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Date: Wed, 12 Dec 2001 01:52:41 +0900
From: TERAMOTO Masahiro <markun@onohara.to>
To: FreeBSD-net-jp@jp.FreeBSD.org
In-Reply-To: <20011205.231421.74752105.moriko@mizuki.noe.mcu.or.jp>
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Subject: [FreeBSD-net-jp 3487] Re: PPPoE =?ISO-2022-JP?B?GyRCJEcbKEI=?=
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$B;{K\$G$9!#(B

On Wed, 05 Dec 2001 23:14:21 +0900 (JST)
MORI Kouji <moriko@hh.iij4u.or.jp> wrote:

> IIJmio + Flet's ADSL $B$r(B FreeBSD 4.4R $B$r(B PPPoE + NAT $B%k!<%?$H$7$F@\B3$7$F(B
> $B$$$k$N$G$9$,!"(Bwww.netbsd.org $B$H$+$N0lIt$N%5%$%H$K%"%/%;%9$G$-$J$$$3$H$K(B
> $B5$$,$D$-$^$7$?!#(Bping $B$H$+$ODL$j$^$9!#(B

$B;d$N$H$3$m$G$bF1$8$h$&$JLdBj$,H/@8$7$F$$$^$9!#(B

Flet's ADSL + InfoSphere BizADSL8 $B$G!"(BPPPoE $B%k!<%?$O(B FreeBSD
4.4-RELEASE $B$G$9!#%k!<%?$G$O(B ipfw $B$G%U%#%k%?%j%s%0$r$7$F$$$^(B
$B$9$,!"(B

allow ip from any to any frag
allow icmp from any to any

$B$N%k!<%k$G(B ICMP $B$H(B fragment $B$5$l$?(B IP datagram $B$O$9$Y$F5v2D(B
$B$7$F$$$^$9!#(B

$B$3$N>uBV$G!"(BInternet $B$+$iG[2<$N(B NetBSD $B%^%7%s$K(B POP $B$G@\B3$7(B
$B$F!"B?NL$N%G!<%?$rE>Aw$9$k$H;I$5$j$^$9!#(BNetBSD $B%^%7%s$G<h$C(B
$B$?(B tcpdump $B$O2<5-$N$H$*$j$G$9!#(B

NetBSD $B$,Ej$2$h$&$H$7$F$$$k(B IP datagram $B$N%5%$%:$O!"(BEthereal 
$B$G8+$?$H$3$m(B

MSS 1414 + TCP header 32 + IP header 20 = 1466

$B$G$9!#$^$?!"$3$N(B datagram $B$O(B DF $B$,N)$C$F$$$J$$$N$G(B FreeBSD
box $B$O(B fragment $B$7$FE>Aw$7$h$&$H$7$F$$$k$O$:$G$9!#860x$,(B 
FreeBSD box $B$K$"$k$N$+!"(BNetBSD box $B$K$"$k$N$+!"(BInternet $B$N8~(B
$B$3$&B&$K$"$k$N$+$K$D$$$F$O!"$^$@DI$$$-$l$F$$$^$;$s!#(B

$B$?$@!"JL$N>l=j$+$i$3$N(B NetBSD box $B$K@\B3$7$?$H$-$O!"(Bfragment 
$B$5$l$?(B IP datagram $B$r<u?.$7$F$$$?$N$G!"(BFreeBSD box $B$O$-$A$s(B
$B$H(B fragment $B$7$F$$$k$h$&$G$9!#(B

$B$$$:$l$K$;$h!"(BMTU $B$,(B 1454 $B$G$"$kDL?.O)$G(B fragment $B$rH/@8$5$;(B
$B$J$/$9$k$K$O!"(BMSS $B$r(B 1414 $B$K$9$k$@$1$G$OITB-$G$"$k$3$H$O3N$+(B
$B$@$H;W$$$^$9!#(B


tcpdump $B$N7k2L(B

20:35:35.875954 210.252.190.168.1026 > 202.224.211.243.110: S 127849193:127849193(0) win 16384 <mss 1414,nop,wscale 0,nop,nop,timestamp 29188 0> (DF)
20:35:35.876201 202.224.211.243.110 > 210.252.190.168.1026: S 3051566467:3051566467(0) ack 127849194 win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 744998 29188>
20:35:35.978751 210.252.190.168.1026 > 202.224.211.243.110: . ack 1 win 16824 <nop,nop,timestamp 29198 744998> (DF)
20:35:41.111942 202.224.211.243.110 > 210.252.190.168.1026: P 1:65(64) ack 1 win 17520 <nop,nop,timestamp 745008 0>
20:35:41.244184 210.252.190.168.1026 > 202.224.211.243.110: P 1:45(44) ack 65 win 16824 <nop,nop,timestamp 29724 745008> (DF)
20:35:41.251077 202.224.211.243.110 > 210.252.190.168.1026: P 65:96(31) ack 45 win 17520 <nop,nop,timestamp 745009 29724>
20:35:41.352470 210.252.190.168.1026 > 202.224.211.243.110: P 45:51(6) ack 96 win 16824 <nop,nop,timestamp 29735 745009> (DF)
20:35:41.352682 202.224.211.243.110 > 210.252.190.168.1026: P 96:109(13) ack 51 win 17520 <nop,nop,timestamp 745009 29735>
20:35:41.478567 210.252.190.168.1026 > 202.224.211.243.110: P 51:59(8) ack 109 win 16824 <nop,nop,timestamp 29748 745009> (DF)
20:35:41.478923 202.224.211.243.110 > 210.252.190.168.1026: P 109:126(17) ack 59 win 17520 <nop,nop,timestamp 745009 29748>
20:35:41.479320 202.224.211.243.110 > 210.252.190.168.1026: . 126:1540(1414) ack 59 win 17520 <nop,nop,timestamp 745009 29748>
20:35:41.479741 202.224.211.243.110 > 210.252.190.168.1026: P 1540:2954(1414) ack 59 win 17520 <nop,nop,timestamp 745009 29748>
20:35:41.670757 210.252.190.168.1026 > 202.224.211.243.110: . ack 126 win 16824 <nop,nop,timestamp 29768 745009> (DF)
20:35:42.680089 202.224.211.243.110 > 210.252.190.168.1026: . 126:1540(1414) ack 59 win 17520 <nop,nop,timestamp 745011 29748>
20:35:45.680085 202.224.211.243.110 > 210.252.190.168.1026: . 126:1540(1414) ack 59 win 17520 <nop,nop,timestamp 745017 29748>
20:35:51.680105 202.224.211.243.110 > 210.252.190.168.1026: . 126:1540(1414) ack 59 win 17520 <nop,nop,timestamp 745029 29748>
20:36:01.590995 210.252.190.168.1026 > 202.224.211.243.110: F 59:59(0) ack 126 win 16824 <nop,nop,timestamp 31759 745009> (DF)
20:36:01.591176 202.224.211.243.110 > 210.252.190.168.1026: . ack 60 win 17520 <nop,nop,timestamp 745049 31759>


-- 
TERAMOTO Masahiro($B;{K\(B $B>;90(B)
   markun@onohara.to, teramoto@comm.eng.osaka-u.ac.jp
   http://markun.onohara.to/

