Re: [Softwires] More changes to revision 03.
Leaf yeh <leaf.y.yeh@huawei.com> Mon, 30 January 2012 11:41 UTC
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Date: Mon, 30 Jan 2012 11:38:26 +0000
From: Leaf yeh <leaf.y.yeh@huawei.com>
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To: Ole Trøan <ot@cisco.com>
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Cc: softwires WG <softwires@ietf.org>, "map-dt@external.cisco.com team" <map-dt@external.cisco.com>, "fine_sz@huawei.com" <fine_sz@huawei.com>
Subject: Re: [Softwires] More changes to revision 03.
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Ole - what's the difference? I suggested the following text for the readable . Given: End-user IPv6 prefix: 2001:db8:0012:34::/56 Basic Mapping Rule: {2001:db8:00::/40 (Rule IPv6 prefix), 192.0.2.0/24 (Rule IPv4 prefix), 16 (Rule EA-bits length)} PSID offset: 4 (default value as per section 5.1.3) We get the IPv4 address, its sharing ratio and port-set: EA bits offset: 40 IPv4 suffix bits (p): Length of IPv4 address (32) - IPv4 prefix length (24) = 8 IPv4 address: 192.0.2.18 (0x12) Sharing ratio: 256 (16 - (32 - 24) = 8. 2^8 = 256) Cheers, Leaf -----Original Message----- From: Ole Trøan [mailto:ot@cisco.com] Sent: Monday, January 30, 2012 6:16 PM To: Leaf yeh Cc: fine_sz@huawei.com; map-dt@external.cisco.com team Subject: Re: More changes to revision 03. Leaf, > Again C&Qs on the examples in the newly updated candidate of MAP-03: > > A. Section 5.2 - Given: > End-user IPv6 prefix: 2001:db8:0012:34::/56 > Basic Mapping Rule: {2001:db8:00::/40 (Rule IPv6 prefix), > 192.0.2.0/24 (Rule IPv4 prefix), > 16 (Rule EA-bits length)} > Sharing ratio: 256 (16 - (32 - 24) = 8. 2^8 = 256) > PSID offset: 4 > > We get IPv4 address and port-set: > EA bits offset: 40 > IPv4 suffix bits (p): Length of IPv4 address (32) - > IPv4 prefix length (24) = 8 > …. > > C1. The ‘End-user IPv6 prefix’ shall be express as ‘2001:db8:0012:3400::/56’ as per the section 2.3 of RFC4291; fixed. > C2. The sharing ratio sounds a calculated result, not a ‘given’ condition; what's the difference? > > B. Section 5.3 - Given: > IPv4 destination address: 192.0.2.18 > IPv4 destination port: 9030 > Forwarding Mapping Rule: {2001:db8:00::/40 (Rule IPv6 prefix), > 192.0.2.0/24 (Rule IPv4 prefix), > 16 (Rule EA-bits length)} > > We get IPv6 address: > IPv4 suffix bits (p): 32 - 24 = 8 (18 (0x12)) > PSID length: 8 > PSID: 0x34 (9030 (0x2346)) > EA bits: 0x1234 > MAP IPv6 address: 2001:db8:0012:3400:00c0:0002:1200:3400 > > C3. I suppose the default ‘PSID offset: 4’ seems need to express in the ‘given’ conditions; OK > Q1. Have the draft stated the ‘u’ bits in the Interface-ID should be 0x00? it states that it is based on 6052. I think that should be sufficient. cheers, Ole
- Re: [Softwires] More changes to revision 03. Ole Trøan
- Re: [Softwires] More changes to revision 03. Leaf yeh
- Re: [Softwires] More changes to revision 03. Rajiv Asati (rajiva)
- Re: [Softwires] More changes to revision 03. - Se… Leaf yeh
- Re: [Softwires] More changes to revision 03. - Se… Ole Trøan