From owner-FreeBSD-tech-jp@jp.freebsd.org  Wed May 13 16:35:43 1998
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Date: Wed, 13 May 1998 16:35:37 +0900 (JST)
Message-Id: <199805130735.QAA02839@bd.mbn.or.jp>
Posted-Date: Tue, 12 May 1998 19:01:43 JST
To: FreeBSD-tech-jp@jp.freebsd.org
In-Reply-To: Your message of "Fri, 08 May 1998 11:23:32 +0900".
	<199805080223.LAA00608@moon.trad.pfu.co.jp>
From: chi@bd.mbn.or.jp (Chiharu Shibata)
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Subject: [FreeBSD-tech-jp 1434] Re: iij-ppp mru 
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$B$3$s$K$A$O!"<FED$G$9!#(B
<19980508103737M.matusita@ics.es.osaka-u.ac.jp>$B$N5-;v$K$*$$$F(B
matusita@ics.es.osaka-u.ac.jp$B$5$s$O=q$-$^$7$?!#(B

>$B$9$G$K$4$i$s$K$J$C$F$i$C$7$c$k$H$O;W$&$N$G$9$,!$8=:_$N(B 2.2-STABLE $B$G$O(B
>$B3:EvItJ,$OB?J,$3$&$J$C$F$$$k$h$&$G$9!%(B3.0-CURRENT $B$K$*$1$k3:EvItJ,$K$b(B
>$BF1MM$N=hM}$,=q$$$F$"$k$h$&$K8+$($^$9!%(B

<199805080223.LAA00608@moon.trad.pfu.co.jp>$B$N5-;v$K$*$$$F(B
takayuki@moon.trad.pfu.co.jp$B$5$s$O=q$-$^$7$?!#(B

>$B$5$i$K$$$($P!$(BMRU$B$r(B1500$BL$K~$K$9$k$N$b$[$H$s$I0UL#$,$"$j$^$;$s!%$?$H$((B
>1500$BL$K~$N(BMRU$B$G(Bnegotiation$B$,40N;$7$?$H$7$F$b!$(B1500byte$B$^$G$N%Q%1%C%H$O(B
>$B<u$1$i$l$J$1$l$P$J$i$J$$$H$$$&$3$H$K$J$C$F$$$^$9!%(B(see RFC1661 6.1.)

$B;XE&$N(BCurrent$B%=!<%9$*$h$S(BRFC1661$B$r%A%'%C%/$7$?$H$3$m!"3N$+$K(B1500$B%P%$%H(B
$B$N<u?.$,(B"MUST"$B$K$J$C$F$$$^$9$M!#(B
----man ppp----
    set mru value
       The default MRU is 1500.  If it is increased, the other side *may*
       increase its mtu.  There is no use decreasing the MRU to below the
       default as the PPP protocol *must* be able to accept packets of at
       least 1500 octets.
----RFC1661----
      The default value is 1500 octets.  If smaller packets are
      requested, an implementation MUST still be able to receive the
      full 1500 octet information field in case link synchronization is
      lost.

>$B>e5-$NM}M3$+$i(BMRU$B$,(B1500$BL$K~$K$7$F$b0UL#$r$J$5$J$$$?$a!$(B1500$BL$K~$N(BMRU$B$O(B
>$B$^$C$?$/%5%]!<%H$NI,MW$O$J$$$N$G$O$J$$$+$J$H9M$($F$^$9!%(B1500$BL$K~$N(BMRU
>$B$,MW5a$5$l$?>l9g$O!$$=$N(Boption$B$r(BReject$B$7$F$7$^$&(B(MRU$B%*%W%7%g%s$r6X;_$9(B
>$B$k(B = MRU$B$O(Bdefault$B$N(B1500$B$H$J$k(B)$B$G==J,$G$O$J$$$+$H!%!%!%(B

$B$b$H$b$H!"$J$<(BMRU$BCM$r>.$5$/$7$h$&$+$H;W$C$?$+$H$$$&$H!"(BPadding$B$NLdBj(B
$B$+$i$G$9!#(B
PPP$B$G$O%G!<%?D9$,%M%4%7%(!<%7%g%s$G7hDj$7$?(BMRU$BCM$KK~$?$J$$>l9g!";D$j(B
$B$NItJ,$r(BPadding$B$7$F$b$h$$(B("MAY")$B$3$H$K$J$C$F$$$^$9!#(B
$B!t$3$l$O(BRFC1661$B$N(B2. PPP Encapsulation$B$K$"$j$^$9(B

iij-ppp$B$O$I$&$d$i(BPadding$B$O$7$F$$$J$$$h$&$G$9$,!"Aj<jB&$N<BAu$,(BPadding
$B$"$j$@$C$?>l9g$O!"FC$KBPOCE*=hM}$N>l9g!"(BMRU$BCM(B1500$B$G$O!"$+$J$j$N%`%@$J(B
$B%G!<%?$,N.$l$k$3$H$K$J$j$^$9!#(B

$B%"%J%m%02s@~$N8B$i$l$?BS0h$rM-8zMxMQ$7$?$/$F!"(BPadding$B$r8B$j$J$/>/$J$/(B
$B$7$?$$"*(BMRU$BCM$r>.$5$/$7$?$$$H$$$&$3$H$@$C$?$N$G$9$,!"$I$&$d$i%W%m%H%3%k(B
$BE*$K$O<YF;$N$h$&$G$9$M!#$I$&$b$*A{$,$;$7$^$7$?!#(B

PS.
$B$I$&$G$b$$$$$1$I!"2?$G<+J,$,2CF~$7$F$$$k(BISP$B$N(BPPP$B%5!<%P$O(B"1524"$B$J$s$F(B
$B$$$&CM$rMW5a$7$F$/$k$s$@$m$&!)(B
-- 
$B<FED(B $B@i=U(B($B!i(B) chi@bd.mbn.or.jp <http://plaza17.mbn.or.jp/~chi/>
	C-NET$B%7%j!<%:$K$D$$$F$N%Z!<%8(B
	<http://plaza17.mbn.or.jp/~chi/myprog/FreeBSD/cnet.html>
