Adding initial support for IPv6 in debconf container create script.

Note that this also removes support for non-CIDR IPv4 subnetmasks,
e.g. '255.255.255.0' now has to be specified as '24'.

Signed-off-by: Daniel Baumann <daniel.baumann@open-infrastructure.net>

4 files changed, 401 insertions, 71 deletions

diff --git a/share/scripts/debconf b/share/scripts/debconf
index fbabab4..46f0381 100755
--- a/share/scripts/debconf
+++ b/share/scripts/debconf
@@ -139,15 +139,6 @@ Chroot ()
 		${@}
 }
 
-CIDR ()
-{
-	x=${1##*255.}
-	set -- 0^^^128^192^224^240^248^252^254^ $(( (${#1} - ${#x})*2 )) ${x%%.*}
-
-	x=${1%%$3*}
-	echo $(( $2 + (${#x}/4) ))
-}
-
 Upgrade_system ()
 {
 	DIRECTORY="${1}"
@@ -474,11 +465,14 @@ EOF
 
 			if [ -n "${DIG}" ]
 			then
-				IPV4_ADDRESS1="$(${DIG} +short ${NAME} | tail -n1)"
+				IPV4_ADDRESS1="$(${DIG} A +short ${NAME} | tail -n1)"
 				IPV4_ADDRESS1_PART1="$(echo ${IPV4_ADDRESS1} | cut -d. -f1)"
 				IPV4_ADDRESS1_PART2="$(echo ${IPV4_ADDRESS1} | cut -d. -f2)"
 				IPV4_ADDRESS1_PART3="$(echo ${IPV4_ADDRESS1} | cut -d. -f3)"
 				IPV4_ADDRESS1_PART4="$(echo ${IPV4_ADDRESS1} | cut -d. -f4)"
+
+				IPV6_ADDRESS1="$(${DIG} AAAA +short ${NAME} | tail -n1)"
+				# TODO: address parts
 			fi
 
 			sed -e "s|@NAME@|${NAME}|g" \
@@ -487,6 +481,7 @@ EOF
 			    -e "s|@IPV4_ADDRESS1_PART2@|${IPV4_ADDRESS1_PART2}|g" \
 			    -e "s|@IPV4_ADDRESS1_PART3@|${IPV4_ADDRESS1_PART3}|g" \
 			    -e "s|@IPV4_ADDRESS1_PART4@|${IPV4_ADDRESS1_PART4}|g" \
+			    -e "s|@IPV6_ADDRESS1@|${IPV6_ADDRESS1}|g" \
 			"${FILE}" >> "${DIRECTORY}/preseed.cfg"
 		done
 
@@ -631,27 +626,50 @@ Configure_network ()
 	fi
 
 	# Create /etc/hosts
-	case "${NETWORK1_IPV4_METHOD}" in
-		none|dhcp)
+	rm -f "${DIRECTORY}/etc/hosts.tmp"
 
-cat > "${DIRECTORY}/etc/hosts.tmp" << EOF
-127.0.0.1	localhost	${NAME}
+	if [ -n "${NETWORK1_IPV4_ADDRESS}" ]
+	then
 
-# The following lines are desirable for IPv6 capable hosts
-::1	ip6-localhost ip6-loopback
-fe00::0	ip6-localnet
-ff00::0	ip6-mcastprefix
-ff02::1	ip6-allnodes
-ff02::2	ip6-allrouters
+cat >> "${DIRECTORY}/etc/hosts.tmp" << EOF
+${NETWORK1_IPV4_ADDRESS}	${NAME}
 EOF
 
-			;;
+	fi
+
+	if [ -n "${NETWORK1_IPV6_ADDRESS}" ]
+	then
+
+cat >> "${DIRECTORY}/etc/hosts.tmp" << EOF
+${NETWORK1_IPV6_ADDRESS}	${NAME}
+EOF
 
