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Date:      Thu, 07 Dec 2000 15:54:57 +0900
From:      Kenjiro Cho <kjc@csl.sony.co.jp>
To:        agoodloe@gradient.cis.upenn.edu
Cc:        freebsd-hackers@FreeBSD.org
Subject:   Re: Router Alert
Message-ID:  <20001207155457V.kjc@csl.sony.co.jp>
In-Reply-To: <Pine.SOL.4.21.0012062352460.24990-100000@gradient.cis.upenn.edu>
References:  <Pine.SOL.4.21.0012062352460.24990-100000@gradient.cis.upenn.edu>

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Alwyn Goodloe wrote:
>   I need to use Router Alert (rfc2113)
> (http://www.phys-iasi.ro/Library/RFCs/rfc2113.htm)
> 
> * Is there any documentation for using Router Alert in the FreeBSD
>   environement.
> * Are there specific options that the Kernel must be compiled with?
> * I know in Linux there is a IP_ROUTER_ALERT option that can be applied by
> Root users to IP sockets to intercept all forwarded packets with  the
> Router Alert option. Does it work similarly for FreeBSD.

Router alert is supported only in IPv6.
Take a look at usr.sbin/{pim6sd,pim6dd} for how to use it.

The advanced socket API for IPv6 router alert option is defined in
http://www.ietf.org/internet-drafts/draft-ietf-ipngwg-rfc2292bis-02.txt
There's no standard API for IPv4, though.

-Kenjiro


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