Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf-dhc-access-network-identifier-10: (with DISCUSS)
"Bernie Volz (volz)" <volz@cisco.com> Mon, 14 September 2015 21:30 UTC
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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Alissa Cooper <alissa@cooperw.in>
Thread-Topic: Alissa Cooper's Discuss on draft-ietf-dhc-access-network-identifier-10: (with DISCUSS)
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Date: Mon, 14 Sep 2015 21:29:53 +0000
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Subject: Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf-dhc-access-network-identifier-10: (with DISCUSS)
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Alissa: These options are only added and processed between dhcp relay-agents and servers. No dhcp clients need changing. As the operator typically runs both the relays and servers, they should know when to configure use of these options (sub-options) based on their network needs. Also, unless there is some reason the servers needs this information, there is no need to configure use. Also, this usage makes snooping harder - it is in the SPs network behind the relay agents. - Bernie (from iPad) > On Sep 14, 2015, at 5:10 PM, Alissa Cooper <alissa@cooperw.in> wrote: > > Alissa Cooper has entered the following ballot position for > draft-ietf-dhc-access-network-identifier-10: Discuss > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-dhc-access-network-identifier/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > I have some questions about this draft. They derive from the position > that some of the values in the options specified can reveal sensitive > information about the mobile user. I would put access network name > (especially when it's SSID, since people put identifying information in > SSIDs), access point name, and BSSID in that category at a minimum. > > The draft specifies DHCP options for downstream use in PMIPv6 scenarios, > but makes no mention about actually limiting the use of these options to > those scenarios. It's not clear to me whether those limits could be > achieved in any case, since an AP won't know a priori whether it is being > deployed in a service-provider-WiFi or cellular context or not. So what > is the authors' expectation about the breadth of deployment of these > options? Every DHCP stack? Something less than that? Furthermore, are any > of the individual fields required or optional? RFC 6757 indicates that > within PMIPv6 only the ATT is required. > > Given the drawbacks discussed in Section 9, why was DHCP the protocol > chosen for this? Is there no other protocol that APs speak to MAGs that > has confidentiality, integrity protection, and authentication support? If > DHCP is the only choice, why are none of the security fixes normatively > required ("confidentiality and integrity protection should be employed," > "DHCP server administrators are strongly advised to configure DHCP > servers ... using IPsec," "administrators have to consider disabling the > capability specified")? > > Why would an LMA need the MAC address of the AP? Are there examples of > policies that mobile networks have in place that apply differently to two > devices connected to the same SSID but different APs, for example? I > looked for this in RFC 6757 too but did not see it. Given the potential > sensitivity of this field it seems like a justification for sharing it in > an eavesdroppable way needs to be provided. > > > >
- [dhcwg] Alissa Cooper's Discuss on draft-ietf-dhc… Alissa Cooper
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Bernie Volz (volz)
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Alissa Cooper
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Sri Gundavelli (sgundave)
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Sri Gundavelli (sgundave)
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Alissa Cooper
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Sri Gundavelli (sgundave)
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Alissa Cooper
- Re: [dhcwg] Alissa Cooper's Discuss on draft-ietf… Sri Gundavelli (sgundave)