[quagga-users 14098] Re: enabling ECN

durga c.vijaya.durga at gmail.com
Thu Aug 6 09:37:52 BST 2015

Hi all,

closing the issue,
I enabled fq_codel using the example provided at
http://manpages.ubuntu.com/manpages/trusty/man8/tc-fq_codel.8.html and
voila!! I see that the ecn-echo bit is set in TCP header.

Thanks again!


On Thu, Aug 6, 2015 at 5:34 PM, durga <c.vijaya.durga at gmail.com> wrote:

> :D
> Hi Mikael
> I realised it once I tested, that flag really did not have any effect on
> routers as AQM was not enabled( as correctly mentioned in your earlier post
> and I misunderstood), I am using linux containers running quagga as routers
> and I am currently considering configuring CoDel AQM and see how the
> network behaves.
> Thanks again for the inputs.
> Cheers!
> Durga
> On Thu, Aug 6, 2015 at 4:51 PM, Mikael Abrahamsson <swmike at swm.pp.se>
> wrote:
>> On Thu, 6 Aug 2015, durga wrote:
>> H
>>> ​i Mikael,
>>> I am currently looking at setting buffer limits and observe the packets
>>> for
>>> ECN flag. I am not yet planning to mitigate the effects of congestion by
>>> implementing Fair Queueing,
>>> The ecn flag as in /proc/sys/net/ipv4 is set to 2 which I think indicates
>>> that the host responds an to incoming packets activated with ecn but
>>> doesn’t trigger outgoing packets ​with ecn, I might have misunderstood it
>>> though.
>> This is for packets that are actually originated or ultimately destined
>> to the host. This flag does nothing for packets being routed through the
>> machine. Just want to make that clear so there is no misunderstanding.
>> --
>> Mikael Abrahamsson    email: swmike at swm.pp.se
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