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HELP PLEASE - Keep losing DNS!!!!!

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12 Jul 2011 16:37 #68575 by robster
Replied by robster on topic Re: HELP PLEASE - Keep losing DNS!!!!!
Okay

UDP Flood Control off and SO FAR I am still working fine after an hour, this morning I could barely manage 5-10 minutes.

Fingers crossed for the morning.

MANY thanks for the assistance.

Robin

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12 Jul 2011 21:45 #68583 by robster
Replied by robster on topic Re: HELP PLEASE - Keep losing DNS!!!!!
And still working 6 hours later.

Fingers crossed.

Robin

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13 Jul 2011 12:22 #68586 by voodle
Replied by voodle on topic Re: HELP PLEASE - Keep losing DNS!!!!!

Robster wrote: Hi Voodie

I am having real trouble getting Syslog on my Mac!

Even tried running Windows syslog on XP under VMware but this has not worked either!

However I DO have full Firewall and DoS enabled including UDP Flood control, I will try and disable and see if that improves things.

I am puzzled though why it was working perfectly for nearly two weeks and then starting exhibiting these problems.

Robin



You need to change the syslog port on the router side to 1024 if you're using the mac syslog client.

Also, that's great that got things working :)
The reason it happens is the UDP threshold is fairly low - with a network generating enough UDP traffic, that can get triggered and because DNS uses UDP, that gets blocked too, upping the threshold also works.

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13 Jul 2011 16:49 #68591 by robster
Replied by robster on topic Re: HELP PLEASE - Keep losing DNS!!!!!
Many thanks for you assistance.

If I was to change the settings, what would you suggest as a good setting?

I have changed to port for syslog but still not able to get anything on Mac or Windows syslogbclients!

Robin

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05 Aug 2011 09:11 #68900 by athruntalan
Replied by athruntalan on topic Re: HELP PLEASE - Keep losing DNS!!!!!
I had a similar issue earlier in the year. Once it was diagnosed, we turned the UDP Flood defense up to 500 threshold over 10 seconds (on the advice of Draytek tech support). No issues since!

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05 Aug 2011 10:40 #68909 by robster
Replied by robster on topic Re: HELP PLEASE - Keep losing DNS!!!!!
Perfect, many thanks.

I have no updated mine with these figures and re-enabled UDP Flood Defence.

Regards.

Robin

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