diff --git a/srsepc/hdr/mbms-gw/mbms-gw.h b/srsepc/hdr/mbms-gw/mbms-gw.h
index 2beca7dcb..c238c0a18 100644
--- a/srsepc/hdr/mbms-gw/mbms-gw.h
+++ b/srsepc/hdr/mbms-gw/mbms-gw.h
@@ -49,6 +49,7 @@ const uint16_t GTPU_RX_PORT = 2152;
 typedef struct {
   std::string name;
   std::string sgi_mb_if_addr;
+  std::string sgi_mb_if_mask;
   std::string m1u_multi_addr;
 } mbms_gw_args_t;
 
diff --git a/srsepc/mbms.conf.example b/srsepc/mbms.conf.example
index 393be7648..d92306328 100644
--- a/srsepc/mbms.conf.example
+++ b/srsepc/mbms.conf.example
@@ -12,7 +12,8 @@
 #####################################################################
 [mbms_gw]
 name = srsmbmsgw01
-sgi_mb_if_addr = 172.16.1.1
+sgi_mb_if_addr = 172.16.0.254
+sgi_mb_if_mask = 255.255.255.255
 m1u_multi_addr = 239.255.0.1
 
 ####################################################################
diff --git a/srsepc/src/mbms-gw/main.cc b/srsepc/src/mbms-gw/main.cc
index a54f071c8..8aefc248d 100644
--- a/srsepc/src/mbms-gw/main.cc
+++ b/srsepc/src/mbms-gw/main.cc
@@ -99,8 +99,9 @@ parse_args(all_args_t *args, int argc, char* argv[]) {
   common.add_options()
 
     ("mbms_gw.name",      bpo::value<string>(&mbms_gw_name)->default_value("srsmbmsgw01"), "MBMS-GW Name")
-    ("mbms_gw.sgi_mb_if_addr",      bpo::value<string>(&mbms_gw_sgi_mb_if_addr)->default_value("172.16.1.1"), "SGi-mb TUN interface Address")
-    ("mbms_gw.m1u_multi_addr",      bpo::value<string>(&mbms_gw_m1u_multi_addr)->default_value("239.255.0.1"), "M1-u GTPu destination multicast address")
+    ("mbms_gw.sgi_mb_if_addr",      bpo::value<string>(&mbms_gw_sgi_mb_if_addr)->default_value("172.16.1.1"), "SGi-mb TUN interface Address.")
+    ("mbms_gw.m1u_multi_addr",      bpo::value<string>(&mbms_gw_sgi_mb_if_mask)->default_value("255.255.255.255"), "SGi-mb TUN interface mask.")
+    ("mbms_gw.m1u_multi_addr",      bpo::value<string>(&mbms_gw_m1u_multi_addr)->default_value("239.255.0.1"), "M1-u GTPu destination multicast address.")
 
     ("log.all_level",     bpo::value<string>(&args->log_args.all_level)->default_value("info"),   "ALL log level")
     ("log.all_hex_limit", bpo::value<int>(&args->log_args.all_hex_limit)->default_value(32),  "ALL log hex dump limit")
@@ -152,7 +153,9 @@ parse_args(all_args_t *args, int argc, char* argv[]) {
 
   args->mbms_gw_args.name = mbms_gw_name;
   args->mbms_gw_args.sgi_mb_if_addr = mbms_gw_sgi_mb_if_addr;
+  args->mbms_gw_args.sgi_mb_if_mask = mbms_gw_sgi_mb_if_mask;
   args->mbms_gw_args.m1u_multi_addr = mbms_gw_m1u_multi_addr;
+
   // Apply all_level to any unset layers
   if (vm.count("log.all_level")) {
     if(!vm.count("log.mbms_gw_level")) {
diff --git a/srsepc/src/mbms-gw/mbms-gw.cc b/srsepc/src/mbms-gw/mbms-gw.cc
index e29b6629f..b373df4e7 100644
--- a/srsepc/src/mbms-gw/mbms-gw.cc
+++ b/srsepc/src/mbms-gw/mbms-gw.cc
@@ -196,7 +196,7 @@ mbms_gw::init_sgi_mb_if(mbms_gw_args_t *args)
   }
 
   ifr.ifr_netmask.sa_family                                 = AF_INET;
-  ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr = inet_addr("255.255.255.0");
+  ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr = inet_addr(args->sgi_mb_if_mask.c_str());
   if (ioctl(sgi_mb_sock, SIOCSIFNETMASK, &ifr) < 0) {
     m_mbms_gw_log->error("Failed to set TUN interface Netmask. Error: %s\n", strerror(errno));
     close(m_sgi_mb_if);