[Chilli] Chilli Digest, Vol 63, Issue 14

Fri Feb 27 19:50:36 UTC 2015

Usually fragmentation needed means you need to adjust the MTU of your nic.

Alex

On 02/26/2015 02:30 PM, Claus Stjernoe wrote:
> Hi Richard,
>
> Try to disable packet off-loading on the Gigabit NIC.
>
> Kind regards,
> Claus
>
> -----Oprindelig meddelelse-----
> Fra: chilli-bounces at coova.org [mailto:chilli-bounces at coova.org] På vegne af chilli-request at coova.org
> Sendt: 26. februar 2015 13:00
> Til: chilli at coova.org
> Emne: Chilli Digest, Vol 63, Issue 14
>
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> Today's Topics:
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>    1. Re: Chilli Digest, Vol 63, Issue 12 (Richard REY)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 25 Feb 2015 22:48:56 +0100
> From: Richard REY <richard at rexy.fr>
> To: chilli at coova.org
> Subject: Re: [Chilli] Chilli Digest, Vol 63, Issue 12
> Message-ID: <54EE4348.2090503 at rexy.fr>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> 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 ?crit :
>> 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-----
>> From: chilli-bounces at coova.org [mailto:chilli-bounces at coova.org] On 
>> Behalf Of chilli-request at coova.org
>> Sent: Sunday, February 22, 2015 4:00 PM
>> To: chilli at coova.org
>> Subject: Chilli Digest, Vol 63, Issue 12
>>
>> Send Chilli mailing list submissions to
>>      chilli at coova.org
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>>      http://lists.coova.org/cgi-bin/mailman/listinfo/chilli
>> or, via email, send a message with subject or body 'help' to
>>      chilli-request at coova.org
>>
>> You can reach the person managing the list at
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>>
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>> than
>> "Re: Contents of Chilli digest..."
>>
>>
>> Today's Topics:
>>
>>     1. Too sharp upload bandwidth limit on 1gbps wired network (kl)
>>
>>
>> ----------------------------------------------------------------------
>>
>> 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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-- 
; Alexandru Gheorghe
; alghe.global {at} gmail {dot} com
; OpenPGP key ID 0xCAF985D2

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