At 10:51 PM 10/5/2011, bloger wrote: >÷ ÏÔ×ÅÔ ÎÁ ÓÏÏÂÝÅÎÉÅ ÔÏ×ÁÒÉÝÁ Michael B. >Brutman, ÄÁÔÉÒÏ×ÁÎÎÏÅ 5-Oct-2011 19:39: > On >10/5/2011 7:27 PM, Alain Mouette wrote: > > I >had problems with networking in dos for a few >users, a short time > > ago. After a lot of >headache, I discovered that those were > > >conections via ADSL that used PPPoE, which has a >28 bytes overhead. > > > > So now I use >MTU=1472 > > Ah, interesting! I should put that >tip in the user notes. I set a > default of 576, >which is the minimum that a gateway must Some >FAQs advice MTU/MRU 1492. For example >http://adju.st/paper/openbsd-adsl-wlan-howto.html > -- bloger -------------------------------------------
The MTU in case of PPPo"E" (E=Ethernet)is indeed 1492 bytes, as there are 6 bytes PPPoE header and 2 bytes protocol ID as per RFC2516. Lower MTUs are usually found in DSL implementations which are in fact PPPo"A", as they need to be a multiple of the ATM frames, but then the max. MTU should rather be 1478 bytes (31 frames of 48 bytes, 2 bytes protocol ID and 8 bytes AAL5 header)... Ralf ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
