[Cerowrt-devel] Issues with 5ghz after a couple of days' uptime

[Cerowrt-devel] Issues with 5ghz after a couple of days' uptime

[Toke Høiland-Jørgensen]

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So I've had a strange issue with the 5ghz network on my wndr after a few
days' uptime: Packets stopped getting through on the 5ghz network. I.e.
clients already connected could no longer connect to anything, and
trying to connect a new client resulted in the wlan association
succeeding, but the clients failing to get a DHCP lease.

There's nothing in the logs to indicate what might be wrong (no DMA
errors or anything like that). 'logread' shows dnsmasq receiving and
replying to DHCP requests, but the answers never reach the clients.

Restarting the wireless (i.e. running 'wifi') fixed it.

Any ideas? I'm on 3.10.32-12(ish). Built from git commit
9bbc728cb7508dce24c480ac63d6e4f63d5c02f5 from the cerowrt-3.10 repo. :)

-Toke

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Re: [Cerowrt-devel] Issues with 5ghz after a couple of days' uptime

[Dave Taht]

This sounds like the problem jim gettys is having on 2.4ghz. It takes
1+ days to happen. We've ruled out ipv6 tunneling and syns as the
cause... he is presently running without syn flood, ipv6, and now WPA
support in the hope that that's a cause (there is a fix for WPA stuff
in 3.10.34 pending)

are you using WPA?

taking a long term packet capture seems worthwhile.


On Fri, Mar 28, 2014 at 1:04 AM, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> So I've had a strange issue with the 5ghz network on my wndr after a few
> days' uptime: Packets stopped getting through on the 5ghz network. I.e.
> clients already connected could no longer connect to anything, and
> trying to connect a new client resulted in the wlan association
> succeeding, but the clients failing to get a DHCP lease.
>
> There's nothing in the logs to indicate what might be wrong (no DMA
> errors or anything like that). 'logread' shows dnsmasq receiving and
> replying to DHCP requests, but the answers never reach the clients.
>
> Restarting the wireless (i.e. running 'wifi') fixed it.
>
> Any ideas? I'm on 3.10.32-12(ish). Built from git commit
> 9bbc728cb7508dce24c480ac63d6e4f63d5c02f5 from the cerowrt-3.10 repo. :)
>
> -Toke
>
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>



-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html

Re: [Cerowrt-devel] Issues with 5ghz after a couple of days' uptime

[Aaron Wood]

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As a contra-datapoint:

4d uptime here, but without any ipv6.  A couple GB of data, both
WAN<->internal, and between 5GHz devices (pushing to an AppleTV).  No real
traffic between 2.4 and 5GHz, though.

WPA2 on all interfaces (babel and guest interfaces are disabled).

-Aaron

On Fri, Mar 28, 2014 at 5:39 PM, Dave Taht <dave.taht@gmail.com> wrote:

> This sounds like the problem jim gettys is having on 2.4ghz. It takes
> 1+ days to happen. We've ruled out ipv6 tunneling and syns as the
> cause... he is presently running without syn flood, ipv6, and now WPA
> support in the hope that that's a cause (there is a fix for WPA stuff
> in 3.10.34 pending)
>
> are you using WPA?
>
> taking a long term packet capture seems worthwhile.
>
>
> On Fri, Mar 28, 2014 at 1:04 AM, Toke Høiland-Jørgensen <toke@toke.dk>
> wrote:
> > So I've had a strange issue with the 5ghz network on my wndr after a few
> > days' uptime: Packets stopped getting through on the 5ghz network. I.e.
> > clients already connected could no longer connect to anything, and
> > trying to connect a new client resulted in the wlan association
> > succeeding, but the clients failing to get a DHCP lease.
> >
> > There's nothing in the logs to indicate what might be wrong (no DMA
> > errors or anything like that). 'logread' shows dnsmasq receiving and
> > replying to DHCP requests, but the answers never reach the clients.
> >
> > Restarting the wireless (i.e. running 'wifi') fixed it.
> >
> > Any ideas? I'm on 3.10.32-12(ish). Built from git commit
> > 9bbc728cb7508dce24c480ac63d6e4f63d5c02f5 from the cerowrt-3.10 repo. :)
> >
> > -Toke
> >
> > _______________________________________________
> > Cerowrt-devel mailing list
> > Cerowrt-devel@lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/cerowrt-devel
> >
>
>
>
> --
> Dave Täht
>
> Fixing bufferbloat with cerowrt:
> http://www.teklibre.com/cerowrt/subscribe.html
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>

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Re: [Cerowrt-devel] Issues with 5ghz after a couple of days' uptime

[David Personette]

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I had complete failure to respond on 3.10.32-10 and -11 after less than a
hour of uptime. I was assuming that it was due to my keeping the
configuration files, and that something had changed in OpenWRT head and/or
dnsmasq. I didn't have time to do another merge at the time, and had just
flashed back to 3.10.32-9.

