--- /usr/bin/mosh	2018-02-05 16:51:10.000000000 +0000
+++ fs2mosh	2019-07-28 10:54:53.301725339 +0100
@@ -187,7 +187,9 @@
 }
 
 if ( not grep { $_ eq $use_remote_ip } qw { local remote proxy } ) {
-  die "Unknown parameter $use_remote_ip";
+  if ($use_remote_ip !~ /^gateway:/) {
+    die "Unknown parameter $use_remote_ip";
+  }
 }
 
 $family = lc( $family );
@@ -432,6 +434,23 @@
   }
   waitpid $pid, 0;
   close $pipe;
+  
+	if ( $use_remote_ip =~ '^gateway:(.*)$' ) {
+		# "parse" the host from what the user gave us
+		my $shost = $1;
+		# get list of addresses
+		my @res = resolvename( $shost, 22, $family );
+		# Use only the first address as the Mosh IP
+		my $hostaddr = $res[0];
+		if ( !defined $hostaddr ) {
+			die( "could not find address for gateway host $shost" );
+		}
+		my ( $err, $addr_string, $service ) = getnameinfo( $hostaddr->{addr}, NI_NUMERICHOST );
+		if ( $err ) {
+			die( "could not use address for gateway host $shost" );
+		}
+		$ip = $addr_string;
+	}
 
   if ( not defined $ip ) {
     if ( defined $sship ) {