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This small patch prevents Linux machines from responding differently to a
stealth scan for listening sockets. Very useful for those who would like =
to run
a secure shop. A printk() put in front of the changed line will allow log=
ging
of unusual packets.
Enjoy!
Taral
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--- linux/net/ipv4/tcp_input.c.orig=09Tue Mar 23 16:10:22 1999
+++ linux/net/ipv4/tcp_input.c=09Tue Mar 23 16:41:34 1999
@@ -2052,7 +2052,7 @@
=09=09=09goto discard;
=09=09}
=09=09
-=09=09goto discard;
+=09=09return 1;
=09=09break;
=20
=09case TCP_SYN_SENT:
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Received on Mar 26 1999
Intro