-		static)
+	fi
+
+	if [ -n "${NETWORK1_IPV4_ADDRESS}" ] || [ -n "${NETWORK1_IPV6_ADDRESS}" ]
+	then
+		echo >> "${DIRECTORY}/etc/hosts.tmp"
+	fi
+
+	if [ -z "${NETWORK1_IPV4_ADDRESS}" ] && [ -z "${NETWORK1_IPV6_ADDRESS}" ]
+	then
+		# localhost only
+
+cat > "${DIRECTORY}/etc/hosts.tmp" << EOF
+127.0.0.1	localhost	${NAME}
+::1		localhost	${NAME}
+EOF
+
+	else
 
 cat > "${DIRECTORY}/etc/hosts.tmp" << EOF
 127.0.0.1	localhost
-${NETWORK1_IPV4_ADDRESS}	${NAME}
+::1		localhost
+EOF
+
+	fi
+
+cat >> "${DIRECTORY}/etc/hosts.tmp" << EOF
 
 # The following lines are desirable for IPv6 capable hosts
 ::1	ip6-localhost ip6-loopback
@@ -661,9 +679,6 @@ ff02::1	ip6-allnodes
 ff02::2	ip6-allrouters
 EOF
 
-			;;
-	esac
-
 	mv "${DIRECTORY}/etc/hosts.tmp" "${DIRECTORY}/etc/hosts"
 }
 
@@ -684,54 +699,66 @@ Configure_systemd_networkd ()
 		eval IPV4_POST_UP="$`echo NETWORK${NUMBER}_IPV4_POST_UP`"
 		eval IPV4_POST_DOWN="$`echo NETWORK${NUMBER}_IPV4_POST_DOWN`"
 
-		if [ -z "${IPV4_METHOD}" ]
-		then
-			continue
-		fi
+		eval IPV6_COMMENT="$`echo NETWORK${NUMBER}_IPV6_COMMENT`"
+		eval IPV6_METHOD="$`echo NETWORK${NUMBER}_IPV6_METHOD`"
+		eval IPV6_ADDRESS="$`echo NETWORK${NUMBER}_IPV6_ADDRESS`"
+		eval IPV6_GATEWAY="$`echo NETWORK${NUMBER}_IPV6_GATEWAY`"
+		eval IPV6_NETMASK="$`echo NETWORK${NUMBER}_IPV6_NETMASK`"
+		eval IPV6_POST_UP="$`echo NETWORK${NUMBER}_IPV6_POST_UP`"
+		eval IPV6_POST_DOWN="$`echo NETWORK${NUMBER}_IPV6_POST_DOWN`"
 
-		IPV4_SUFFIX="$(CIDR ${IPV4_NETMASK})"
-		IPV4_CIDR="${IPV4_ADDRESS}/${IPV4_SUFFIX}"
+		if [ "${IPV4_METHOD}" != "none" ] || [ "${IPV6_METHOD}" != "none" ]
+		then
 
 cat > "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
 [Match]
 Name=eno${NUMBER}
+EOF
+
+		fi
+
+		if [ -n "${IPV4_METHOD}" ] && [ "${IPV4_METHOD}" != "none" ]
+		then
+
+cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
 
 [Network]
 EOF
 
-		if [ -n "${IPV4_COMMENT}" ]
-		then
-			echo "Description=${IPV4_COMMENT}" >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network"
-		fi
+			if [ -n "${IPV4_COMMENT}" ]
+			then
+				echo "Description=${IPV4_COMMENT}" >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network"
+			fi
 
-		case "${IPV4_METHOD}" in
-			dhcp)
+			case "${IPV4_METHOD}" in
+				dhcp)
 
 cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
 DHCP=ipv4
 EOF
 
-				;;
+					;;
 
-			static)
+				static)
 
 cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
 DHCP=no
-Address=${IPV4_CIDR}
+Address=${IPV4_ADDRESS}/${IPV4_NETMASK}
 EOF
 
-				if [ -n "${IPV4_GATEWAY}" ]
-				then
+					if [ -n "${IPV4_GATEWAY}" ]
+					then
 
 cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
 Gateway=${IPV4_GATEWAY}
 EOF
 
-				fi
-		esac
+					fi
+					;;
+			esac
 
-		if [ -n "${IPV4_POST_UP}" ]
-		then
+			if [ -n "${IPV4_POST_UP}" ]
+			then
 
 cat > "${DIRECTORY}/etc/systemd/system/cnt-ipv4-post-up-eno${NUMBER}.service" << EOF
 [Unit]
@@ -747,11 +774,11 @@ ExecStart=/bin/sh -c "${IPV4_POST_UP}"
 WantedBy=multi-user.target
 EOF
 
