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Date: Thu, 20 Jan 2005 11:10:32 GMT
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To: freebsd-bugs@FreeBSD.org
From: Hajimu UMEMOTO <ume@freebsd.org>
Subject: Re: kern/75121: Wrong behaviour of IFF_LINK2 bit in 6in6 gifs?
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The following reply was made to PR kern/75121; it has been noted by GNATS.

From: Hajimu UMEMOTO <ume@freebsd.org>
To: FreeBSD-gnats-submit@freebsd.org
Cc: Antonio Tapiador del Dujo <atapiador@dit.upm.es>,
	Gleb Smirnoff <glebius@freebsd.org>
Subject: Re: kern/75121: Wrong behaviour of IFF_LINK2 bit in 6in6 gifs?
Date: Thu, 20 Jan 2005 19:57:12 +0900

 Hi,
 
  A> > The IFF_LINK2 means that incoming tunnel packets may come from interface
  A> > different to interface we use for sending out tunnel packets.
  A> 
  A> gif(4) man page talks about ingress filtering:
  A> "Ingress filtering can be turned off by IFF_LINK2 bit."
  A> that has to do with source addresses (RFC 2893, section 4.3)
  A> Then maybe this is a gif(4) man page bug. 
  
 glebius>  Yes, it is I think. Section 4.3 speaks about other kind of filtering.
 
 No, manpage of gif(4) is correct.  Ingress filtering is for preventing
 IP address spoofing of outer src address and dest address.
 
 Sincerely,
 
 --
 Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
 ume@mahoroba.org  ume@{,jp.}FreeBSD.org
 http://www.imasy.org/~ume/