Date: Tue, 07 Mar 2000 10:23:38 +0900 From: Yoshinobu Inoue <shin@nd.net.fujitsu.co.jp> To: bmah@CA.Sandia.GOV Cc: jhay@mikom.csir.co.za, freebsd-current@FreeBSD.ORG Subject: Re: ipv6 and rc.conf questions Message-ID: <20000307102338G.shin@nd.net.fujitsu.co.jp> 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>
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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.
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