[Chilli] Chilli Digest, Vol 63, Issue 12

[Richard REY]

Hi,
I use COOVA in its last version (SVN revision 492) running on an ALCASAR 
appliance (mageia 4.1 - kernel 3.14.32), all is OK excepted a flow issue.
When a TCP stream goes across the appliance there isn't any flow issue 
(forward mode). BUT when a TCP stream is sent inside the appliance (to a 
HTTP proxy for example) the observed flow is very weak (Input mode). The 
problem is maximal when the card connected to COOVA is in the Gigabit mode.

Our investigation :
 From the appliance, we try to download a file located on a FTP server 
connected on the network controlled by COOVA. Without COOVA the observed 
flow in gigabit mode is about 888Mb/s whereas with COOVA we can see just 
68 Kb/s (YES 68 Kb/s). Regarding the packets exchanged we can see ICMP 
packets sent by the appliance (Destination unreachable (Fragmentation 
needed).
We found a by-pass “solution” by fixing the speed of the card to 
100Mb/s. At this speed the phenomenon is practically invisible (just one 
ICMP packet sent) and the flow approaches the maximum supported by the 
network card. On a virtual machine where we can't fix Ethernet speed, we 
must choose a 100Mb/s virtual Ethernet card when building the VM.
We have the Pcap file of our investigation. I say it again, this issue 
is seen only when the TCP flows is sent to an internal processes (in 
'forward' mode all is ok).

Regards
Rexy & ALCASAR team

Le 23/02/2015 08:59, kl a écrit :
> I see problem on kernel version > 3.7 right up to 3.10.  Above 3.10 not tested.
> However, in the other quoted post, it says kernel 2.6.39 upto 3.3.4. Above that not tested.
> Something not consist here.
>
> So which kernel version you guys are using which are seeing this problem ?
>
>
> On Monday, February 23, 2015 3:13 PM, Danny Magat <danny at sb-ps.ae> wrote:
> This problem is still exist on my setup.
> http://lists.coova.org/pipermail/chilli/2013-November/002437.html
>
> I hope that somebody will give us a hint on how to solve this.
>
> Regards,
> Danny
>
> -----Original Message-----
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> Of chilli-request at coova.org
> Sent: Sunday, February 22, 2015 4:00 PM
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> Subject: Chilli Digest, Vol 63, Issue 12
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>     1. Too sharp upload bandwidth limit on 1gbps wired network (kl)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 22 Feb 2015 02:21:53 +0000 (UTC)
> From: kl <kl522 at yahoo.com>
> To: Chilli List <chilli at coova.org>
> Subject: [Chilli] Too sharp upload bandwidth limit on 1gbps wired
>      network
> Message-ID:
>      <122480453.6349415.1424571713923.JavaMail.yahoo at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
>
>
> Nobody is facing this issue with coova chilli ?
>
> http://www.coova.org/node/5171
>
> https://github.com/coova/coova-chilli/issues/32
>
> Happens only on Gigabit wired network and certain kernel verson. Applies to
> 1.2.9, 1.3.0 and other versions ....
>
>
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> End of Chilli Digest, Vol 63, Issue 12
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