Although intf's won't combine packets, I usually set higher MTU's so that larger packets with the DF flag on will be allowed through.
Brent On 29/11/01 21:16 -0500, Priscilla Oppenheimer wrote: : [...] A lot of novices think that having a large interface :MTU is going to make a big difference, but I'm not convinced. The interface :isn't going to combine packets it receives into larger packets just because :of the larger MTU. Packets can't grow!? [...] : :I'll have to look into this. Thoughts? Comments? : :Priscilla : :At 05:26 PM 11/29/01, Howard C. Berkowitz wrote: :> >Found this in RFC 1661 which documents PPP: :> > :> >The maximum length for the Information field, including Padding, but not :> >including the Protocol field, is termed the Maximum Receive Unit (MRU), :> >which defaults to 1500 octets. By negotiation, consenting PPP :> >implementations may use other values for the MRU. :> > :> >P. :> :>Hmmm...I definitely am aware of providers using 4470 on POS links, :>and a general trend in the gigabit-plus world to use larger MTUs. Is :>this simply industry practice, I wonder, or are there some overriding :>IEEE or IETF documents? Perhaps in the sub-IP area, such as IP over :>Optical? :> :> > :> >At 03:05 PM 11/29/01, Howard C. Berkowitz wrote: :> >> >Howard, :> >> > :> >> >Correct me if am wrong but, the HDLC advantage over PPP is the MTU :size. :> >> >PPP supports 1500 while HDLC 4xxx (can't remember the exact number), :> >> >this might be helpful in situations where DF bit is set. :> >> > :> >> >Nabil :> >> :> >>I'd have to research this -- I don't offhand remember PPP (as the :> >>protocol) having a MTU limit that small. It would surprise me, given :> >>the interest in POS. :> >________________________ :> > :> >Priscilla Oppenheimer :> >http://www.priscilla.com :________________________ : :Priscilla Oppenheimer :http://www.priscilla.com : : : : Brent Wrisley -------------------- 2FB6 85AD 7084 80A0 8381 C116 CDE5 78B5 E959 C536 PGP Key ID: 0xE959C536 (us.pgp.net) Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=27828&t=27637 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