-			chroot "${DIRECTORY}" systemctl enable cnt-ipv4-post-up-eno${NUMBER}.service
-		fi
+				chroot "${DIRECTORY}" systemctl enable cnt-ipv4-post-up-eno${NUMBER}.service
+			fi
 
-		if [ -n "${IPV4_POST_DOWN}" ]
-		then
+			if [ -n "${IPV4_POST_DOWN}" ]
+			then
 
 cat > "${DIRECTORY}/etc/systemd/system/cnt-ipv4-post-down-eno${NUMBER}.service" << EOF
 [Unit]
@@ -767,7 +794,90 @@ ExecStart=/bin/sh -c "${IPV4_POST_DOWN}"
 WantedBy=multi-user.target
 EOF
 
-			chroot "${DIRECTORY}" systemctl enable cnt-ipv4-post-down-eno${NUMBER}.service
+				chroot "${DIRECTORY}" systemctl enable cnt-ipv4-post-down-eno${NUMBER}.service
+			fi
+		fi
+
+		if [ -n "${IPV6_METHOD}" ] && [ "${IPV6_METHOD}" != "none" ]
+		then
+
+cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
+
+[Network]
+EOF
+
+			if [ -n "${IPV6_COMMENT}" ]
+			then
+				echo "Description=${IPV6_COMMENT}" >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network"
+			fi
+
+			case "${IPV6_METHOD}" in
+				dhcp)
+
+cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
+DHCP=ipv6
+EOF
+
+					;;
+
+				static)
+
+cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
+DHCP=no
+Ipv6AcceptRA=no
+Address=${IPV6_ADDRESS}/${IPV6_NETMASK}
+EOF
+
+					if [ -n "${IPV6_GATEWAY}" ]
+					then
+
+cat >> "${DIRECTORY}/etc/systemd/network/eno${NUMBER}.network" << EOF
+Gateway=${IPV6_GATEWAY}
+EOF
+
+					fi
+					;;
+			esac
+
+			if [ -n "${IPV6_POST_UP}" ]
+			then
+
+cat > "${DIRECTORY}/etc/systemd/system/cnt-ipv6-post-up-eno${NUMBER}.service" << EOF
+[Unit]
+Description=${SOFTWARE} IPV6_POST_UP
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=/bin/sh -c "${IPV6_POST_UP}"
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+				chroot "${DIRECTORY}" systemctl enable cnt-ipv6-post-up-eno${NUMBER}.service
+			fi
+
+			if [ -n "${IPV6_POST_DOWN}" ]
+			then
+
+cat > "${DIRECTORY}/etc/systemd/system/cnt-ipv6-post-down-eno${NUMBER}.service" << EOF
+[Unit]
+Description=${SOFTWARE} IPV6_POST_DOWN
+After=network.target
+Wants=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/bin/sh -c "${IPV6_POST_DOWN}"
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+				chroot "${DIRECTORY}" systemctl enable cnt-ipv6-post-down-eno${NUMBER}.service
+			fi
 		fi
 
 		NUMBER="$((${NUMBER} + 1))"
@@ -796,8 +906,9 @@ Commands ()
 		for NUMBER in $(seq 2 ${NETWORK_NUMBER})
 		do
 			eval IPV4_METHOD="$`echo NETWORK${NUMBER}_IPV4_METHOD`"
+			eval IPV6_METHOD="$`echo NETWORK${NUMBER}_IPV6_METHOD`"
 
-			if [ -z "${IPV4_METHOD}" ]
+			if [ -z "${IPV4_METHOD}" ] && [ -z "${IPV6_METHOD}" ]
 			then
 				continue
 			fi
diff --git a/share/scripts/debconf.d/0002-preseed-debconf b/share/scripts/debconf.d/0002-preseed-debconf
index 9aca6bf..8877654 100755
--- a/share/scripts/debconf.d/0002-preseed-debconf
+++ b/share/scripts/debconf.d/0002-preseed-debconf
@@ -83,11 +83,13 @@ do
 
