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Strange DNS behaviour, randomly fails resolving
Posted: Sat Sep 01, 2007 7:08 pm
by Lollo
Hi there,
I just started noticing a strange DNS behaviour on my RouterOS box. Let's say that's my network:
PC -> RouterOS 5Ghz CPE ---> Ap --> Bridge ---> PPPoE Server
My PC DNS points to my first hop (RouterOS CPE). RouterOS CPE's DNS points DNS to PPPoE Server Address. PPPoE Server has DNS addresses provided by my ISP.
When I try to resolve certain domain names, it fails and marks them in IP->DNS->Cache with a "N"
If i try to resolve the name directly by using OpenDNS or my ISP DNS, it just works flawlessly. If I just put my ISP DNS in my CPE DNS, it works.
Could it be a bug or something?
Re: Strange DNS behaviour, randomly fails resolving
Posted: Sun Sep 02, 2007 11:50 am
by Equis
YES, I can say I have the same bug
DNS works for a few days under high load then stops resolving untill next reboot.
I wonder if it is alot of work to out service watchdog in RouterOS?
Re: Strange DNS behaviour, randomly fails resolving
Posted: Sun Sep 02, 2007 12:10 pm
by Lollo
Well, at least I know I'm not the only one experiencing that weird behaviour
Should we file a bug?
Re: Strange DNS behaviour, randomly fails resolving
Posted: Sun Sep 02, 2007 12:13 pm
by Equis
I have spoken to MT about it but they could not replecate the problem.
Perhaps if you did a supout and mention that you have spoken to another pwerson with this problem.
I ended up just installing a Bind DNS but would love to just use MT
Re: Strange DNS behaviour, randomly fails resolving
Posted: Sun Sep 02, 2007 12:19 pm
by Equis
One Day I'll get around to testing this with V3, hopefully it may be already fixed
Re: Strange DNS behaviour, randomly fails resolving
Posted: Sun Sep 02, 2007 12:31 pm
by Lollo
Eheheh
Ok, I'll make a support request
So you solved by using a separate DNS server (bind)? I think I have to follow your steps too, but that's a real pity, I really would like to see things work just with MT
Re: Strange DNS behaviour, randomly fails resolving
Posted: Sun Sep 02, 2007 12:42 pm
by Equis
Yes
I have always had my own Bind dns server but liked having it on the core router.
It mean if power was off for a long time and ups went flat I could run router & radios off 12 volt car Battery and system would still run
Re: Strange DNS behaviour, randomly fails resolving
Posted: Mon Sep 03, 2007 5:06 am
by omega-00
Why not just set the clients to use openDNS directly?
Pretty much guaranteed better uptime anyway
Re: Strange DNS behaviour, randomly fails resolving
Posted: Mon Sep 03, 2007 5:10 am
by Equis
For me I like to Cache DNS
But that would be a good option for a secondary.
Re: Strange DNS behaviour, randomly fails resolving
Posted: Mon Sep 03, 2007 9:56 am
by Lollo
Why not just set the clients to use openDNS directly?
Pretty much guaranteed better uptime anyway
Well, they're way too slow (200 to 300ms latency) from here