Date: Thu, 20 Oct 2011 13:06:42 -0300 From: Fernando Gont <fernando@gont.com.ar> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: IPv6 Redirects & local destinations Message-ID: <4EA04712.3060705@gont.com.ar> In-Reply-To: <F8470CE2-D5E7-46D6-AF0F-1A85AC1DB21D@lists.zabbadoz.net> References: <4E9FAFCD.3080908@gont.com.ar> <F8470CE2-D5E7-46D6-AF0F-1A85AC1DB21D@lists.zabbadoz.net>
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Hi, Bjoern, Thanks so much for your prompt response! PLease find my comments inline... On 10/20/2011 09:19 AM, Bjoern A. Zeeb wrote: >> While doing some testing, it seems that FreeBSD ignores ICMPv6 Redirects >> when both the Redirect Destination and the Redirect Target are the same >> (i.e., the destination is supposed to be on-link). >> >> OTOH, Redirects are processed as expected when the Redirect Target is >> different from the Redirect Destination. > > What does it log if you turn on the following sysctl > net.inet6.icmp6.nd6_debug=1 > and reproduce? Nothing. However, the problem seems to be this: While an entry is added in the Neighbor Cache, no host-route is added to the routing table. Hence the corresponding entry in the Neighbor Cache is never used. >> Should I report this as a bug, or is this (non-rfc-compliant) behavior >> intentional? (If so, what's the rationale?) > > It's kern/152791, isn't it? Yep, it seems it is. -- The fix would be that when an ICMPv6 Redirect is received with RD Target == RD Destination, not only is an entry created in the Neighbor Cache, but a host-route is also created in the routing table. Thanks! Best regards, -- Fernando Gont e-mail: fernando@gont.com.ar || fgont@acm.org PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1
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