NetBSD Problem Report #34588

From  Fri Sep 22 22:32:03 2006
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Date: Fri, 22 Sep 2006 21:29:03 GMT
Subject: net.inet.ip.hostzerobroadcast not respected by ip filter
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>Number:         34588
>Category:       kern
>Synopsis:       ip filter does not allow traffic to hosts at the base address of a subnet
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 22 22:35:00 +0000 2006
>Release:        NetBSD 4.0_BETA


System: NetBSD 4.0_BETA NetBSD 4.0_BETA (GRITTYKITTY-$Revision: 4.004 $) #1: Fri Sep 8 00:06:45 UTC 2006 macppc
Architecture: powerpc
Machine: macppc

When net.inet.ip.hostzerobroadcast is set and when a host is at the base 
address of a subnet, communication works except from machines behind ip 
filter's NAT. See:

Put a host at the base address of a subnet. On another machine which is on 
the same subnet, set net.inet.ip.hostzerobroadcast=1. Try to communicate 
with the host at the base address from somewhere that is behind NAT on the 
other machine.

None known.


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