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From: "soheil h" <soheil_h_y@hotmail.com>
To: tlambert2@mindspring.com, freebsd-net@FreeBSD.ORG,
	freebsd-questions@FreeBSD.ORG
Subject: Re: UNKNOWN IP OPTION emergency
Date: Fri, 27 Sep 2002 07:27:54 +0330
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Hi
but the tunnel_send() for multicast tunnel do this with LSRR option
is the tunnel_send() a standard tunnel ?????? that anyone understand it ? or 
not ??? Thanx



>From: Terry Lambert <tlambert2@mindspring.com>
>To: soheil h <soheil_h_y@hotmail.com>
>CC: freebsd-net@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG
>Subject: Re: UNKNOWN IP OPTION emergency
>Date: Thu, 26 Sep 2002 10:07:41 -0700
>
>soheil h wrote:
> > as in stevens' Tcp/Ip illustrated says when a router see an unknown 
>option
> > it must silently ignore it but when i put an option by type 253 len 12 
>and
> > 10 byte of data
> > some router on my path drop it
> > how can i set an option an put 2 ip address in it  that no router delete 
>my
> > data
>
>Send a known option, instead?
>
>Ignore := pass | drop
>
>Normally, it means "drop", because unknown options are assumed to
>be hop-to-hop, meaning it's illegal for them to come from a router
>that did not originate them (i.e. a router that doesn't recognize
>the option forwarding it to one that does).
>
>If you want a covert data channel, you aren't going to be able to
>do it with router options.  8-).
>
>-- Terry




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