kern/47749: NetBSD 6.0 Only Replies to First ICMP Echo (ping)

[genadmin%idlefortress.accessaxis.com@localhost]

>Number:         47749
>Category:       kern
>Synopsis:       NetBSD 6.0 Only Replies to First ICMP Echo (ping)
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 19 23:55:00 +0000 2013
>Originator:     Greg Schenzel
>Release:        NetBSD 6.0
>Organization:
unixdev.net
>Environment:
        
        
System: NetBSD idlefortress.accessaxis.com 6.0 NetBSD 6.0 (GENERIC.UP) sparc64
Architecture: sparc64
Machine: sparc64
>Description:
        NetBSD 6.0 only sends a reply for the first ICMP Echo received. Verified
        on NetBSD/sparc64. In the past I believe I've noticed this on 
NetBSD/i386
        and NetBSD/amd64 as well. IPFilter is enabled to allow all traffic on 
the
        internal interface (tlp0). tcpdump shows the requests coming in but only
        one reply going out. I dug through sysctl and didn't see any ICMP 
settings
        that might affect it. I've tried with Debian 6 and Solaris 9 ping
        utilities, but this is not an issue when pinging from the NetBSD system
        itself.
>How-To-Repeat:
        
>Fix: