diff -Naur ncp-1.2.4/ncp.c ncp-1.2.4.patched/ncp.c
--- ncp-1.2.4/ncp.c	2005-05-13 13:17:53.000000000 -0400
+++ ncp-1.2.4.patched/ncp.c	2025-05-14 05:54:19.123650149 -0400
@@ -87,7 +87,7 @@
 
 int v6tcpsock() {
   int s;
-  if ((s=socket_tcp6())!=-1) {
+  if ((s=socket_tcp6b())!=-1) {
     if (socket_bind6_reuse(s,(char *)V6any,8002,0)!=-1)
       if (socket_listen(s,1)!=-1)
 	return s;
@@ -98,7 +98,7 @@
 
 int v4tcpsock() {
   int s;
-  if ((s=socket_tcp4())!=-1) {
+  if ((s=socket_tcp4b())!=-1) {
     if (socket_bind4_reuse(s,(char *)V6any,8002)!=-1)
       if (socket_listen(s,1)!=-1)
 	return s;
@@ -290,7 +290,7 @@
   }
 
   for (;;) {
-    s = socket_tcp6();
+    s = socket_tcp6b();
     if (s==-1)
       diesys(111,"socket");
     if (socket_bind6(s,(char *)V6any,0,0) == -1)
@@ -392,7 +392,7 @@
   char **newargv;
 
   carp("server mode.  waiting for connection.");
-  s = socket_tcp6();
+  s = socket_tcp6b();
   if (s == -1)
     diesys(111,"socket");
   if (socket_bind6_reuse(s,(char *)V6any,8002,0) == -1)
@@ -430,11 +430,12 @@
     diesys(111,"temporary unable to figure out IP address for ",*argv);
   if (out.len < 16)
     die(111,"no IP address for ",*argv);
-  s = socket_tcp6();
+  s = socket_tcp6b();
   if (s==-1)
     diesys(111,"socket");
   if (socket_bind6(s,(char *)V6any,0,0) == -1)
     diesys(111,"bind");
+  ndelay_off(s);
   if (socket_connect6(s,out.s,8002,0) == -1)
     diesys(111,"connection to ",*argv);
   ndelay_off(s);