Use lagg(4) or Use Layer-4 Load Balancing?

[Vince Hoffman]

Martes G Wigglesworth wrote:
> I was attempting to find good information on how to achieve a type of
> bonding using advanced routing on FreeBSD, such as with layer-4 routers,
> that can bond multiple sources into a single overall larger source for
> logical backbone creation for networks.
> 

You could have a look at ng_one2many(4) I've never used it but it sounds 
like it could be what you are after according to the manpage.


Vince

> 
> On Wed, 2008-06-18 at 13:22 -0400, Andrew Thompson wrote:
>> On Tue, Jun 17, 2008 at 04:32:03AM -0400, Martes G Wigglesworth wrote:
>>> Greetings all.
>>>
>>> I have been attempting to research what  I have been informed is
>>> actually accomplished with layer-4 load balancing.  I have seen many
>>> articles and reviews that indicate that lagg(4) will accomplish the
>>> teaming of multiple internet access sorces into a single logical pipe,
>>> however, I have tried this using a dumb switch two nic interfaces and
>>> this simply is not the case.  
>>>
>>> I am new and may not have enough cool equipment around, however, aside
>>> from using the fail-over mode for redundancy, and lacp on a supported
>>> switch, then if lagg(4) could really combine multiple sources into one
>>> for use as a larger overall backbone, then I should be able to get
>>> doulbed bandwidth using two separate ports on an unmanaged switch using
>>> some option on the lagg(4) driver, which is not the cast.(if this is
>>> wrong I would be happy to get the correct information, however I have a
>>> few network engineer references that say that you cannot do anything
>>> more than layer-2 lacp with appropriate equipment to create an
>>> isp-supported trunk)  Even in the on-lamp interview the 7.0 developer
>>> implies that you can do what I am attempting to research however, it is
>>> not possible at layer 2 without an end-point.
>> How are you testing this? You need to have multiple IP flows in order to
>> fully utilise the multiple links. See this snippet from the handbook
>> (i'll put it in the man page too).
>>
>> "Since frame ordering is mandatory on Ethernet links then any traffic
>> between two stations always flows over the same physical link limiting
>> the maximum speed to that of one interface. The transmit algorithm
>> attempts to use as much information as it can to distinguish different
>> traffic flows and balance across the available interfaces."
>>
>>
>> Does that answer your question, you will not get more speed on a single
>> download.
>>
>>
>> Andrew
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> 
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