--- authd-1.4.3/authd.c.old	2005-06-24 16:08:04.000000000 +0200
+++ authd-1.4.3/authd.c	2005-06-24 16:12:06.000000000 +0200
@@ -485,8 +485,19 @@
 
                 assert(opt.mapped != NULL);
                 strcpy(peer_128, opt.mapped); strcpy(host_128, opt.mapped);
-                strncpy(host_128, addr_hex, z);
-                strncpy(peer_128, peer_addr_hex, strlen(peer_addr_hex));
+
+                /*
+                   If mapping IPV4 to IPV6 space is enabled,
+                   take only last 4 numbers of IPV6
+                */
+                if(opt.mapped[0]) {
+                  strncpy(host_128, addr_hex+z-8, 8);
+                  strncpy(peer_128, peer_addr_hex, 8);
+                } else {
+                  strncpy(host_128, addr_hex, z);
+                  strncpy(peer_128, peer_addr_hex, strlen(peer_addr_hex));
+                }
+
                 if (strcmp(peer_128, host_128) != 0) return addr;
             }
             // hex addr must have even number of digits