From 62744efa472886ea8fdeb262dcb184974e3f88de Mon Sep 17 00:00:00 2001 From: Stefan Agner Date: Tue, 16 Jun 2020 10:06:27 +0200 Subject: [PATCH] examples/udhcp/simple.script: fix IPv6 support when using udhcpc The udhcpc script calls ip addr flush .. which flushes addresses of any address family, including IPv6. However, busybox udhcpc is IPv4 only and should not influence IPv6 addressing. Hence use ip addr flush with family constraint. The script particularly broke IPv6 SLAAC: Typically when udhcpc calls the script the kernel already assigned the IPv6 link-local address. The flush removes the link-local IPv6 address again and prohibits proper IPv6 operation such as SLAAC since neighbor discovery protocol relies on IPv6 link-local addressing. Signed-off-by: Stefan Agner [Taken from https://git.openembedded.org/openembedded-core/commit/meta/recipes-core/busybox/files/simple.script?id=b77541dbb2f442e51842f9d24c8745a6df2d1478] Signed-off-by: Quentin Schulz Signed-off-by: Denys Vlasenko --- examples/udhcp/simple.script | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/examples/udhcp/simple.script b/examples/udhcp/simple.script index 6658fbeefa..f079ec8b84 100755 --- a/examples/udhcp/simple.script +++ b/examples/udhcp/simple.script @@ -18,7 +18,7 @@ case "$1" in deconfig) echo "Clearing IP addresses on $interface, upping it" if command -v ip >/dev/null; then - ip addr flush dev $interface + ip -4 addr flush dev $interface ip link set dev $interface up else ifconfig $interface 0.0.0.0