FreeBSD CARP load balancing.

[Allan Jude]

On 2017-02-21 10:46, Rodney W. Grimes wrote:
>> On 2017-02-21 00:55, Gleb Popov wrote:
>>> On Mon, Feb 20, 2017 at 10:16 PM, Steven Hartland <killing at multiplay.co.uk>
>>> wrote:
>>>
>>>> On 20/02/2017 19:07, Gleb Popov wrote:
>>>>
>>>>
>>>> On Mon, Feb 20, 2017 at 12:01 PM, Steven Hartland <killing at multiplay.co.uk
>>>>> wrote:
>>>>
>>>>> Does LAGG do what you need?
>>>>
>>>>
>>>> Doesn't seem so. I need to balance incoming traffic between several hosts.
>>>> If I understood it correctly, lagg can be used to load-balance outgoing
>>>> traffic only.
>>>>
>>>>
>>>> LAGG does incoming and outgoing but only on a single host, so it does
>>>> sound like it won't help you.
>>>>
>>>> That said what your doing does sound quite out of the ordinary,
>>>>
>>>
>>>  So, that *net.inet.carp.arpbalance *sysctl was out of ordinary feature?
>>> That probably explains it.
>>>
>>> is there a reason you're trying to copy the traffic to multiple hosts?
>>>>
>>>
>>> Not copy, but distribute. I just don't want to wait current CARP master die
>>> to make another computer become active, but to switch between them in some
>>> fashion (round-robin or whatever).
>>>
>>>
>>>>
>>>> Might be a good idea to explain exactly what your trying to achieve.
>>>>
>>>>     Regards
>>>>     Steve
>>>>
>>> _______________________________________________
>>> freebsd-hackers at freebsd.org mailing list
>>> https://lists.freebsd.org/mailman/listinfo/freebsd-hackers
>>> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe at freebsd.org"
>>>
>>
>> I am not sure arpbalancing every worked very well. Without a hashing
>> algorithm or something, how would you actually make a TCP session work?
> 
> 8.xish man page:
> ARP level load balancing
>      The carp has limited abilities for	load balancing the incoming connec-
>      tions between hosts in Ethernet network.  For load	balancing operation,
>      one needs several CARP interfaces that are	configured to the same IP
>      address, but to a different VHIDs.	 Once an ARP request is	received, the
>      CARP protocol will	use a hashing function against the source IP address
>                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>      in	the ARP	request	to determine which VHID	should this request belong to.
>      If	the corresponding CARP interface is in master state, the ARP request
>      will be replied, otherwise	it will	be ignored.  See the EXAMPLES section
>      for a practical example of	load balancing.
> 
> 
> There is your hash.
> 

Ohh, cool.

I suppose it would be nice to have that feature back.

-- 
Allan Jude

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 834 bytes
Desc: OpenPGP digital signature
URL: <http://lists.freebsd.org/pipermail/freebsd-hackers/attachments/20170222/ac56b5db/attachment.sig>