[dhcwg] dhcpv6-24: Interface-ID option
Thomas Narten <narten@us.ibm.com> Wed, 08 May 2002 15:11 UTC
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To: dhcwg@ietf.org
Date: Wed, 08 May 2002 11:09:48 -0400
From: Thomas Narten <narten@us.ibm.com>
Subject: [dhcwg] dhcpv6-24: Interface-ID option
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> If the relay agent cannot use the address in the link-address field > to identify the interface through which the response to the client > will be forwarded, the relay agent MUST include an Interface-id > option (see section 22.19) in the Relay-forward message. The server I think the interface-id option may be underspecified. If it is included, but there is no valid link-address (which I understand is the reason for defining this particular option), how does the server know which addresses to assign the client? I.e., how does the server know on which link the client is? > The relay agent puts the client's address in the link-address field > regardless of whether the relay agent includes an Interface-id option > in the Relay-forward message. This doesn't seem right to me. I thought that the link-address is supposed to hold the address of the relay agent. Seems wrong to put the client's address in it. The link-address field is what the server uses to figure out which link the client is on (right?). Also, since the client's address is a link-local address, this field doesn't seem to contain useful information for the server in this case. > Servers MAY use the Interface-ID for parameter assignment policies. > The Interface-ID SHOULD be considered an opaque value, with policies > based on exact string match only; that is, the Interface-ID SHOULD > NOT be internally parsed by the server. Shouldn't the first MAY be a MUST? I.e., the link-address field contains no useful information. Also, not sure the above is sufficient. Unless the interface-identifier is somehow stable, it's not clear how the server policy could take it into account. There are no words suggesting the interface-identifier needs to be stable. > interface-id An opaque value of arbitrary length generated > by the relay agent to identify one of the > relay agent's interfaces Any reaosn not to make this 32 bits? the IPv6 API already has 32-bit interface IDs. Is there any reason to make it larger? Thomas _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] dhcpv6-24: Interface-ID option Thomas Narten
- RE: [dhcwg] dhcpv6-24: Interface-ID option Bernie Volz (EUD)
- Re: [dhcwg] dhcpv6-24: Interface-ID option Ralph Droms
- RE: [dhcwg] dhcpv6-24: Interface-ID option Bound, Jim
- RE: [dhcwg] dhcpv6-24: Interface-ID option Bound, Jim
- RE: [dhcwg] dhcpv6-24: Interface-ID option Bernie Volz (EUD)
- [dhcwg] dhcpv6-24: Interface-ID option Ralph Droms