Hi,
The server that actually has the problem is:
- FreeBSD 9.0-RELEASE-p3
- Uses IPFW & dummynet for traffic shaping
- Uses PF for firewalling and NAT
- Uses MPD 5.6 for PPPoE server
- Uses freeradius and PostgreSQL for authentication.
I wrote a script some weeks ago that does the following:
=====
#!/bin/sh
RIGHT_GATEWAY='1.1.1.1'
NOC_EMAIL='b...@test.com'
i=5
while [ $i -gt 0 ]
do
if [ `/usr/bin/netstat -rn |grep default |grep $RIGHT_GATEWAY |wc -l` -ne 1
]
then
/sbin/route del -net default
/sbin/route add -net default $RIGHT_GATEWAY
tail -n 100 /tmp/route_monitor.log | mail -s "Default route bug
happened" $NOC_EMAIL
fi
i=`expr $i - 1`
sleep 10
done
=====
I've changed the variables for privacy purposes. This script is executed each
minutes in crontab. So if the gateway changes, it is fixed within 10 seconds (a
mean of 5 seconds).
I have seen multiple days where it doesn't happen at all... Today was a
record!! 43 times between 22:43 and 23:56. It means, 43 times the script
detected the gateway wasn't the good one and had to change it. It looks like it
happens when network usage is higher than usual.. there's obviously a link with
usage...The server isn't using all its resources. I usually see 25% CPU usage
at higher loads... All loads value are almost always under 0.4 and are mostly
around 0.35 for past 15 minutes.
I'm running a route monitor in a screen and I'm sending the output to a
textfile. As you see in the script, I'm sending me the last 100 lines of it and
I only see my script changing the gateway... nothing before is changing it. The
other people experiencing that bug seems to have the same behaviour.
-----Message d'origine-----
De : Alexander V. Chernikov [mailto:melif...@freebsd.org]
Envoyé : 30 septembre 2012 17:07
À : Dominic Blais
Cc : freebsd-net@freebsd.org
Objet : Re: Default route destination changing without warning follow-up
On 01.10.2012 00:59, Dominic Blais wrote:
> It's all about IPv4 in my case.
It will be great to supply some more details (e.g. like FreeBSD version,
interfaces configuration, netstat -rn output).
How often does this happen ?
(e.g. while true; do echo -n `date` ; route -n get default | grep gate; sleep
1; done can help)
If this is reproducible, what actions precedes this change?
Maybe some ARP traffic on that interface, or interface creation/deletion, or.. ?
Is route monitor completely silent when the change happens?
>
>
> --
>
>
>
> -----Message d'origine-----
> De : Alexander V. Chernikov [mailto:melif...@freebsd.org] Envoyé : 30
> septembre 2012 16:39 À : Dominic Blais Cc : freebsd-net@freebsd.org
> Objet : Re: Default route destination changing without warning
> follow-up
>
> On 01.10.2012 00:33, Dominic Blais wrote:
>> Yes, I'm very sure of it! A "route monitor" show no changes when it happens.
>> I've heard of another person with the same bug that has no traces in "route
>> monitor" either... We have in common that we're using IPFW and PF.
> So, are we talking about IPv4 or IPv6?
>>
>>
>>
>> --
>>
>>
>>
>> -----Message d'origine-----
>> De : Alexander V. Chernikov [mailto:melif...@freebsd.org] Envoyé : 30
>> septembre 2012 16:31 À : Dominic Blais Cc : freebsd-net@freebsd.org
>> Objet : Re: Default route destination changing without warning
>> follow-up
>>
>> On 01.10.2012 00:00, Dominic Blais wrote:
>>> Hi,
>> Hello!
>>>
>>> I was just wondering if there was anything new about the bug of default
>>> route changing without warning... Is there any test I can do to help
>>> fixing it?
>> Can you be a bit more precise and specify FreeBSD version and address family?
>>
>> Are you sure that it is not changed by some other userland process (e.g.
>> did you do some `route monitor` checks) ?
>>>
>>> --
>>> [cid:image001.gif@01CD9F24.B366CBF0]
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> freebsd-net@freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-net
>>> To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
>>
>>
>
>
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