Re: Kernel load balancing

[Chuck Swiger]

Derek Marcotte wrote:
[ ... ]
I would like to know where I can find out if FreeBSD spreads the
network load across 2 interfaces of equal weight to the same
subnet, or if it just tries to push everything out the lowest
numbered interface.
FreeBSD doesn't want you to put multiple NICs on the same subnet, modulo the 
following section from man bridge:

 By putting both physical and logical (vlanX) interfaces in the same clus-
 ter, a FreeBSD box can also implement what in commercial terms is called
 a trunk interface. This means packets coming from one of the interfaces
 in the cluster, will appear on the wire on the parent interfaces of any
 vlan interface belonging to the cluster, with the proper VLAN tag. Simi-
 larly, packets coming from a parent interface, will have the VLAN tag
 stripped and will be forwarded to other interfaces on the same cluster.
 See the EXAMPLES section for more details.
Do you want to do trunking for extra bandwidth, for redundancy in case of 
failure...what problem are you trying to solve?

--
-Chuck
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Re: Kernel load balancing

[Derek Marcotte]

 Do you want to do trunking for extra bandwidth, for redundancy
in case of
 failure...what problem are you trying to solve?

Exactly... Both.  Ok, so let's make this a little more complex.
Here's how I envisioned this working.

Subnet A 192.168.0.0/24
Subnet B 192.168.1.0/24

Subnet C 192.168.2.0/30
Subnet D 192.168.2.4/30

Router 1
fxp0 192.168.0.1/24
fxp1 192.168.2.1/30
fxp2 192.168.2.5/30

Router 2
fxp0 192.168.1.1/24
fxp1 192.168.2.2/30
fxp2 192.168.2.6/30

router1 route add 192.168.1.0/24 192.168.2.2
router1 route add 192.168.1.0/24 192.168.2.6

router2 route add 192.168.0.0/24 192.168.2.1
router2 route add 192.168.0.0/24 192.168.2.5


(may wrap)
SubnetA---fxp0---router1fxp1 Subnet
C fxp1router2---fxp0---SubnetB


SubnetA---fxp0---router1fxp2 Subnet
D fxp2router2---fxp0---SubnetB


I intend to run Zebra and OSPF on routers 1 and 2.  Subnets A and
B are 100 Mbit/s networks.  Subnets C and D are 10 Mbit/s
networks, I would like to have a ~20 Mbit/s pipe when both lines
are up, but if one fails, it dumbs down to ten.  I am familiar
with OSPF enough to (hopefully :) make it through the routing and
failover, but I don't feel that Zebra will give me a 20 Mbit
pipe.

I am thinking about this in a routing frame of mind... Perhaps if
there is a way to just pair up the adapters at the ethernet
level it would be a simpler solution, but it would have to be
able to fail over without blinking...  I do not of such a
capacity in FreeBSD, but if there is one, I would love to hear
about it.

Does this help to clarify the situation?

Cheers,
Derek

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