NSSA summarization
Ajay Thakur <tajay@NETD.COM> Tue, 16 August 2005 04:49 UTC
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Date: Tue, 16 Aug 2005 10:12:50 +0530
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From: Ajay Thakur <tajay@NETD.COM>
Subject: NSSA summarization
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Hi all, I have some more queries in OSPF - NSSA area. Suppose I am summarizing type-7 LSAs. In this case while generating type-5 lsa we follow section 4.1 of rfc 1587, e.g. 1> If none of the LSA's LS-Id matches to my summary-address range but LS-Id falls under configured summary address range, then we generate type-5 as per rfc 1587 -section 4.1 (2) and 2> If my LSA has LS-Id equal to summary address range then we generate type-5 lsa as per rfc 1587 section-4.1(1) Now my question is , What happens if ospf database has one LSA with LS-Id matches to my summary-address range and some LSAs with LS-Id falling under summary-address range. Then in this case what type of metric or path-type we should set in the type-5 lsa? Need your help, Thanks, with regards ajay Vishwas Manral wrote: >Hi Acee, > > > >>Acee: In practice, for OSPFv2 the sequence numbers are not monotically >>increasing; Usage of router's clock for cryptographic sequence number >>generation reduces the chance for replay attacks across restarts. >>?: OSPF spec does not say it ... >> >> >Acee, what I meant was that although the OSPF spec does not state that >we need to use clocks. > >I think the vulnerabilities draft is the right place to state the >problems that can happen if we do not use a clock (or something >equivalent which increments even when a system goes down). > >Another issue is that even if the sender uses clock for the "sequence >number" and goes down, all the packets of a previous session can still >be replayed by another router. So the chance of replay attacks is still >there. > >Thanks, >Vishwas >-----Original Message----- >From: Mailing List [mailto:OSPF@PEACH.EASE.LSOFT.COM] On Behalf Of Acee >Lindem >Sent: Monday, August 15, 2005 7:50 PM >To: OSPF@PEACH.EASE.LSOFT.COM >Subject: OSPF WG Minutes > >Attached are the minutes from the Paris OSPF WG meeting. Thanks to >Dimitri for taking them. > >Acee > > >
- OSPF WG Minutes Acee Lindem
- Re: OSPF WG Minutes Vishwas Manral
- NSSA summarization Ajay Thakur
- Re: NSSA summarization sujay
- Re: OSPF WG Minutes Acee Lindem
- Re: OSPF WG Minutes Vishwas Manral
- Re: OSPF WG Minutes ashok
- Re: OSPF WG Minutes Paul Jakma
- [OSPF] OSPF WG Minutes Acee Lindem
- Re: [OSPF] OSPF WG Minutes Vishwas Manral
- Re: [OSPF] OSPF WG Minutes Acee Lindem
- [OSPF] OSPF WG Minutes Acee Lindem
- Re: [OSPF] OSPF WG Minutes Acee Lindem (acee)
- [OSPF] OSPF WG Minutes Acee Lindem (acee)
- Re: [OSPF] OSPF WG Minutes Shraddha Hegde