[lwip-users] Re: [lwip] Problem running under Linux 2.4

[Felipe Massia Pereira]

Hello,

1. check the permissions of the file. I dont know if a user other than
root can use /dev/net/tun, so the best choice is run lwIP as root.

2. here is my tun dev:

~ $ ls -l /dev/net/tun 
crw-r--r--    1 root     root      10, 200 Sep  6 15:53 /dev/net/tun

Thats' for Linux 2.4.18 but should be compatible with Linux 2.4.2-2 as
well. If this is not correct for you, use mknod to create a char file
/dev/net/tun with major 10 and minor 200, as root (mknod has man page).

3. I guess this is your problem: You should check if the driver module is
loaded. As root type "insmod tun" and lwIP should work now. 
Type "tail /var/log/messages" just after running lwIP simulation; if the
problem is the module, this file should have a message of warning like
"can not load module for char-major-10-200". You can include the line
"alias char-major-10-200 tun" in your /etc/modules.conf and the module
will be loaded on demand if you have kernel modules autoloader, but dont
mind about that if it's not working with "insmod tun".

that's it
Felipe


On Sat, 14 Sep 2002, Ganesh  S wrote:

> 
> Probably this related question has been asked many times. I looked at
> the list archives but could not find a solution to this. Can someonw let
> me know a solution to this problem ?
> 
> Iam trying to run lwip-0.5.3 under a machine running linux 2.4.2-2. I
> also installed the tun-1.1 package. I was able to compile lwip for
> unixsim.  I can see a tun device as /dev/net/tun. However, when I try to
> run simhost I get the following output:
> 
> System initialized.
> TCP/IP initialized.
> Error /dev/net/tun
> tapif_init: No such device
> 
> >From the tapif.c code under arch/unix/ I find that an open call to the
> device /dev/net/tun is failing with an error No such device. 
> 
> Thanks
> Ganesh
> 
> 
> 
> 

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