net/iproute2: clarify "waiting for IPv6 addresses"

Per bug 636846, a user thought that "waiting for IPv6 addresses" was
SLAAC (Stateless Autoconfiguration). In Linux, SLAAC is entirely
kernel-side, and the waiting is actually for DAD (duplicate address
detection) on link-local IPv6 addresses.

- Improve the message to include both DAD & tentative.
- If --verbose is used, print the tentative addresses.

If either of the accept_dad sysctls are set to zero, then the kernel
should NOT mark any addresses as tentative.
- net.ipv6.conf.all.accept_dad=0
- net.ipv6.conf.$IFACE.accept_dad=0

Bug: https://bugs.gentoo.org/636846
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/iproute2.sh b/net/iproute2.sh
index 6d7a3b5..d33ee11 100644
--- a/net/iproute2.sh
+++ b/net/iproute2.sh
@@ -463,7 +463,11 @@ iproute2_post_start()
 	# This block must be non-fatal, otherwise the interface will not be
 	# recorded as starting, and later services may be blocked.
 	if _iproute2_ipv6_tentative; then
-		einfon "Waiting for IPv6 addresses (${_dad_timeout} seconds) "
+		if [ "$EINFO_VERBOSE" = "yes" ]; then
+			veinfo "Found tentative addresses:"
+			LC_ALL=C ip -family inet6 addr show dev ${IFACE} tentative
+		fi
+		einfon "Waiting for tentative IPv6 addresses to complete DAD (${_dad_timeout} seconds) "
 		while [ $_dad_timeout -gt 0 ]; do
 			_iproute2_ipv6_tentative || break
 			sleep 1