Subject: kern/34180: ping to deprecated IPv6 address is replied to with wrong source address
To: None <firstname.lastname@example.org, email@example.com,>
From: None <firstname.lastname@example.org>
Date: 08/10/2006 16:50:00
>Synopsis: ping to deprecated IPv6 address is replied to with wrong source address
>Arrival-Date: Thu Aug 10 16:50:00 +0000 2006
>Originator: Jan Andres
NetBSD delta.home.jan 4.0_BETA NetBSD 4.0_BETA (DELTA_PF) #2: Wed Aug 9 06:39:28 MEST 2006 email@example.com:/xfs/0/jan/nb/obj-alpha/sys/arch/alpha/compile/DELTA_PF alpha
The machine has an interface with an IPv6 address assigned for which the "deprecated" flag is set. When I send ping to that address from another machine, the echo reply's source address is different from the echo request's destination address: it's another, non-deprecated address assigned to the interface in question. If the deprecated address is the only global-scope address on the interface, the reply even originates from the interface's link-local address.
I'd expect the reply to come from the same address that the request was sent to, and that's also the behavior I observe on another machine running NetBSD 3.0.1.
1. Assign a deprecated IPv6 address to some interface.
2. Ping that address from another machine.