When 3.10.32-12 came out I checked the files, and didn't find any issues
with the configuration files. I also haven't had any more hangs. I have
ipv6 through he, and syn flood protection turned on. No issues to date with
-12.

-- 
David P.



On Fri, Mar 28, 2014 at 12:51 PM, Aaron Wood <woody77@gmail.com> wrote:

> As a contra-datapoint:
>
> 4d uptime here, but without any ipv6.  A couple GB of data, both
> WAN<->internal, and between 5GHz devices (pushing to an AppleTV).  No real
> traffic between 2.4 and 5GHz, though.
>
> WPA2 on all interfaces (babel and guest interfaces are disabled).
>
> -Aaron
>
> On Fri, Mar 28, 2014 at 5:39 PM, Dave Taht <dave.taht@gmail.com> wrote:
>
>> This sounds like the problem jim gettys is having on 2.4ghz. It takes
>> 1+ days to happen. We've ruled out ipv6 tunneling and syns as the
>> cause... he is presently running without syn flood, ipv6, and now WPA
>> support in the hope that that's a cause (there is a fix for WPA stuff
>> in 3.10.34 pending)
>>
>> are you using WPA?
>>
>> taking a long term packet capture seems worthwhile.
>>
>>
>> On Fri, Mar 28, 2014 at 1:04 AM, Toke Høiland-Jørgensen <toke@toke.dk>
>> wrote:
>> > So I've had a strange issue with the 5ghz network on my wndr after a few
>> > days' uptime: Packets stopped getting through on the 5ghz network. I.e.
>> > clients already connected could no longer connect to anything, and
>> > trying to connect a new client resulted in the wlan association
>> > succeeding, but the clients failing to get a DHCP lease.
>> >
>> > There's nothing in the logs to indicate what might be wrong (no DMA
>> > errors or anything like that). 'logread' shows dnsmasq receiving and
>> > replying to DHCP requests, but the answers never reach the clients.
>> >
>> > Restarting the wireless (i.e. running 'wifi') fixed it.
>> >
>> > Any ideas? I'm on 3.10.32-12(ish). Built from git commit
>> > 9bbc728cb7508dce24c480ac63d6e4f63d5c02f5 from the cerowrt-3.10 repo. :)
>> >
>> > -Toke
>> >
>> > _______________________________________________
>> > Cerowrt-devel mailing list
>> > Cerowrt-devel@lists.bufferbloat.net
>> > https://lists.bufferbloat.net/listinfo/cerowrt-devel
>> >
>>
>>
>>
>> --
>> Dave Täht
>>
>> Fixing bufferbloat with cerowrt:
>> http://www.teklibre.com/cerowrt/subscribe.html
>> _______________________________________________
>> Cerowrt-devel mailing list
>> Cerowrt-devel@lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>>
>
>
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>
>

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Re: [Cerowrt-devel] Issues with 5ghz after a couple of days' uptime

[Toke Høiland-Jørgensen]

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Dave Taht <dave.taht@gmail.com> writes:

> are you using WPA?

Yes, but the open guest network on 5ghz didn't work either (same radio,
different SSID).

> taking a long term packet capture seems worthwhile.

Right, will try that; suggestions for storing the trace? (is there
remote filesystem support in cero?) Also, how many bytes of each packet
to capture?

-Toke

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Re: [Cerowrt-devel] Issues with 5ghz after a couple of days' uptime

[Dave Taht]

I typically toss captures onto a usb stick attached to the cero box.

in this case I have been capturing both ge00 and swXX traffic to
separate files trying to find when things go wrong and why



On Fri, Mar 28, 2014 at 11:48 AM, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> Dave Taht <dave.taht@gmail.com> writes:
>
>> are you using WPA?
>
> Yes, but the open guest network on 5ghz didn't work either (same radio,
> different SSID).
>
>> taking a long term packet capture seems worthwhile.
>
> Right, will try that; suggestions for storing the trace? (is there
> remote filesystem support in cero?) Also, how many bytes of each packet
> to capture?
>
> -Toke



-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html