Re: [LARTC] Redundant internet connections.

[Grant Taylor <gtaylor@riverviewtech.net>]

On 06/21/07 16:01, Alex Samad wrote:
> should something like this work
> 
> default  proto static  metric 5
> 	nexthop via 58.173.108.1  dev vlan2 weight 10
> 	nexthop via 10.20.20.106  dev ppp0 weight 20
> 
> and then let the dgd detect dead gateways and drop the relevant route
> about.

Doesn't this use "Equal Cost Multi Path" (ECMP) routing?

If so, how does this take in to account that I do not want any of the 
traffic to run over the backup connection unless the primary is down?

It is my understanding that the weights of an ECMP route are for a 
fraction of the traffic.  I.e. 10/30 and 20/30 of the traffic will use 
each of the routes.

(Note:  I state 10/30 and 20/30 because the man page indicates that 
10/30 does not equal 1/3.  Namely because the kernel creates an in 
memory route for each weight for each route.  Thus if you use a weight 
of 10, there will be 10 routes in memory.)



Grant. . . .
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