Date: Thu, 20 Jan 2005 11:10:32 GMT From: Hajimu UMEMOTO <ume@freebsd.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/75121: Wrong behaviour of IFF_LINK2 bit in 6in6 gifs? Message-ID: <200501201110.j0KBAWox099517@freefall.freebsd.org>
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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/
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