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Date: Thu, 1 Nov 2001 00:03:34 -0800 (PST)
From: Jens Kassel <jens.kassel@enea.se>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: i386/31686: Problem with the timestamp option when flag equals zero
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>Number:         31686
>Category:       i386
>Synopsis:       Problem with the timestamp option when flag equals zero
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Nov 01 00:10:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Jens Kassel
>Release:        FreeBSD 4.3
>Organization:
Enea Realtime AB
>Environment:
FreeBSD labb4.enea.se 4.3-RELEASE FreeBSD 4.3-RELEASE #0: Wed Oct 3 16:18:02 CEST 2001   root@labb4.enea.se:/usr/src/sys/compile/JENSKERNEL i386
>Description:
When sending a Packet (ping) with the ip option timestamp and flag = 0.
Type = 68, Length = 8, Pointer = 5, oflw = 0, flag = 0, timestamp = 32 bits of zeros.

The respons is a echo reply (correct) but with the overflow flag set to 1 (incorrect) and no timestamp supplied.

Using flag = 1 or 3 gives the correct response.
>How-To-Repeat:
Create a IP packet with timestamp option (see above) + Icmp echo request and send it to the FreeBSD host/router. Check the timestamp option in the reply. The overflow flag is set but it should not.
>Fix:
I guess timestamp with only timestamp is not implemented. It seems like timestamp with timestamp + IP address is only implemented.
>Release-Note:
>Audit-Trail:
>Unformatted:

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