the active slave again.
> >>
> >> Any comments on that? Is the documentation wrong OR is there a bug in
> >> the implementation of the bonding module?
> >>
> >
> > Neither, it's your understanding described above :-)
> > In fact, the bonding is used to select an OUTPUT device. If some trafic
> > manages to enter through the backup interface, it will reach the kernel.
> > It can be useful to implement some link health-checks for instance. However,
> > the only packets that you should receive are multicast and broadcast packets,
> > so this should be very limited anyway by design. After several years using
> > it, it has not caused me any trouble, including in environments involving
> > multicast for VRRP.
> >
> >
> Unfortunately the ping replies come in on both interfaces, as well as
> any other traffic (like ssh or web traffic). Everything works but the
> load of the system caused by network traffic is nearly doubled this way
> and may cause confusion in a number of applications.
>
> Would there be a way to stop the non-active slave(s) from "listening",
> i.e. drop all traffic received by them? If yes, where could I do that?
> > Regards,
> > willy
> >
> >

You will probably get a better answer if you ask the developers
directly.

BONDING DRIVER
P: Chad Tindel
M: ctindel@users.sourceforge.net
P: Jay Vosburgh
M: fubar@us.ibm.com
L: bonding-devel@lists.sourceforge.net
W: http://sourceforge.net/projects/bonding