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br2684ctl only allows 2 packages to be transmitted

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With the br2684ctl package so far I have only been able to transmit two packages successful, but all subsequent transmit package gives an error.
In the ifconfig nas[number] output I have seen a max counter of 'TX packets:2', and all subsequent packages show up as overruns.
I tried with different buffer sizes, but don't see a difference.


Code:

# ifconfig nas0
nas0      Link encap:Ethernet  HWaddr 00:00:00:00:00:02
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:914 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:5952 dropped:0 overruns:5952 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:522068 (509.8 KiB)  TX bytes:709 (709.0 B)

Different buffersizes used:
Code:

br2684ctl -s 65535 -b -e 0 -c 0 -a 1.34
br2684ctl -s 65536 -b -e 0 -c 0 -a 1.34
br2684ctl -s 204800 -b -e 0 -c 0 -a 1.34
br2684ctl -s 102400 -b -e 0 -c 0 -a 1.34

Before sending a packet:
Code:

# cat /proc/net/atm/vc
Address Itf VPI VCI  Fam Flags Reply Send buffer    Recv buffer      [refcnt]
82898800  0  1    34 PVC 0043      0      0/ 204800      0/ 204800 [2]

after some packets have been send:
Code:

# cat /proc/net/atm/vc
Address Itf VPI VCI  Fam Flags Reply Send buffer    Recv buffer      [refcnt]
82898800  0  1    34 PVC 0043      0  -1792/ 204800      0/ 204800 [2]

With two successful packages it is just possible to obtain an IP address via DHCP (discover, request), but than the fun stops.
But if there is no offer, it stops at a second discovery (TX packets:2).

Someone any advice how to debug any further?
Or did have it working normally on FB?

Tested on a FB7390 with Firmware 84.06.20 / trunk-revision 12752

Found references:
[1] http://www.ip-phone-forum.de/showthread.php?t=225135
[2] http://blog.hyfather.com/blog/2013/03/04/ifconfig/
[3] http://www.computerhope.com/unix/uifconfi.htm
[4] http://sourceforge.net/p/linux-atm/m...ssage/8684676/
[5] http://sourceforge.net/p/linux-atm/m...ch/?q=overruns

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