From owner-freebsd-current Mon Mar 6 17:23:42 2000 Delivered-To: freebsd-current@freebsd.org Received: from fgwmail6.fujitsu.co.jp (fgwmail6.fujitsu.co.jp [192.51.44.36]) by hub.freebsd.org (Postfix) with ESMTP id CABB437BCAE for ; Mon, 6 Mar 2000 17:23:38 -0800 (PST) (envelope-from shin@nd.net.fujitsu.co.jp) Received: from m1.gw.fujitsu.co.jp by fgwmail6.fujitsu.co.jp (8.9.3/3.7W-MX0002-Fujitsu Gateway) id KAA16336; Tue, 7 Mar 2000 10:22:47 +0900 (JST) (envelope-from shin@nd.net.fujitsu.co.jp) Received: from incapgw.fujitsu.co.jp by m1.gw.fujitsu.co.jp (8.9.3/3.7W-0002-Fujitsu Domain Master) id KAA15765; Tue, 7 Mar 2000 10:22:47 +0900 (JST) Received: from localhost ([192.168.245.223]) by incapgw.fujitsu.co.jp (8.9.3/3.7W-0002) id KAA26553; Tue, 7 Mar 2000 10:22:45 +0900 (JST) To: bmah@CA.Sandia.GOV Cc: jhay@mikom.csir.co.za, freebsd-current@FreeBSD.ORG Subject: Re: ipv6 and rc.conf questions In-Reply-To: <200003061550.e26FoLS20060@nimitz.ca.sandia.gov> References: <200003061037.MAA00366@zibbi.mikom.csir.co.za> <20000306201859K.shin@nd.net.fujitsu.co.jp> <200003061550.e26FoLS20060@nimitz.ca.sandia.gov> X-Mailer: Mew version 1.94 on Emacs 20.4 / Mule 4.0 (HANANOEN) X-Prom-Mew: Prom-Mew 1.93.4 (procmail reader for Mew) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20000307102338G.shin@nd.net.fujitsu.co.jp> Date: Tue, 07 Mar 2000 10:23:38 +0900 From: Yoshinobu Inoue X-Dispatcher: imput version 990905(IM130) Lines: 53 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hi, > > Wmmm, should rtadvd always be invoked when 'ipv6_gateway_enable="YES" ? > > Hmmm...two things come to mind. 1) What happens if there are two > routers running rtadvd on a single subnet? 2) Are there environments in > which a netadmin might not want to use router advertisements? (1): It is OK. Host randomly choose one of routers as its default router, and other routers are also kept as backup default routers. Host always send its packet to the default router, and if it is not correct router for the destination, then the packet is just redirected to the correct router. (2): Yes there is. Usually it is desirable that only upstream router invoke rtadvd to suppress too many redirects. In following case, only R-backbone should invoke rtadvd. (But there will be no serious problem even if R-local also invoke rtadvd.) backbone | R-backbone | --------------- my subnet | R-local | -------------- just one or two subnets But if you have more than 2 upstream routers, it might be desirable that either upstream router invoke rtadvd as redundancy. --------- backbone---- | | R-backbone1 R-backbone2 | | ---------------------------------- my subnet Yoshinobu Inoue > I have this fuzzy feeling that always invoking rtadvd on routers might > not be a good idea, but that perhaps making it the default might be good > (right now, rtadvd is turned off by default). > > Bruce. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message