[dhcwg] <draft-ietf-dhc-agent-subnet-selection-03.txt> - Classfull ?
Van Aken Dirk <VanAkenD@thmulti.com> Tue, 08 October 2002 20:59 UTC
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From: Van Aken Dirk <VanAkenD@thmulti.com>
To: "'dhcwg@ietf.org'" <dhcwg@ietf.org>
Cc: Dedecker Hans <DedeckerH@thmulti.com>, Dekeyser Miek <DekeyserM@thmulti.com>
Date: Mon, 07 Oct 2002 10:14:18 +0200
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Subject: [dhcwg] <draft-ietf-dhc-agent-subnet-selection-03.txt> - Classfull ?
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Hello Working group, Could it be that the "Link Selection sub-option for the Relay Agent Information Option" is a classfull option ? i.e. According this draft, the format of the sub-option is: >>>> SubOpt Len subnet IP address +------+------+------+------+------+------+ | TBD | 4 | a1 | a2 | a3 | a4 | +------+------+------+------+------+------+ The sub-option contains a single IP address that is an address con- tained in a subnet. The value for the subnet address is determined by taking any IP address on the subnet and ANDing that address with the subnet mask (i.e.: the network and subnet bits are left alone and the remaining (address) bits are set to zero). >>>> If I understand the above text correctly, a single (masked) IP address is added to this sub-option by the relay agent and submitted to the DHCP server. The latter will subsequently supply an address within the same subnet. I wonder though how the DHCP server can derive a subnet from a single quantity being an IP address. e.g. 20.0.0.0 can be an alias for 20.0.0.0/8 or 20.0.0.0/29. So my guess is that the only way the DHCP server can derive the subnet form is based on the leading bits of the address being either class A, B or C. Am I correct ? Thanks in advance - Dirk Dirk Van Aken THOMSON multimedia Broadband Belgium NV System Architect Prins Boudewijnlaan 47, Tel. : 03/443.65.08 2650 Edegem Fax.: 03/443.66.32 Belgium vanakend@thmulti.com _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] <draft-ietf-dhc-agent-subnet-selection-03… Van Aken Dirk
- Re: [dhcwg] <draft-ietf-dhc-agent-subnet-selectio… Ted Lemon