https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213804
Bug ID: 213804
Summary: [carp]: packets got processes on the BACKUP node under
certain conditions
Product: Base System
Version: 10.3-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: e...@norma.perm.ru
Consider the following scheme:
+-----------------+
iface1 | | iface2
+-------| host A (MASTER) |--------
| | |
| +-----------------+
carp1
| +-----------------+
| | | iface2
+-------| host B (BACKUP) |-------- << packet to carp 1 IP
iface1 | |
+-----------------+
Lets assume both hosts are advertising themselves using rtadvd as ipv6 routers
for network attached to the iface2. In this case, they both can receive ipv6
packets undercertain conditions, destined to the CARP address carp1. When a
BACKUP node receives such packets, it processes them locally, regardless of the
state of the CARP, as if it was MASTER.
I observe this only on the ipv6, because the process of router advertising in
ipv6 is different from ipv4. However, I suppose the same rule applies to the
ipv4, but it's not that important, since I cannot imagine the configuration
that would reproduce this for ipv4.
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