 	if [ -n "${DIG}" ]
 	then
-		IPV4_ADDRESS1="$(${DIG} +short ${NAME} | tail -n1)"
+		IPV4_ADDRESS1="$(${DIG} A +short ${NAME} | tail -n1)"
 		IPV4_ADDRESS1_PART1="$(echo ${IPV4_ADDRESS1} | cut -d. -f1)"
 		IPV4_ADDRESS1_PART2="$(echo ${IPV4_ADDRESS1} | cut -d. -f2)"
 		IPV4_ADDRESS1_PART3="$(echo ${IPV4_ADDRESS1} | cut -d. -f3)"
 		IPV4_ADDRESS1_PART4="$(echo ${IPV4_ADDRESS1} | cut -d. -f4)"
+
+		IPV6_ADDRESS1="$(${DIG} AAAA +short ${NAME} | tail -n1)"
 	fi
 
 	sed -e "s|@NAME@|${NAME}|g" \
@@ -96,6 +98,7 @@ do
 	    -e "s|@IPV4_ADDRESS1_PART2@|${IPV4_ADDRESS1_PART2}|g" \
 	    -e "s|@IPV4_ADDRESS1_PART3@|${IPV4_ADDRESS1_PART3}|g" \
 	    -e "s|@IPV4_ADDRESS1_PART4@|${IPV4_ADDRESS1_PART4}|g" \
+	    -e "s|@IPV6_ADDRESS1@|${IPV6_ADDRESS1}|g" \
 	"${DEBCONF_PRESEED_FILE}" > "${DIRECTORY}/preseed.cfg"
 
 	# Apply user specified preseed files
diff --git a/share/scripts/debconf.d/0003-debconf b/share/scripts/debconf.d/0003-debconf
index 684261a..02f80a6 100755
--- a/share/scripts/debconf.d/0003-debconf
+++ b/share/scripts/debconf.d/0003-debconf
@@ -674,19 +674,27 @@ Network_defaults ()
 
 	NETWORK1_VETH="${NETWORK1_VETH:-$VETH_NAME}"
 	NETWORK1_BRIDGE="${NETWORK1_BRIDGE:-bridge0}"
+
 	NETWORK1_IPV4_METHOD="${NETWORK1_IPV4_METHOD:-dhcp}"
 	NETWORK1_IPV4_ADDRESS="${NETWORK1_IPV4_ADDRESS:-192.168.1.2}"
-	NETWORK1_IPV4_NETMASK="${NETWORK1_IPV4_NETMASK:-255.255.255.0}"
+	NETWORK1_IPV4_NETMASK="${NETWORK1_IPV4_NETMASK:-24}"
+
+	NETWORK1_IPV6_METHOD="${NETWORK1_IPV6_METHOD:-none}"
+	NETWORK1_IPV6_ADDRESS="${NETWORK1_IPV6_ADDRESS:-fc00::2}"
+	NETWORK1_IPV6_NETMASK="${NETWORK1_IPV6_NETMASK:-7}"
 
-	if [ "${NETWORK1_IPV4_METHOD}" = "static" ] && [ -e /etc/resolv.conf ]
+	if [ "${NETWORK1_IPV4_METHOD}" = "static" ] || [ "${NETWORK1_IPV6_METHOD}" = "static" ]
 	then
-		NAMESERVER_SERVER="${NAMESERVER_SERVER:-$(if [ -e /etc/resolv.conf ]; then awk '/^nameserver / {$1=""; print $0}' /etc/resolv.conf; fi)}"
-		# Workaround to get rid of newlines since debconf can not handle multiline return value in assignments
-		NAMESERVER_SERVER="$(echo ${NAMESERVER_SERVER})"
+		if [ -e /etc/resolv.conf ]
+		then
+			NAMESERVER_SERVER="${NAMESERVER_SERVER:-$(awk '/^nameserver / {$1=""; print $0}' /etc/resolv.conf)}"
+			# Workaround to get rid of newlines since debconf can not handle multiline return value in assignments
+			NAMESERVER_SERVER="$(echo ${NAMESERVER_SERVER})"
 
