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As a first user, move the global carp(4) demotion counter
into the interface group. Thus we have the possibility
to define which carp interfaces are demoted together.
Put the demotion counter into the reserved field of the carp header.
With this, we can have carp act smarter if multiple errors occur.
It now always takes over other carp peers, that are advertising
with a higher demote count. As a side effect, we can also have
group failovers without the need of running in preempt mode.
The protocol change does not break compability with older
implementations.
Collaborative work with mcbride@
OK mcbride@, henning@
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ok deraadt millert
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so we must start to use u_int; ok cloder
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This converts if_link_state_change() to a generic usable
callback with dohooks().
OK henning@, camield@
Tested by camield@ and Alexey E. Suslikov
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which was removed in rev 1.57. This makes arpbalance work again, and
ensures that only one carp host will reply to a given arp request.
ok mpf@ pascoe@ dhartmei@ deraadt@
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Advertisements run through the carp interface first.
So we just take the address from ifp0.
While we're there,
also remove carp_macmatch6, which isn't used anymore.
Proposed by mcbride@
ok mcbride@, pascoe@
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ok pascoe@ mpf@
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matching in the bridge receive path to make CARP operate correctly
on physical interfaces that are participating in a bridge.
ok mcbride@ henning@ dlg@
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mcbride ok
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dealing with a carp interface.
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style as vlan(4). carp interfaces no longer require the physical interface
to be on the same subnet as the carp interface, or even that the physical
interface has an adress at all, so CARP can now be used on /30 networks.
ok deraadt@ henning@
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- convert counters to 64 bits
- remove junk from netstat
ok pb@
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- If the physical interface goes down or the link goes down,
the carp interface goes down as well.
- We treat this like the preemption holdoff with pfsync.
So if one of the carp interfaces is known to be bad (because the
physical interface it's associated with is bad), all the other carp
interfaces back off: they won't preempt, and their advskew goes to 240.
ok cedric@
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of gcc extensions have more of a chance.
ok mcbride@, no objections from millert@, deraadt@
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Pointed out by Marco Pfatschbacher, ok mickey@
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ok deraadt@
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Allows multiple hosts to share an IP address, providing high availability
and load balancing.
Based on code by mickey@, with additional help from markus@
and Marco_Pfatschbacher@genua.de
ok deraadt@
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