Thanks for your answer! Shuki -----Original Message----- From: Templin, Fred L [mailto:[EMAIL PROTECTED] Sent: Thursday, September 14, 2006 12:00 PM To: Suresh Krishnan; sasson, shuki Cc: harris, arthur; [EMAIL PROTECTED]; viswanadha, kamakshi; ipv6@ietf.org; nathanson, daphna Subject: RE: MTU on a Link Local Address.
Don't forget though that tunnels are also links with link-local addresses and there may be arbitrary physical link technologies (with heterogeneous MTUs) on the paths between tunnel endpoints. All links are required to support a minimum MTU of 1280 bytes for IPv6, and this is no different for tunnels. But, larger MTUs can be realized if the tunnel endpoints engage in a link adaptation scheme with tunnel endpoint-based segmentation/reassembly and dynamic segment size probing; see: http://bgp.potaroo.net/ietf/idref/draft-templin-linkadapt/ Fred [EMAIL PROTECTED] -----Original Message----- From: Suresh Krishnan [mailto:[EMAIL PROTECTED] Sent: Thursday, September 14, 2006 8:02 AM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; ipv6@ietf.org; [EMAIL PROTECTED] Subject: Re: MTU on a Link Local Address. Hi Sasson, It should be 2. the MTU of the NIC device on the link (assuming it is properly configured). You can certainly use 1280 bytes as an MTU but if you link can support substantially larger MTU, it is inefficient to use 1280. Cheers Suresh [EMAIL PROTECTED] wrote: > Hi all, as we all know Link Local addresses and communicating through them > are a must in an IPv6 environment. Without it Neighbor Discovery will not > work and so address resolution. > Our system enables one to set an MTU for and IPv6 address. So it is very much > possible to set the MTU also for the Link Local IPv6 address. > The question I have for this forum is what is the MTU value that should be > set for this Link Local address? > > Possibilities: > > 1. 1280 --- the reason is that this value would guarantee a Neighbor > Discovery operation since all devices must support at least this MTU. > 2. The MTU of NIC device associated with this Link Local --- All of the > Neighbor Discovery messages (even the future ones) are guaranteed to be less > than 1280 so I shouldn't worry about it. > 3. ??? > > Thanks for your answers! > Shuki > > > Shuki Sasson > Principal Engineer, Network Storage Group > EMC² > where information lives > Fax: 508 305 9026 > Phone: 508 305 8515 > Cell: 617 834 4258 > Pager: 877 919 0794 > Email: [EMAIL PROTECTED] > > > > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