-		NAMESERVER_DOMAIN="${NAMESERVER_DOMAIN:-$(if [ -e /etc/resolv.conf ]; then awk '/^domain / {$1=""; print $0}' /etc/resolv.conf; fi)}"
-		NAMESERVER_SEARCH="${NAMESERVER_SEARCH:-$(if [ -e /etc/resolv.conf ]; then awk '/^search / {$1=""; print $0}' /etc/resolv.conf; fi)}"
-		NAMESERVER_OPTIONS="${NAMESERVER_OPTIONS:-$(if [ -e /etc/resolv.conf ]; then awk '/^options / {$1=""; print $0}' /etc/resolv.conf; fi)}"
+			NAMESERVER_DOMAIN="${NAMESERVER_DOMAIN:-$(awk '/^domain / {$1=""; print $0}' /etc/resolv.conf)}"
+			NAMESERVER_SEARCH="${NAMESERVER_SEARCH:-$(awk '/^search / {$1=""; print $0}' /etc/resolv.conf)}"
+			NAMESERVER_OPTIONS="${NAMESERVER_OPTIONS:-$(awk '/^options / {$1=""; print $0}' /etc/resolv.conf)}"
+		fi
 	fi
 }
 
@@ -719,6 +727,27 @@ Network ()
 	db_get container/network1/ipv4-post-down
 	NETWORK1_IPV4_POST_DOWN="${RET}" # string (w/ empty)
 
+	db_get container/network1/ipv6-method
+	NETWORK1_IPV6_METHOD="${RET}" # select
+
+	db_get container/network1/ipv6-comment
+	NETWORK1_IPV6_COMMENT="${RET}" # string (w/ empty)
+
+	db_get container/network1/ipv6-address
+	NETWORK1_IPV6_ADDRESS="${RET}" # string (w/o empty)
+
+	db_get container/network1/ipv6-gateway
+	NETWORK1_IPV6_GATEWAY="${RET}" # string (w/ empty)
+
+	db_get container/network1/ipv6-netmask
+	NETWORK1_IPV6_NETMASK="${RET}" # string (w/o empty)
+
+	db_get container/network1/ipv6-post-up
+	NETWORK1_IPV6_POST_UP="${RET}" # string (w/ empty)
+
+	db_get container/network1/ipv6-post-down
+	NETWORK1_IPV6_POST_DOWN="${RET}" # string (w/ empty)
+
 	db_get container/nameserver/server
 	NAMESERVER_SERVER="${RET}" # string (w/ empty)
 
@@ -760,6 +789,27 @@ Network ()
 	db_set container/network1/ipv4-post-down "${NETWORK1_IPV4_POST_DOWN}"
 	db_fset container/network1/ipv4-post-down seen false
 
+	db_set container/network1/ipv6-method "${NETWORK1_IPV6_METHOD}"
+	db_fset container/network1/ipv6-method seen false
+
+	db_set container/network1/ipv6-comment "${NETWORK1_IPV6_COMMENT}"
+	db_fset container/network1/ipv6-comment seen false
+
+	db_set container/network1/ipv6-address "${NETWORK1_IPV6_ADDRESS}"
+	db_fset container/network1/ipv6-address seen false
+
+	db_set container/network1/ipv6-gateway "${NETWORK1_IPV6_GATEWAY}"
+	db_fset container/network1/ipv6-gateway seen false
+
+	db_set container/network1/ipv6-netmask "${NETWORK1_IPV6_NETMASK}"
+	db_fset container/network1/ipv6-netmask seen false
+
+	db_set container/network1/ipv6-post-up "${NETWORK1_IPV6_POST_UP}"
+	db_fset container/network1/ipv6-post-up seen false
+
+	db_set container/network1/ipv6-post-down "${NETWORK1_IPV6_POST_DOWN}"
+	db_fset container/network1/ipv6-post-down seen false
+
 	db_set container/nameserver/server "${NAMESERVER_SERVER}"
 	db_fset container/nameserver/server seen false
 
@@ -772,16 +822,16 @@ Network ()
 	db_set container/nameserver/options "${NAMESERVER_OPTIONS}"
 	db_fset container/nameserver/options seen false
 
-	db_settitle container/title
-	db_input high container/network1/ipv4-method || true
-	db_go
-
 	db_get container/network1/bridge
 	NETWORK1_BRIDGE="${RET}" # select
 
 	db_get container/network1/veth
 	NETWORK1_VETH="${RET}" # select
 
+	db_settitle container/title
+	db_input high container/network1/ipv4-method || true
+	db_go
+
 	db_get container/network1/ipv4-method
 	NETWORK1_IPV4_METHOD="${RET}" # select
 
