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Subject: [FreeBSD-users-jp 51445] Re: /dev/bpf0
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> 2.2.8R $B$G!"(Btcpdump $B$rF0$+$=$&$H$7$?$H$3$m!"(B
> tcpdump: /dev/bpf0: Device not configured
> $B$H$$$o$l$F5/F0$7$^$;$s$G$7$?!#(B

QandA $B;H$C$F$d$C$F$/$@$5$$!#(B


[$B4IM}HV9f(B 762]
Q. DHCP$B%/%i%$%"%s%H$K$9$k$?$a$K(B wide-dhcp$B$r%$%s%9%H!<%k$7$?$N$G$9$,!"(B
   dhcpc$B$r<B9T$9$k$H(B $B0J2<$N%(%i!<%a%C%;!<%8$,=P$F(B IP$B%"%I%l%9Ey$r<hF@$G(B
   $B$-$^$;$s!#(B

     Can't open bpf to read the dhcp message : No such file or directory.

A. $B%+!<%M%k$K(B bpfilter (Berkely Packte Filter) $B$NAH$_9~$_$H(B /dev/bpf?
   $B$N%G%P%$%9$,$J$$$H(B $B@_Ld$NMM$J8=>]$K$J$j$^$9!#(B $B%+!<%M%k$N9=@.$N8+D>$7$H(B
   /dev/bpf? $B$N%G%P%$%9$,$"$k$+(B $B3NG'$7$^$9!#(B

   1) $B%+!<%M%k:F9=C[(B
        $B%+!<%M%k%3%s%U%#%0%U%!%$%k$K(B $B2<5-$NMM$J5-=R$,$"$k$+3NG'$7$^$9!#(B
        $B$J$1$l$P(B $B=q$-B-$7$F(B $B:F9=C[$7$F$/$@$5$$!#(B

        pseudo-device bpfilter 4

        $B?t;z$NItJ,$O(B $BAH$_9~$`%U%#%k%?$N?t$G$9!#$3$N?t;z$NJ,$@$1F1;~$K%U%#(B
        $B%k%?$r;H$&$3$H$,=PMh$^$9!#(B

   2) $B%G%P%$%9:n@.(B
       /dev $B%G%#%l%/%H%j$K(B bpf? $B$N%G%P%$%9$,$"$k$+3NG'$7$^$9!#(B $B$J$1$l$P(B
       /dev/MAKEDEV bpf0 $B$H$$$&6q9g$K$7$F:n@.$7$^$9!#(B $B?t;z$NItJ,$O(B $B%+!<%M(B
       $B%k$GMQ0U$7$?%U%#%k%?$N?t$HF1$8$@$1(B $B:n@.$9$l$PNI$$$G$7$g$&!#(B $B?t;z$O(B
       0 $B$+$i;O$^$j$^$9!#(B $BNc$N>l9g$@$H(B bpf0 $B!A(B bpf3 $B$^$G:n@.$7$^$9!#(B
       ($B>/$J$9$.$k$H(B $B@^3Q%+!<%M%k$KAH$_9~$s$@%U%#%k%?$,;H$($J$/$J$j!"B?$9(B
       $B$.$k$H(B $B$=$N%G%P%$%9$O;H$o$l$k$3$H$,$"$j$^$;$s(B)

     $B$3$l$G(B $B;H$($k$O$:$G$9!#(B

     $B$3$N(B bpf (Berkely Packet Filter) $B$H$O!"%M%C%H%o!<%/%$%s%?!<%U%'!<%9$,(B
   $B=&$C$F$/$k%Q%1%C%H$r%f!<%6%W%m%;%9$KEO$7$?$j!"%f!<%6%W%m%;%9$+$i%M%C%H(B
   $B%o!<%/%$%s%?!<%U%'!<%9$X%Q%1%C%H$rEj$2$?$j$9$k$3$H$,=PMh$k2>A[%G%P%$%9(B
   $B$G$9!#(B
     $B%+!<%M%k$,;}$C$F$$$J$$%W%m%H%3%k$O!"(Bbpf $B$rDL$7$F%f!<%6%W%m%;%9$G07$&(B
   $B$3$H$,=PMh$k$h$&$K$J$j$^$9!#(B

     $B>\$7$/$O(B man bpf $B$^$?$O(B jman bpf $B$r$I$&$>!#(B

