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Fri Sep 21 01:58:20 2018 user.notice -------cut-here-------: <----- stopping odhcpd
Fri Sep 21 01:58:21 2018 daemon.info odhcpd[8126]: Using a RA lifetime of 0 seconds on eth1
Fri Sep 21 01:58:21 2018 daemon.notice odhcpd[8126]: Failed to send to ff02::1%eth1 (Operation not permitted)
Fri Sep 21 01:58:21 2018 daemon.info odhcpd[8126]: Using a RA lifetime of 0 seconds on br-lan
Fri Sep 21 01:58:21 2018 daemon.debug odhcpd[8126]: Sent 64 bytes to ff02::1%br-lan
It did try sending RA message to eth1(WAN), got Operation not permitted error because of that ip6tables rule I've used above.
LGA1150:
Internet connection is DHCP(IPv4)/SLAAC(IPv6)
Current DHCP settings:
root@OpenWrt:~# uci show dhcp
dhcp.@dnsmasq[0]=dnsmasq
dhcp.@dnsmasq[0].domainneeded='1'
dhcp.@dnsmasq[0].localise_queries='1'
dhcp.@dnsmasq[0].local='/lan/'
dhcp.@dnsmasq[0].expandhosts='1'
dhcp.@dnsmasq[0].authoritative='1'
dhcp.@dnsmasq[0].readethers='1'
dhcp.@dnsmasq[0].leasefile='/tmp/dhcp.leases'
dhcp.@dnsmasq[0].rebind_protection='0'
dhcp.@dnsmasq[0].noresolv='1'
dhcp.@dnsmasq[0].localservice='0'
dhcp.@dnsmasq[0].nonwildcard='0'
dhcp.@dnsmasq[0].dnsforwardmax='1500'
dhcp.lan=dhcp
dhcp.lan.interface='lan'
dhcp.lan.start='100'
dhcp.lan.limit='150'
dhcp.lan.leasetime='12h'
dhcp.lan.ra='relay'
dhcp.lan.ndp='relay'
dhcp.wan=dhcp
dhcp.wan.interface='wan'
dhcp.wan.ignore='1'
dhcp.wan6=dhcp
dhcp.wan6.interface='wan'
dhcp.wan6.ra='relay'
dhcp.wan6.ndp='relay'
dhcp.wan6.master='1'
dhcp.odhcpd=odhcpd
dhcp.odhcpd.maindhcp='0'
dhcp.odhcpd.leasefile='/tmp/hosts/odhcpd'
dhcp.odhcpd.leasetrigger='/usr/sbin/odhcpd-update'
dhcp.odhcpd.loglevel='4'
When stopping the odhcpd service by either
/etc/init.d/odhcpd stop
orkillall odhcpd
in relay mode, an RA message is sent to WAN by mistake.Current workaround: dropping RA messages with ip6tables
ip6tables -A output_wan_rule -p icmpv6 --icmpv6-type 134 -j DROP
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