Yes, you are right, I should have paid closer attention to the output, however, what
I replied still apply to RADIX_MPATH in general.

Now, when I first introduced RADIX_MPATH, to get the (not always even) general load
balancing among interfaces attached to the same prefix, you only need to add the following
additional host routes, as in:

  route add -host gateway-ip -interface igb0
  route add -host gateway-ip -interface igb1

However, I just realized that strategy no longer work after the ARP entries are maintained
separately from the general routing table.

Let me think it through and try to come up with a patch.

--Qing

________________________________________
From: owner-freebsd-net@free... [owner-freebsd-net@free...] on behalf of David DeSimone [fox@veri...]
Sent: Tuesday, May 15, 2012 4:14 PM
To: freebsd-net@free...
Subject: Re: [stable-9]

Li, Qing <qing.li@blue...> wrote:
>
> The route selection is based on a hash function of source-ip and
> destination-ip when RADIX_MPATH is enabled. You do not need to perform
> specific actions, other than perhaps setting varying weights on each
> entry as an option. So depends on the traffic destination the chosen
> route may always be the same one.

These comments suggest that there are multiple routes to be selected
from.  However, this output:

> Internet:
> Destination        Gateway            Flags    Refs      Use  Netif
> Expire
> default            <redacted>         UGS         0 33320033   igb0
> XXX.XXX.XXX.0/25    link#1             U           0        0   igb0 =>
> XXX.XXX.XXX.0/25    link#2             U           0        0   igb1

suggests that there is only ONE default route, pointing to ONE
interface, igb0.  Without an extra default route that is also pointing
to igb1, I can't see how the system woudl ever forward traffic out igb1,
unless it was directed to the local /25.

--
David DeSimone == Network Admin == fox@veri...
  "I don't like spinach, and I'm glad I don't, because if I
   liked it I'd eat it, and I just hate it." -- Clarence Darrow


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