@@ -813,16 +863,57 @@ Network ()
 			db_settitle container/title
 			db_input high container/network1/ipv4-post-down || true
 			db_go
+			;;
+	esac
+
+	db_settitle container/title
+	db_input high container/network1/ipv6-method || true
+	db_go
+
+	db_get container/network1/ipv6-method
+	NETWORK1_IPV6_METHOD="${RET}" # select
+
+	case "${NETWORK1_IPV6_METHOD}" in
+		none|dhcp)
+			;;
+
+		static)
+			db_settitle container/title
+			db_input high container/network1/ipv6-comment || true
+			db_go
+
+			db_settitle container/title
+			db_input high container/network1/ipv6-address || true
+			db_go
+
+			db_settitle container/title
+			db_input high container/network1/ipv6-gateway || true
+			db_go
+
+			db_settitle container/title
+			db_input high container/network1/ipv6-netmask || true
+			db_go
 
 			db_settitle container/title
-			db_input high container/nameserver/server || true
+			db_input high container/network1/ipv6-post-up || true
+			db_go
+
+			db_settitle container/title
+			db_input high container/network1/ipv6-post-down || true
 			db_go
 			;;
 	esac
 
+	if [ "${NETWORK1_IPV4_METHOD}" = "static" ] || [ "${NETWORK1_IPV6_METHOD}" = "static" ]
+	then
+		db_settitle container/title
+		db_input high container/nameserver/server || true
+		db_go
+	fi
+
 	NUMBER="1"
 
-	while db_get container/network${NUMBER}/ipv4-method && [ "${RET}" ]
+	while ( db_get container/network${NUMBER}/ipv4-method && [ "${RET}" ] ) || ( db_get container/network${NUMBER}/ipv6-method && [ "${RET}" ] )
 	do
 		if db_get container/network${NUMBER}/bridge
 		then
@@ -834,6 +925,13 @@ Network ()
 			eval NETWORK${NUMBER}_VETH="\"${RET}\"" # string (w/o empty)
 		fi
 
+		NUMBER="$((${NUMBER} + 1))"
+	done
+
+	NETWORK_NUMBER="$((${NUMBER} - 1))"
+
+	for NUMBER in $(seq 1 ${NETWORK_NUMBER})
+	do
 		if db_get container/network${NUMBER}/ipv4-comment
 		then
 			eval NETWORK${NUMBER}_IPV4_COMMENT="\"${RET}\"" # string (w/ empty)
@@ -868,11 +966,45 @@ Network ()
 		then
 			eval NETWORK${NUMBER}_IPV4_POST_DOWN="\"${RET}\"" # string (w/ empty)
 		fi
-
-		NUMBER="$((${NUMBER} + 1))"
 	done
 
-	NETWORK_NUMBER="$((${NUMBER} - 1))"
+	for NUMBER in $(seq 1 ${NETWORK_NUMBER})
+	do
+		if db_get container/network${NUMBER}/ipv6-comment
+		then
+			eval NETWORK${NUMBER}_IPV6_COMMENT="\"${RET}\"" # string (w/ empty)
+		fi
+
+		if db_get container/network${NUMBER}/ipv6-method
+		then
+			eval NETWORK${NUMBER}_IPV6_METHOD="\"${RET}\"" # select
+		fi
+
+		if db_get container/network${NUMBER}/ipv6-address
+		then
+			eval NETWORK${NUMBER}_IPV6_ADDRESS="\"${RET}\"" # string (w/o empty)
+		fi
+
+		if db_get container/network${NUMBER}/ipv6-gateway
+		then
+			eval NETWORK${NUMBER}_IPV6_GATEWAY="\"${RET}\"" # string (w/ empty)
+		fi
+
+		if db_get container/network${NUMBER}/ipv6-netmask
+		then
+			eval NETWORK${NUMBER}_IPV6_NETMASK="\"${RET}\"" # string (w/o empty)
+		fi
+
+		if db_get container/network${NUMBER}/ipv6-post-up
+		then
+			eval NETWORK${NUMBER}_IPV6_POST_UP="\"${RET}\"" # string (w/ empty)
+		fi
+
+		if db_get container/network${NUMBER}/ipv6-post-down
+		then
+			eval NETWORK${NUMBER}_IPV6_POST_DOWN="\"${RET}\"" # string (w/ empty)
+		fi
+	done
 
 	db_get container/nameserver/server
 	NAMESERVER_SERVER="${RET}" # string (w/ empty)
@@ -918,6 +1050,27 @@ Network ()
 
