Differences

en:online.net-wide-dhcpv6 [2014-08-29 09:21 UTC] rm		en:online.net-wide-dhcpv6 [2024-04-08 01:23 UTC] (current) rm
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	//Initially published on 2014-08-29//		//Initially published on 2014-08-29//
-	...and switching to it from Dibbler. Debian-only.	+	===== Pre-requisites =====
		+	Debian-only.
		+	Check the file ''/etc/modprobe.d/local.conf'', it may contain a line like this one:
		+	<code>options ipv6 disable=1</code>
		+	Since the default Debian kernel has IPv6 built-in rather than as a module, that line will not take effect. However it's better to remove or comment it out anyway, in case you install a different kernel later.
		+
		+	===== Installing WIDE DHCPv6 =====
	<file shell setup-dhcpv6.sh>		<file shell setup-dhcpv6.sh>
	#!/bin/bash		#!/bin/bash
	DUID=$1		DUID=$1
		+	IFACE=$2
-	skill -9 dibbler-client	+	if [ "$DUID" == "" ]||[ "$IFACE" == "" ]; then
-	dpkg -P dibbler-client	+	echo "Please specify your DUID and network interface!"
-	rm -rvf /etc/dibbler /var/log/dibbler /var/lib/dibbler	+	exit 1
		+	fi
	apt-get install -y wide-dhcpv6-client vim-common		apt-get install -y wide-dhcpv6-client vim-common
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	echo 'profile default { script "/etc/wide-dhcpv6/dhcp6c-script"; };' > /etc/wide-dhcpv6/dhcp6c.conf		echo 'profile default { script "/etc/wide-dhcpv6/dhcp6c-script"; };' > /etc/wide-dhcpv6/dhcp6c.conf
-	echo 'id-assoc pd { prefix-interface eth0 { }; };' >> /etc/wide-dhcpv6/dhcp6c.conf	+	echo "id-assoc pd { prefix-interface $IFACE { }; };" >> /etc/wide-dhcpv6/dhcp6c.conf
-	echo 'interface eth0 { send ia-pd 0; };' >> /etc/wide-dhcpv6/dhcp6c.conf	+	echo "id-assoc na { };" >> /etc/wide-dhcpv6/dhcp6c.conf
		+	echo "interface $IFACE { send ia-na 0; send ia-pd 0; };" >> /etc/wide-dhcpv6/dhcp6c.conf
	echo $DUID | awk '{ gsub(":"," "); printf "0: 0a 00 %s\n", $0 }' | xxd -r > /var/lib/dhcpv6/dhcp6c_duid		echo $DUID | awk '{ gsub(":"," "); printf "0: 0a 00 %s\n", $0 }' | xxd -r > /var/lib/dhcpv6/dhcp6c_duid
	/etc/init.d/wide-dhcpv6-client start</file>		/etc/init.d/wide-dhcpv6-client start</file>
-	Run this with your online.net DUID specified, for example:	+	Download and run this with the [[https://console.online.net/en/network/|online.net DUID for the subnet you want to use]] specified, and the uplink interface name, for example:
-	<code>./setup-dhcpv6.sh 00:03:00:01:23:45:67:89:AB:CD</code>	+	<code>
		+	wget -O setup-dhcpv6.sh https://version6.ru/_export/code/en/online.net-wide-dhcpv6?codeblock=1
		+	chmod +x setup-dhcpv6.sh
		+
		+	./setup-dhcpv6.sh 00:03:00:01:23:45:67:89:ab:cd eth0</code>
		+	When the WIDE setup screen appears and asks on which interfaces to listen for DHCPv6, leave that at its default value and just press Enter.
		+
		+	===== Startup failure =====
		+	Sometimes, for whatever reason, after running the above script, the DHCPv6 client fails to start. Just try:
		+
		+	<code>/etc/init.d/wide-dhcpv6-client restart</code>
		+
		+	...and this time it should start up properly.
		+
		+	===== Prevent outgoing request flood =====
		+	Very rarely (happened just once yet, in months), WIDE can fail in a mysterious way and start [[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=765453|sending SOLICIT requests continuously]], without any back-off time in between. This can be detected by upstream as malicious flood and make them unhappy.
		+
		+	To prevent this issue, add the following into your ip6tables configuration:
		+	<code>ip6tables -A OUTPUT -p udp --dport 547 -m limit --limit 10/min  --limit-burst 5 -j ACCEPT
		+	ip6tables -A OUTPUT -p udp --dport 547 -j DROP
		+	</code>
		+	...or just add this into ''/etc/rc.local'' if you don't use any other ip6tables rules.
		+
		+	===== Other HOWTOs =====
		+	* [[http://barfooze.de/stuff/online_ipv6.txt|Online.net IPv6 prefix discovery using KAME-dhcp6c on FreeBSD]] (thanks for the awk+xxd line)