Date: Mon, 19 Jul 2021 12:40:35 -0700 From: Mel Pilgrim <list_freebsd@bluerosetech.com> To: freebsd-questions@freebsd.org Subject: Re: Specifying IPv6 off-link for a subnet Message-ID: <010afd33-d7e5-b8b5-229e-823aa007a045@bluerosetech.com> In-Reply-To: <YPTCSCcndUWY4409@thismonkey.com> References: <YOMpKMgvV2zs4ZVj@thismonkey.com> <5ea688b3-79b9-8a28-0430-5a4651207ae0@bluerosetech.com> <YPTCSCcndUWY4409@thismonkey.com>
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On 2021-07-18 17:07, Scott wrote: > On Wed, Jul 07, 2021 at 07:43:48PM -0700, Mel Pilgrim wrote: >> On 2021-07-05 8:45, Scott wrote: >>> I have manually configured IPv6 on the interfaces: >>> ifconfig_vmx0_ipv6="inet6 xx::yy prefer_source accept_rtadv -autoconf no_radr" [...] >>> Here's the received RA: [...] >>> prefix info option (3), length 32 (4): xx::/64, Flags [none], valid >>> time 3600s, pref. time 60s >>> >>> Note that there is no L flag set, so the prefix is off-link. >> >> If set, the L flag indicates the prefix can be used for on-link >> determination. But if the L bit is unset, the PIO isn't making any >> assertion about the prefix being on-link or off-link. More importantly, >> a host must not use a PIO with L=0 to conclude a prefix is off-link. >> >> IOW, it is correct for a host to do nothing when it receives an RA PIO >> with no flags for an already-configured prefix. > > so for the case of manually addressed devices on a private vLAN/IPPL there > must be a way to specify that the configured prefix is not on-Link. Yes, by not configuring that prefix. Numbering vmx0 into xx::/64 made xx::/64 on-link by definition. This seems like too intuitive of an answer, though. Can you step back and explain what you need to do at a higher level?
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