[Bug 231526] [PATCH] fix for dhclient alias issue

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231526

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
                 CC|                            |cem at freebsd.org
         Resolution|---                         |DUPLICATE

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
Hm.  This patch provides a window where the ordering is wrong, right?  We
delete the old address and routes, then add the new address and routes (at this
point old alias is first), then with your patch remove the alias and re-add it
(now second).  Also, it unnecessarily removes and adds the unchanged alias
address, which I expect may break things like TCP connections.

Isn't the problem that we're (ipnat, ddclient, etc?) relying on address
ordering on an interface at all?  Alias is a special keyword to the ifconfig
command just to allow configuring >1 address, but aliases have no special
meaning in the kernel -- all addresses are equal and just hang off a linked
list from the interface ifp object.

Hypothetically we could add some sort of tagging via the ifa_flags field on
interface addresses in the kernel, but there's no room in the SIOCAIFADDR ioctl
for ifconfig to pass that additional information.

Duplicating this to the original bug and will follow up ipnat / ddclient issue
there.

*** This bug has been marked as a duplicate of bug 119801 ***

-- 
You are receiving this mail because:
You are the assignee for the bug.