 		eval POST_DOWN="$`echo NETWORK${NUMBER}_IPV4_POST_DOWN`"
 		echo "NETWORK${NUMBER}_IPV4_POST_DOWN=\"${POST_DOWN}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
+
+		eval COMMENT="$`echo NETWORK${NUMBER}_IPV6_COMMENT`"
+		echo "NETWORK${NUMBER}_IPV6_COMMENT=\"${COMMENT}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
+
+		eval METHOD="$`echo NETWORK${NUMBER}_IPV6_METHOD`"
+		echo "NETWORK${NUMBER}_IPV6_METHOD=\"${METHOD}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
+
+		eval ADDRESS="$`echo NETWORK${NUMBER}_IPV6_ADDRESS`"
+		echo "NETWORK${NUMBER}_IPV6_ADDRESS=\"${ADDRESS}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
+
+		eval GATEWAY="$`echo NETWORK${NUMBER}_IPV6_GATEWAY`"
+		echo "NETWORK${NUMBER}_IPV6_GATEWAY=\"${GATEWAY}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
+
+		eval NETMASK="$`echo NETWORK${NUMBER}_IPV6_NETMASK`"
+		echo "NETWORK${NUMBER}_IPV6_NETMASK=\"${NETMASK}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
+
+		eval POST_UP="$`echo NETWORK${NUMBER}_IPV6_POST_UP`"
+		echo "NETWORK${NUMBER}_IPV6_POST_UP=\"${POST_UP}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
+
+		eval POST_DOWN="$`echo NETWORK${NUMBER}_IPV6_POST_DOWN`"
+		echo "NETWORK${NUMBER}_IPV6_POST_DOWN=\"${POST_DOWN}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
 	done
 
 	echo "NAMESERVER_SERVER=\"${NAMESERVER_SERVER}\"" >> "${DEBCONF_TMPDIR}/debconf.default"
diff --git a/share/scripts/debconf.d/0003-debconf.templates b/share/scripts/debconf.d/0003-debconf.templates
index 13899ef..73952a8 100644
--- a/share/scripts/debconf.d/0003-debconf.templates
+++ b/share/scripts/debconf.d/0003-debconf.templates
@@ -150,6 +150,9 @@ Default:
 Description: Ethernet Network Mask (IPv4)?
  What should be the netmask of the current system?
  .
+ Note that only the suffix is supported, e.g. '24'
+ for /24 or '16' for /16.
+ .
  This defaults to empty.
 
 Template: container/network1/ipv4-post-up
@@ -168,6 +171,66 @@ Description: Ethernet post-down Command (IPv4)?
  .
  This defaults to empty.
 
+Template: container/network1/ipv6-method
+Type: select
+Choices: static, none
+Default:
+Description: Ethernet Interface Method (IPv6)?
+ What method should be used to configure the ethernet interface?
+ .
+ This defaults to none.
+
+Template: container/network1/ipv6-comment
+Type: string
+Default:
+Description: Ethernet Interface Comment (IPv6)?
+ What optional comment would you like to give to the ethernet interface?
+ .
+ This defaults to empty.
+
+Template: container/network1/ipv6-address
+Type: string
+Default:
+Description: Ethernet IP Address (IPv6)?
+ What should be the IP address of the current system?
+ .
+ This defaults to fc00::1 (unique local unicast).
+
+Template: container/network1/ipv6-gateway
+Type: string
+Default:
+Description: Ethernet Gateway Address (IPv6)?
+ What should be the gateway address of the current system?
+ .
+ This defaults to empty.
+
+Template: container/network1/ipv6-netmask
+Type: string
+Default:
+Description: Ethernet Network Mask (IPv6)?
+ What should be the netmask of the current system?
+ .
+ Note that only the suffix is supported, e.g. '64'
+ for /64 or '48' for /48.
+ .
+ This defaults to empty.
+
+Template: container/network1/ipv6-post-up
+Type: string
+Default:
+Description: Ethernet post-up Command (IPv6)?
+ What should be the post-up command for eno1?
+ .
+ This defaults to empty.
+
+Template: container/network1/ipv6-post-down
+Type: string
+Default:
+Description: Ethernet post-down Command (IPv6)?
+ What should be the post-down command for eno1?
+ .
+ This defaults to empty.
+
 Template: container/nameserver/server
 Type: string
 Default: