Patch-ID# 100303-01
Keywords: tcp loop using loopback
Synopsis: SunOS 4.1.1;4.1: system freezes using loopback interface
Date: 21-May-91

SunOS release: 4.1 4.1.1

Topic: tcp loop using loopback

BugID's fixed with this patch: 1047408

Architectures for which this patch is available: sun3 sun3x sun4 sun4c

Patches which may conflict with this patch:

Obsoleted by:

Problem description:

Under certain conditions the tcp code gets in a loop
and sends constant acks, when using the loopback
interface, this can freeze the system.


INSTALL:
As root:
# mv /sys/sun{3,3x,4,4c}/OBJ/tcp_input.o /sys/sun{3,3x,4,4c}/OBJ/tcp_input.o.FCS
# cp sun{3,3x,4,4c}/tcp_input.o /sys/sun{3,3x,4,4c}/OBJ/tcp_input.o
# chmod 444 /sys/sun{3,3x,4,4c}/OBJ/tcp_input.o
 
   Then a new kernel will need to be configured, made and installed.
Please refer to the System and Networking Administration manual for details.