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On Thursday 01 July 2004 18:18, [email protected] wrote:
> Is there any known Limitation to 100 TUN-Devices or how can we break that
> limitation?
This is a limitation in the Linux kernel code not in OpenVPN.
The limitation is in net/core/dev.c
You can change this by modifying the value and kernel recompile.
See in net/core/dev.c:
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/*
* If you need over 100 please also fix the algorithm...
*/
for (i = 0; i < 100; i++) {
snprintf(buf,sizeof(buf),name,i);
if (__dev_get_by_name(buf) == NULL) {
strcpy(dev->name, buf);
return i;
}
}
return -ENFILE; /* Over 100 of the things .. bail out! */
}
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Note that performance will be bad when going beyond about 200 or 300 devices
on a modern pc.
It is better to replace the code by a hashed device lookup. I found out that
this is the case in my debian 2.6. kernel. I haven't checked when this was
introduced and whether this is a debian patch or present in the vanilla
kernel code.
I can send you a patch by mail for the 2.4.26 kernel which also should apply
back to 2.4.18 or lower. This was written by Ben Greer for VLAN support and I
modified it to apply cleanly to 2.4.18 and higher. Linus rejected this patch
for the 2.4 series. It works for me on more than 30 servers without any
problems.
A linux distro including this patch is Adamantix (www.adamantix.org)
Torge
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