[Bug 193280] New: CARP IPv6 NDP issue

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Sep 3 12:29:00 UTC 2014


            Bug ID: 193280
           Summary: CARP IPv6 NDP issue
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: thomas.wilhelm at inexio.net

Created attachment 146727
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=146727&action=edit

The system doesn'nt send  correct ndp neighbor solicitation messages for ipv6.
For these messages, carp uses the hardware-mac address of the interface and not
the virtual mac for the carp-ip. This ends up in packet-loss for the virtual
ipv6 address. 

On ipv4, the arp cache shows the virtual mac entry. (correct)
On ipv6, the ndp cache shows the hardware mac entry. <--problem

The interface is configured with two ipv4 virtual addresses and one ipv6
virtual address. 

The ipv4 addresses work like a charm.

The Wireshark attachement shows that the server sends the hardware-mac-address
instead of the virtual mac address ( 00:00:5e:00:01:01 )

FreeBSD XXHOSTNAMEXX 10.0-RELEASE-p7 FreeBSD 10.0-RELEASE-p7 #0: Tue Jul  8
06:37:44 UTC 2014    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

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