Hi, On Fri, May 17, 2019 at 01:45:56PM -0700, Kurt Buff - GSEC, GCIH wrote: > Forgive the intrusion, as I seek a bit of clarity. > > MSFT DirectAccess seems to use the address range in question: > > Tunnel adapter iphttpsinterface: > > Connection-specific DNS Suffix . : > IPv6 Address. . . . . . . . . . . : 2002:4332:aaaa:bbbb:cccc:dddd:eeee:ffff > Temporary IPv6 Address. . . . . . : 2002:4332:aaaa:bbbb:cccc:dddd:eeee:ffff > Temporary IPv6 Address. . . . . . : 2002:4332:aaaa:bbbb:cccc:dddd:eeee:ffff > Link-local IPv6 Address . . . . . : fe80::75e4:c4b3:fae6:237c%2 > Default Gateway . . . . . . . . . : > > It seems to me that filtering this range might hurt a bit, unless I'm > mistaking what some are proposing.
not being an MS DirectAccess expert I'd say that - given DA is a VPN technology, using IP-HTTPS as a (somewhat proprietary) tunnel tech - these addresses shouldn't be visible too much "in the [public] IPv6 Internet" so the proposed filtering (of this thread) shouldn't come into play. cheers Enno > > Kurt > > On Fri, May 17, 2019 at 1:06 PM Brian E Carpenter > <[email protected]> wrote: > > > > On 18-May-19 06:12, Gert Doering wrote: > > > Hi, > > > > > > On Fri, May 17, 2019 at 12:55:33PM -0500, David Farmer wrote: > > >> A few questions; > > >> > > >> Are you generating ICMPv6 toward non-2002::/16 sources for traffic > > >> destined > > >> to 2002::/16? > > >> Are you generating ICMPv6 toward 2002::/16 source for traffic destined to > > >> non-2002::/16? > > >> For the later, where are you getting the route for 2002::/16 from? > > > > > > Indeed, as you said, filtering correctly (= ICMP unreachable, so clients > > > can fail over quickly [if HE is not in use]) is hard. > > > > > > We still run our own relay, so do not filter today. Mostly because I > > > know it works and (since it's our relay) I can rely on it to not break > > > things for people - and haven't had time to change that to "filter". > > > > And surely the question is "What would produce the most help desk calls?". > > Filtering something that is presumably working for its remaining users > > might not be a good idea from that point of view. > > > > Brian -- Enno Rey ERNW GmbH - Carl-Bosch-Str. 4 - 69115 Heidelberg - www.ernw.de Tel. +49 6221 480390 - Fax 6221 419008 - Cell +49 173 6745902 Handelsregister Mannheim: HRB 337135 Geschaeftsfuehrer: Florian Grunow, Enno Rey ======================================================= Blog: www.insinuator.net || Conference: www.troopers.de Twitter: @Enno_Insinuator =======================================================
