Hi. Running a standard OpenBSD 5.1 installation with 2 hosts (virtual for this test).
The only things changed from default is that I added three interfaces (em0, carp1 and carp2). The problem is that I can't get Host 1 back as master automatically if Host 2 becomes master. On the first test I booted up Host 1 first and then Host 2. Host 1 is master as it should. If I force carp2 down on Host 1 then Host 2 becomes master of carp2 as it should but it will not be master again if I bring the interface back. With preempt enabled the entire host group "carp" should become slave on Host 1 but only the interface that I bring down till become slave. From: http://www.openbsd.org/faq/pf/carp.html regarding net.inet.carp.preempt Allow hosts within a redundancy group that have a better advbase and advskew to preempt the master. In addition, this option also enables failing over a group of interfaces together in the event that one interface goes down. If one physical CARP-enabled interface goes down, CARP will increase the demotion counter, carpdemote, by 1 on interface groups that the carp(4) interface is a member of, in effect causing all group members to fail-over together. net.inet.carp.preempt is 0 (disabled) by default. Host 1 hostname.em0 up hostname.carp1 192.168.1.1 vhid 1 carpdev em0 hostname.carp2 192.168.2.1 vhid 2 carpdev em0 Host 2 hostname.em0 up hostname.carp1 192.168.1.1 vhid 1 advskew 200 carpdev em0 hostname.carp2 192.168.2.1 vhid 2 advskew 200 carpdev em0 I have tried both advskew 100 and 200 with the same results. When does all group members fail over to backup and when does a interface with a lower advskew become master again? For me it's seems like a master is a master as long as every thing it's OK, the adskew does not do anything. Best regards Johan
