>From: [email protected] [mailto:[email protected]] On Behalf Of >Fred Baker (fred) >Sent: Saturday, June 22, 2013 3:49 AM >To: Ronald Bonica >Cc: [email protected] 6man-wg >Subject: Re: New Version Notification for >draft-bonica-6man-frag-deprecate-00.txt > >I suppose I'm the contrarian
+1. For me, this draft looks dangerous by proposing to deprecate fragmentation with only one-side observation. This draft does not give enough analysis on these existing fragmentation use cases, particularly these use cases the fragments within a single domain. On other side , only disallowing fragmentation to be used among domains may helpful to reduce the operational complex. Best regards, Sheng >but this draft gives me some heartburn >surrounding the robustness principle. Yes, TCP MSS generally limits the use of >fragmentation for IPv6. We don't have a counterpart to MSS for UDP, and >others have noted that OSPF etc may have issues. > >Thinking hypothetically, it would be unusual for OSPF to not be able to >manage packet size via LSA choice, but suppose I am on an interface that has >a given MTU, and I have a single LSA that is larger than that MTU, perhaps a >Router LSA on a wide fan-out unit. Deprecating the fragmentation capability >forces each client of the network layer to create a means for >fragmentation/segmentation. That might be some other protocol that >essentially duplicates what we're deprecating, or it could be something in >which a router has to make enough routing instances of itself to split the >Router LSA across them, or something like that. > >Personally, I think I would prefer a statement that says that the first >fragment >MUST contain the transport header (which Fernando has been pushing), and >encourages transports and applications to implement some variation on >PMTU rather than depending on fragmentation, but not deprecating the >capability. >-------------------------------------------------------------------- >IETF IPv6 working group mailing list >[email protected] >Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >-------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
