[Vtun-Users] TUN/TAP problems in 2.4.6-2.4.14

[Maksim K. <ma...@qu...>]

Folks,

Summary on TUN/TAP problems with recent kernels.

Problem #1: 
	Can't allocate tunX or tapX. File descriptor in bad stage (EBADFD). 
Reason:  
	TUN/TAP API change in kernel 2.4.6. 
Solution:
	Copy /usr/src/linux/include/linux/if_tun.h to /usr/include/linux/if_tun.h.
	Upgrade VTun to version 2.5.b1 and recompile.

	Code in CVS has support for both old (pre 2.4.6) and new APIs. 
	2.5b2 final will be released soon.

Problem #2: 
	Can't allocate tunX or tapX. Invalid argument (EINVAL). 
Reason:  
	Bug in kernel networking code (linux/net/code/dev.c) introduced somewhere in 2.4.10 - 2.4.14.
Solution:
	This bug has been fixed in 2.4.5-pre2. 
	Upgrade kernel to at least 2.4.15-pre5.

	Or do not use static device names in vtund.conf. ie comment out "device" options.
	Dynamic device allocation works just fine.

Regards
Max

Maksim Krasnyanskiy	
Senior Kernel Engineer
Qualcomm Incorporated

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