diff -Nru systemd-232/debian/changelog systemd-232/debian/changelog
--- systemd-232/debian/changelog	2017-03-02 02:21:12.000000000 -0600
+++ systemd-232/debian/changelog	2017-03-10 16:08:02.000000000 -0600
@@ -1,3 +1,9 @@
+systemd (232-19ubuntu1) zesty; urgency=medium
+
+  * Enable IPV6 MTU configuration in .network files (LP: #1671951)
+
+ -- Ryan Harper <ryan.harper@canonical.com>  Fri, 10 Mar 2017 15:58:18 -0600
+
 systemd (232-19) unstable; urgency=medium
 
   [ Martin Pitt ]
diff -Nru systemd-232/debian/patches/ipv6-mtu-refresh.patch systemd-232/debian/patches/ipv6-mtu-refresh.patch
--- systemd-232/debian/patches/ipv6-mtu-refresh.patch	1969-12-31 18:00:00.000000000 -0600
+++ systemd-232/debian/patches/ipv6-mtu-refresh.patch	2017-03-10 16:04:33.000000000 -0600
@@ -0,0 +1,156 @@
+Description: networkd: add configuration for IPV6 MTU
+Author: Susant Sahani
+Bug-Ubuntu:
+Origin: https://github.com/systemd/systemd/pull/1533
+Last-Update: 20170310
+
+--- a/man/systemd.network.xml
++++ b/man/systemd.network.xml
+@@ -594,6 +594,12 @@
+         </para></listitem>
+         </varlistentry>
+         <varlistentry>
++          <term><varname>IPv6MTUBytes=</varname></term>
++          <listitem><para>Configures IPv6 maximum transmission unit (MTU).
++          An integer greater than or equal to 1280 bytes. Defaults to unset.
++        </para></listitem>
++        </varlistentry>
++        <varlistentry>
+           <term><varname>Bridge=</varname></term>
+           <listitem>
+             <para>The name of the bridge to add the link to.</para>
+--- a/src/network/networkd-link.c
++++ b/src/network/networkd-link.c
+@@ -2452,6 +2452,33 @@
+         return r;
+ }
+ 
++static int link_set_ipv6_mtu(Link *link) {
++        char buf[DECIMAL_STR_MAX(unsigned) + 1];
++        const char *p = NULL;
++        int r;
++
++        /* Make this a NOP if IPv6 is not available */
++        if (!socket_ipv6_is_supported())
++                return 0;
++
++        if (link->flags & IFF_LOOPBACK)
++                return 0;
++
++        if (link->network->ipv6_mtu == 0)
++                return 0;
++
++        p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
++
++        xsprintf(buf, "%u", link->network->ipv6_mtu);
++
++        r = write_string_file(p, buf, 0);
++        if (r < 0) {
++                log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
++        }
++
++        return 0;
++}
++
+ static int link_configure(Link *link) {
+         int r;
+ 
+@@ -2512,6 +2539,10 @@
+         if (r < 0)
+                 return r;
+ 
++        r = link_set_ipv6_mtu(link);
++        if (r < 0)
++                return r;
++
+         if (link_ipv4ll_enabled(link)) {
+                 r = ipv4ll_configure(link);
+                 if (r < 0)
+--- a/src/network/networkd-network-gperf.gperf
++++ b/src/network/networkd-network-gperf.gperf
+@@ -50,6 +50,7 @@
+ Network.Gateway,                        config_parse_gateway,                           0,                             0
+ Network.Domains,                        config_parse_domains,                           0,                             0
+ Network.DNS,                            config_parse_dns,                               0,                             0
++Network.IPv6MTUBytes,                   config_parse_ipv6_mtu,                          0,                             offsetof(Network, ipv6_mtu)
+ Network.LLMNR,                          config_parse_resolve_support,                   0,                             offsetof(Network, llmnr)
+ Network.MulticastDNS,                   config_parse_resolve_support,                   0,                             offsetof(Network, mdns)
+ Network.DNSSEC,                         config_parse_dnssec_mode,                       0,                             offsetof(Network, dnssec_mode)
+--- a/src/network/networkd-network.c
++++ b/src/network/networkd-network.c
+@@ -134,6 +134,7 @@
+         network->ipv6_accept_ra = -1;
+         network->ipv6_dad_transmits = -1;
+         network->ipv6_hop_limit = -1;
++        network->ipv6_mtu = -1;
+         network->duid.type = _DUID_TYPE_INVALID;
+         network->proxy_arp = -1;
+         network->arp = -1;
+@@ -850,6 +851,39 @@
+         return 0;
+ }
+ 
++
++int config_parse_ipv6_mtu(
++                const char *unit,
++                const char *filename,
++                unsigned line,
++                const char *section,
++                unsigned section_line,
++                const char *lvalue,
++                int ltype,
++                const char *rvalue,
++                void *data,
++                void *userdata) {
++
++        int *mtu = data;
++        int k, r;
++
++        assert(filename);
++        assert(lvalue);
++        assert(rvalue);
++
++        r = config_parse_int(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &k, userdata);
++        if (r < 0)
++                return r;
++
++        if (k < IPV6_MIN_MTU) {
++                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse IPv6 MTU for interface. Allowed minimum MTU is 1280 bytes ignoring: %s", rvalue);
++                return 0;
++        }
++
++        *mtu = k;
++
++        return 0;
++}
+ int config_parse_timezone(
+                 const char *unit,
+                 const char *filename,
+--- a/src/network/networkd-network.h
++++ b/src/network/networkd-network.h
+@@ -41,6 +41,8 @@
+ #define BRIDGE_VLAN_BITMAP_MAX 4096
+ #define BRIDGE_VLAN_BITMAP_LEN (BRIDGE_VLAN_BITMAP_MAX / 32)
+ 
++#define IPV6_MIN_MTU 1280
++
+ typedef enum DCHPClientIdentifier {
+         DHCP_CLIENT_ID_MAC,
+         DHCP_CLIENT_ID_DUID,
+@@ -118,6 +120,8 @@
+         bool dhcp_use_hostname;
+         DHCPUseDomains dhcp_use_domains;
+         bool dhcp_send_hostname;
++        unsigned ipv6_mtu;
++
+         bool dhcp_broadcast;
+         bool dhcp_critical;
+         bool dhcp_use_routes;
+@@ -224,6 +228,7 @@
+ int config_parse_dhcp_client_identifier(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+ int config_parse_ipv6token(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+ int config_parse_ipv6_privacy_extensions(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
++int config_parse_ipv6_mtu(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+ int config_parse_hostname(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+ int config_parse_timezone(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+ int config_parse_dhcp_server_dns(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
diff -Nru systemd-232/debian/patches/series systemd-232/debian/patches/series
--- systemd-232/debian/patches/series	2017-03-02 02:21:12.000000000 -0600
+++ systemd-232/debian/patches/series	2017-03-10 13:02:17.000000000 -0600
@@ -73,3 +73,4 @@
 debian/Revert-core-enable-TasksMax-for-all-services-by-default-a.patch
 debian/Let-graphical-session-pre.target-be-manually-started.patch
 debian/Add-env-variable-for-machine-ID-path.patch
+ipv6-mtu-refresh.patch