Routing question -- multiple gateway setup?

[James Knott]

Ralph Doncaster wrote:
> On Sun, 22 Aug 2004, Robert Brockway wrote:
> 
> 
>>On Sun, 22 Aug 2004, James Knott wrote:
>>
>>
>>>Are your links with the same ISP?  I thought load balancing had to be
>>>configured at both ends.
>>
>>Depends on how the load balancing is done.  With MLPPP both physical links
>>appear to be one logical link so support is needed at both ends, but with
>>iproute2 the packets are sent out one link and then the other in turn.
> 
> 
> It may also be necessary to rebuild the kernel.
> CONFIG_IP_ROUTE_MULTIPATH
>   Normally, the routing tables specify a single action to be taken in
>   a deterministic manner for a given packet. If you say Y here
>   however, it becomes possible to attach several actions to a packet
>   pattern, in effect specifying several alternative paths to travel
>   for those packets. The router considers all these paths to be of
>   equal "cost" and chooses one of them in a non-deterministic fashion
>   if a matching packet arrives.
> 

Assuming you've got two ISPs connected and the packets are sent out via 
both, what address is specified for the source?  With TCP, you set up a 
socket consisting of address & port pairs.  How does having multiple 
ISPs affect that?
--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml