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Subject[BUG/2.4.x] Proc / sysctl bug
Hi,

proc interface to sysctl is unable to handle acces to interfaces
parameters that are configured by when you have a lot of interfaces, only
"all" + "default" + 133 first interfaces or something like that are
accessible via /proc/sys/net/ipv4/conf/.

Via sysctl() syscall these seemed to work fine when I last checked. I
sometimies keep wondering why each kernel function including this is
accessible via two different interface. =)

Brief demo example on procfs sysctl interface with tunnels follows.

Altough if one loads for example ipv6 module after executing the script
below, the ipv6 module is not able to register to proc-filesystem.

I've tested this against RedHat kernel 2.4.18 and 2.4.20pre3.

--- tunnel.pl ---
#!/usr/bin/perl -w

$i = 1;

while($i < 200) {
$cmd = "/sbin/ip tunnel add sit$i remote 192.168.1.$i local 192.168.1.2 dev eth0 mode ipip";
print $cmd."\n";
system($cmd);
$cmd="/sbin/ip addr add 192.168.1.2/24 dev sit$i";
print $cmd."\n";
system($cmd);
$cmd="/sbin/ip link set sit$i up";
print $cmd."\n";
system($cmd);
$i++;
}

system#./tunnel.pl
...
system# /sbin/ip addr show dev sit199
202: sit199@eth0: <POINTOPOINT,NOARP,UP> mtu 1480 qdisc noqueue
link/ipip 192.168.1.2 peer 192.168.1.199
inet 192.168.1.2/24 scope global sit199
system#ls /proc/sys/net/ipv4/conf/
all sit107 sit12 sit14 sit28 sit40 sit53 sit66 sit79 sit91
default sit108 sit120 sit15 sit29 sit41 sit54 sit67 sit8 sit92
eth0 sit109 sit121 sit16 sit3 sit42 sit55 sit68 sit80 sit93
lo sit11 sit122 sit17 sit30 sit43 sit56 sit69 sit81 sit94
sit0 sit110 sit123 sit18 sit31 sit44 sit57 sit7 sit82 sit95
sit1 sit111 sit124 sit19 sit32 sit45 sit58 sit70 sit83 sit96
sit10 sit112 sit125 sit20 sit33 sit46 sit59 sit71 sit84 sit97
sit100 sit113 sit126 sit21 sit34 sit47 sit6 sit72 sit85 sit98
sit101 sit114 sit127 sit22 sit35 sit48 sit60 sit73 sit86 sit99
sit102 sit115 sit128 sit23 sit36 sit49 sit61 sit74 sit87
sit103 sit116 sit129 sit24 sit37 sit5 sit62 sit75 sit88
sit104 sit117 sit13 sit25 sit38 sit50 sit63 sit76 sit89
sit105 sit118 sit130 sit26 sit39 sit51 sit64 sit77 sit9
sit106 sit119 sit131 sit27 sit4 sit52 sit65 sit78 sit90
system# ls /proc/sys/net/ipv4/conf/sit199
ls: /proc/sys/net/ipv4/conf/sit199: No such file or directory
system# ls /proc/sys/net/ipv4/conf/|wc -l
135

Thanks,
Sampsa Ranta



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