[OpenWrt-Devel] [PATCH] odhcp6c : Silence mtu write error warnings

[Hans Dedecker]

Silence warning "daemon.notice netifd: wan6 (1139): sh: write error: Invalid argument"
when an invalid MTU is received via RA as kernel refuses to accept IPv6 mtu values
which are smaller than 1280 and bigger than the device mtu.

Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 package/network/ipv6/odhcp6c/files/dhcpv6.script | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/network/ipv6/odhcp6c/files/dhcpv6.script b/package/network/ipv6/odhcp6c/files/dhcpv6.script
index c307d09..46980cb 100755
--- a/package/network/ipv6/odhcp6c/files/dhcpv6.script
+++ b/package/network/ipv6/odhcp6c/files/dhcpv6.script
@@ -185,7 +185,7 @@ setup_interface () {
 	# Apply IPv6 / ND configuration
 	HOPLIMIT=$(cat /proc/sys/net/ipv6/conf/$device/hop_limit)
 	[ -n "$RA_HOPLIMIT" -a -n "$HOPLIMIT" ] && [ "$RA_HOPLIMIT" -gt "$HOPLIMIT" ] && echo "$RA_HOPLIMIT" > /proc/sys/net/ipv6/conf/$device/hop_limit
-	[ -n "$RA_MTU" ] && [ "$RA_MTU" -gt 0 ] && echo "$RA_MTU" > /proc/sys/net/ipv6/conf/$device/mtu
+	[ -n "$RA_MTU" ] && [ "$RA_MTU" -ge 1280 ] && echo "$RA_MTU" > /proc/sys/net/ipv6/conf/$device/mtu 2>/dev/null
 	[ -n "$RA_REACHABLE" ] && [ "$RA_REACHABLE" -gt 0 ] && echo "$RA_REACHABLE" > /proc/sys/net/ipv6/neigh/$device/base_reachable_time_ms
 	[ -n "$RA_RETRANSMIT" ] && [ "$RA_RETRANSMIT" -gt 0 ] && echo "$RA_RETRANSMIT" > /proc/sys/net/ipv6/neigh/$device/retrans_time_ms
 
-- 
1.9.1
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