https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194672
Bug ID: 194672
Summary: [carp] Changing advskew to 0 from another value
doesn't work
Product: Base System
Version: 10.1-RC2
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: c...@pfsense.org
When you configure advskew in CARP to be something other than 0, then try to
change it back to 0, FreeBSD refuses to do so. It can be changed to any value
other than 0, but never back to 0. This is a semi-common scenario, as it's how
people would generally demote a system from master to backup for maintenance or
other purposes, and would generally want to set it back to 0 afterwards.
Initially setting it to 0 works fine.
Tested on 10.0 release and 10.1-RC3, both behave the same. The following shows
the issue and how to replicate.
# ifconfig em0 vhid 55 advskew 0 pass PASSWORD alias 192.168.124.222/24
# ifconfig em0
em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
ether 00:0c:29:11:5e:be
inet 192.168.124.132 netmask 0xffffff00 broadcast 192.168.124.255
inet 192.168.124.222 netmask 0xffffff00 broadcast 192.168.124.255 vhid
55
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
carp: MASTER vhid 55 advbase 1 advskew 0
Change it, it'll work.
# ifconfig em0 vhid 55 advskew 100
# ifconfig em0 | grep carp:
carp: MASTER vhid 55 advbase 1 advskew 100
Try changing it back to 0, and it won't.
# ifconfig em0 vhid 55 advskew 0
# ifconfig em0 | grep carp:
carp: MASTER vhid 55 advbase 1 advskew 100
But can change it to 1 or other values.
# ifconfig em0 vhid 55 advskew 1
# ifconfig em0 | grep carp:
carp: MASTER vhid 55 advbase 1 advskew 1
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