Tun stability issue

[GoogleCodeExporter]

What steps will reproduce the problem?
1. latest firmware with openvpn (2.1.x)
2. active vpn connection
3. ftp in active mode to other device through tun (not PASV!)
4. router resets

What is the expected output? What do you see instead?
- directory listing of other device
- instead of that router resets a few moments after connection, but before 
directory listing was readed

What version of the product are you using?
2899

Please provide any additional information below.
- previously a have used fw 2408 where these things worked correctly
- with the latest fw my router is also less stable, accidentaly restarts once a 
day or two, it might be related to some tunnel communication
- I have usb WD disk connected
- when I flash fw 2408 back then these problems dissapear

Original issue reported on code.google.com by doleha...@yahoo.com on 21 Apr 2011 at 7:26

[GoogleCodeExporter]

First of all, you didn't tell us which router you use and which firmware ("d" 
or "rtn" branch).

Latest "rtn" firmware has Broadcom "Fast-NAT" feature enabled by default. While 
it has some speed improvements for ordinary customers, it incompatible with 
complex QoS & VPN schemes. So, you have to disable it:

nvram set misc_fastnat_x=0
nvram commit

Original comment by lly.dev on 22 Apr 2011 at 6:45

• Added labels: Type-Support
• Removed labels: Type-Defect

[GoogleCodeExporter]

I'm sorry, I use rt-n16 and rtn fw. It seems that disabling of Fast-NAT has 
solved my issues. Thanks!

Only one more question - you wrote fast-NAT is enabled by default, it means 
after any new fw flash my router came back to active fast-NAT and I should 
apply these instructions again, right?

Original comment by doleha...@yahoo.com on 22 Apr 2011 at 11:03

[GoogleCodeExporter]

nvram variables not changed on newer FW flash, on reset to defaults only.

Original comment by lly.dev on 22 Apr 2011 at 11:21

• Changed state: Done

[GoogleCodeExporter]

test r4320 with fastnat *enabled*

nvram unset misc_fastnat_x
nvram commit

should be no problem.

Original comment by themiron.ru on 10 Jun 2012 at 10:47

• Changed state: Fixed

[GoogleCodeExporter]

i can confirm it works fine now

Original comment by spameden on 13 Jun 2012 at 1:33

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Original comment by themiron.ru on 15 Jun 2012 at 9:05

• Changed state: Verified

[GoogleCodeExporter]

Confirm, fixed.
Great!

Original comment by dole...@yahoo.com on 6 Jul 2012 at 8:23