I thought Path MTU discovery was used to set the MSS in the TCP stack. I just wasn't sure if it worked the same way for UDP.
- Larry From: Anoop Ghanwani <[email protected]<mailto:[email protected]>> Date: Friday, April 10, 2015 12:10 PM To: Larry Kreeger <[email protected]<mailto:[email protected]>> Cc: Lizhong Jin <[email protected]<mailto:[email protected]>>, Lucy yong <[email protected]<mailto:[email protected]>>, Erik Nordmark <[email protected]<mailto:[email protected]>>, "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: [nvo3] Encapsulation considerations Even for TCP it depends on what the MSS is. Anoop On Fri, Apr 10, 2015 at 11:55 AM, Larry Kreeger (kreeger) <[email protected]<mailto:[email protected]>> wrote: On 4/9/15 7:22 PM, "Lizhong Jin" <[email protected]<mailto:[email protected]>> wrote: >>-----Original Message----- >>From: Lucy yong [mailto:[email protected]<mailto:[email protected]>] >>Sent: 2015年4月9日 22:28 >>To: Lizhong Jin; 'Erik Nordmark'; [email protected]<mailto:[email protected]> >>Subject: RE: [nvo3] Encapsulation considerations >>Lizhong, >>[snip] >> [Lizhong] If the NVE and tenant is integrated into one device, then >>the issue >>could be solved by implementation. Because tenant know the entropy value >>of >>the first segment, and use the same value to the subsequent segment. So >>different implementation model could provide different entropy value. Or >>do we >>need other mechanism to mitigate this issue, e.g., fragment on NVE in >>draft-herbert-gue-fragmentation. >>[Lucy] IMO: NVO3 solution SHOULD avoid packet fragmentation. >>Draft-herbert-gue-fragmentation provides an option for a GUE application >>to do >>fragmentation but does not require doing it. GUE application decides if >>the >>fragmentation is needed or not. We should not separate two. >[Lizhong] fragmentation could not be avoided, because we are unable to >prevent >the tenant from fragmentation. This is the factor which makes the hashing >based >load balancing unoptimized. I'm not very familiar with host stacks. Do they actually fragment at the IP layer, or is it done at the transport layer before adding the IP header? I'm sure TCP must break the segments up before IP would fragment, but I'm not sure about UDP. - Larry _______________________________________________ nvo3 mailing list [email protected]<mailto:[email protected]> https://www.ietf.org/mailman/listinfo/nvo3
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