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RE: Link MTU restriction in 2461


 > -----Original Message-----
 > From: Erik Nordmark [mailto:erik.nordmark@xxxxxxx]
 > Sent: Monday, October 25, 2004 2:15 AM
 > To: Soliman, Hesham
 > Cc: ipv6@xxxxxxxx; narten@xxxxxxxxxx
 > Subject: Re: Link MTU restriction in 2461
 > Soliman, Hesham wrote:
 > > Hi, 
 > > 
 > > The following comment was received from Elwyn Davies:
 > > 
 > > 	S6.3.4: (next to last para on p49):  The restriction in 
 > setting the LinkMTU to be not 	greater than the 
 > default value specified in the link type specific document 
 > is odd and 	actually inconsistent with the statements in 
 > RFC2590 for example (which allows LinkMTUs 	both larger and 
 > smaller than the default). 
 > > 
 > > I'm not sure about the history of this so I wanted to get some 
 > > feedback from the authors or other members if possible. It is 
 > > true that RFC 2590 allows for MTUs to be larger or smaller
 > > than the default, provided that they're above 1280. 
 > I think this is an error in RFC 2461. To correct it there is 
 > perhaps a 
 > need to make the destinction between the default MTU and the upper 
 > limit. In the case of Ethernet (ignoring jumboframes) both 
 > values are 
 > the same which is why the wording is off.
 > So if the IP-over-foo specification has a hard upper limit, then MTU 
 > options larger than this should be ignored. But is it ok for the MTU 
 > option to be larger than the default MTU.
 >     Erik

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