diff --git a/aptsync/apt-mirror b/aptsync/apt-mirror
index 4cc8ca3..d8b867e 100644
--- a/aptsync/apt-mirror
+++ b/aptsync/apt-mirror
@@ -129,6 +129,9 @@ my @childrens       = ();
 my %skipclean       = ();
 my %clean_directory = ();
 
+# USTC mirror env
+my $bind_address = $ENV{'BIND_ADDRESS'};
+
 ######################################################################################
 ## Setting up $config_file variable
 
@@ -263,7 +266,11 @@ sub download_urls
 
         if ( $pid == 0 )
         {
-            exec 'wget', '--no-cache', '--limit-rate=' . get_variable("limit_rate"), '-t', '5', '-r', '-N', '-l', 'inf', '-o', get_variable("var_path") . "/$stage-log.$i", '-i', get_variable("var_path") . "/$stage-urls.$i", @args;
+            if (defined $bind_address) {
+                exec 'wget', '--bind-address', $bind_address, '--no-cache', '--limit-rate=' . get_variable("limit_rate"), '-t', '5', '-r', '-N', '-l', 'inf', '-o', get_variable("var_path") . "/$stage-log.$i", '-i', get_variable("var_path") . "/$stage-urls.$i", @args;
+            } else {
+                exec 'wget', '--no-cache', '--limit-rate=' . get_variable("limit_rate"), '-t', '5', '-r', '-N', '-l', 'inf', '-o', get_variable("var_path") . "/$stage-log.$i", '-i', get_variable("var_path") . "/$stage-urls.$i", @args;
+            }
 
             # shouldn't reach this unless exec fails
             die("\n\nCould not run wget, please make sure its installed and in your path\n\n");
diff --git a/aptsync/sync.sh b/aptsync/sync.sh
index 3280bbb..96d821c 100755
--- a/aptsync/sync.sh
+++ b/aptsync/sync.sh
@@ -8,6 +8,7 @@
 ## SET IN ENVIRONMENT VARIABLES
 #APTSYNC_URL=
 #APTSYNC_DISTS=
+#BIND_ADDRESS=
 
 set -e
 [[ $DEBUG = true ]] && set -x