Re: BGP Load Balancing

Consider this...
If outbound goes out using ISP A, it will use ISP A's public IP. All
returning traffic sourced from ISP A will come back through ISP A's circuit.
The same logic applies for ISP B. No matter which ISP the return traffic
comes back through, it'll always come back through the ISP that originated
the traffic.

The return traffic that went out ISP A won't come back via ISP B as ISP A
"owns/routes" their public IP block.

If you're using your own public block that is being routed in the Internet,
then that changes the pictures a bit.
If you're using a small /27 or something like that from each ISP, the
return traffic is guaranteed to come back on the circuit that it left on.

Ron

On Thu, Aug 30, 2012 at 9:16 AM, Nicky <ccienovice_at_gmail.com> wrote:

> Ron,
>
> The return traffic wont be load balanced as it totally depends on the ISP
> and the upstream ISP.
>
> Abraham,
>
> I dont have any such kind of scenario with me. I was just thinking on
> different BGP implementations. There is no NATing involved.
>
> Carlos has rightly mentioned that the networks would be originating from
> the customers network.
>
> Regards,
> Nick
>
>
>
> On Thu, Aug 30, 2012 at 3:27 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:
>
>> Ron, Abraham,
>> that depends. Remember that he IS running BGP, so he may just as well
>> have his own network/s and be originating with the same address regaardles
>> of outgoing interface ?
>>
>> -Carlos
>>
>> Abraham, Tharak @ 30/08/2012 02:04 -0300 dixit:
>>
>> Hey Nicky,
>>>
>>> What are your obervations with the trace ?
>>>
>>> If the ISP is NATting your traffic out then the incoming traffic will be
>>> load balanced, otherwise it doesn't.
>>>
>>> For outgoing. you have the control.
>>>
>>> If you can run BGP with the consent of both ISPs, then you would have
>>> better control with in and out flows.
>>>
>>> Best Regards,
>>> Tharak Abraham Luke
>>>
>>>
>>> On Tue, Aug 28, 2012 at 11:20 PM, ron wilkerson <ron.wilkerson_at_gmail.com
>>> >**wrote:
>>>
>>> The return traffic will be load shared as this will be determined by the
>>>> outgoing source IP.
>>>> With regards to traffic initiated from the outside towards your office,
>>>> I
>>>> don't know of a way to load share that traffic.
>>>> Not aware of a way to load share over 2 circuits for a single IP.
>>>>
>>>> You could manually do this via DNS I suppose.
>>>>
>>>> Hoping someone has a solution!
>>>>
>>>> Ron
>>>>
>>>>
>>>> On Tue, Aug 28, 2012 at 10:59 AM, Nicky <ccienovice_at_gmail.com> wrote:
>>>>
>>>> Hi All,
>>>>>
>>>>> If there are two ISP terminating on two different routers and only
>>>>>
>>>> default
>>>>
>>>>> route is accepted from ISP then can I load balance the traffic?
>>>>>
>>>>> AFAIK the outgoing traffic will be load balanced but not possible for
>>>>> incoming traffic.
>>>>>
>>>>> Regards,
>>>>> Nick
>>>>>
>>>>>
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>> --
>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

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Received on Sun Sep 02 2012 - 15:41:19 ART