Grant Taylor wrote:
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.
Something along these lines, yes. Except that instead of a
packet-counter there is a resettable timer, that gets reset anytime a
matching packet comes in. When the timer goes over a specified limit -
gateway is dead.
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.
This would be a manual task for the administrator, there is no place for
this in-kernel.
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