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Date: Tue, 13 Apr 2004 17:38:48 +0200
From: Joost Bekkers <joost@jodocus.org>
To: Rob <nospam@users.sourceforge.net>
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cc: freebsd-questions@freebsd.org
Subject: Re: Interpreting ping response? (the POD lives??)
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On Wed, Apr 14, 2004 at 12:08:16AM +0900, Rob wrote:
> 
> Kevin D. Kinsey, DaleCo, S.P. wrote:
> >can you tell me what might be happening?
> >
> ><kdk@eli> [/home/kdk] [16:25]
> >#sudo ping -s 2048 app
> >PING app.southuni.com (192.168.0.80): 2048 data bytes
> >36 bytes from app.southuni.com (192.168.0.80): Destination Host Unreachable
> 
> This may indicate that the computer is behind a firewall, that blocks 
> response
> to ping.
> 

If so, it wouldn't indicate the response is being blocked, but the
request.  If the response was being block the icmp message would
go to app.southuni.com, which originated the blocked packet.


> Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst  
>  4  5  00 05dc 07bd   0 0000  3f  01 1677 192.168.0.2  192.168.0.80

is the ip header of the packet to which the icmp-unreachable message
is a response to. (ie your original ping request)


-- 
greetz Joost
joost@jodocus.org