Re: [LARTC] Load Balance and SNAT problem.

[Grant Taylor <gtaylor@riverviewtech.net>]

On 6/27/2007 3:03 AM, Peter Rabbitson wrote:
> I want the kernel to be able to realize that a gateway is no good for
> any destinations other than the specified netblock.

Would it be fair to say that you are wanting an administratively 
configurable "ignore addresses that fall with in this <network>" while 
deciding if a gateway is dead?

Obviously <network> would need to be a bit more than just an ip / 
netmask combination to make this realistic.

If this is what you are wanting, it may be possible to augment the 
kernel code that is used to detect dead gateways and have it check to 
see if the networks match a list (from somewhere in proc / sysfs / 
sysctl?) and not increment traffic counters.  I am presuming that it is 
the traffic counters that have to be incremented for the kernel to think 
that a route is still alive.  So, if you purposfully did not increment 
the counters, you could probably detect that a given gateway is no good. 
  I think you would have to add an additional route that was to the 
given network(s) that did not use such a feature to provide a way for 
the routing code to route to those network(s) that it no longer would 
get to via a default gateway.

What do you think?



Grant. . . .
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