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4701 posts

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Topic # 147198 12-Jun-2014 11:03
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This one has me tearing my hair out.

We have a couple of Internet connections in our office to provide WiFi to staff (completely separate from the corporate network) and for guests.

One is a 100Mbs connection to DTS. The other is Vodafone UFB.  The DTS connection will be disconnected once UFB has proved to provide our needs.

Both connections terminate in a Mikrotik router with the router configured to handle UFB. Nothing special needed to be done for the DTS connection since it's basically a 100Mbs Citylink connection.

The outbound ports on the Mikrotik go to small switches off which hang a number of AP's (mainly Netgear with one Linksys and Belkin).

The Mikrotik is set to do DHCP etc so the AP's connect via their LAN ports.

Everybody has no issue with connecting to the Internet on the Vodafone UFB connection, except with my Nexus 5. This device can access all of the AP's,  can ping the DNS servers and other sites via IP but cannot access the Internet. Clearly DNS is not being resolved on the phone. I have even tried putting in the IP address of some sites but no access. The phone has no issue on any other AP's (such as at home). Even my Nexus 7 (2013) can connect fine. 

I have done the obvious things like forget the AP's, add them back, do manual DNS entries to no avail. I haven't done a factory reset which I am reluctant to do given it works fine on all other AP's. The phone is on 4.4.3 which occurred the other day but the problem was in existence before that.

But what makes it even more puzzling is, if I reconnect one of the AP's into the DTS Internet connection, the phone connects to the Internet fine via that AP.

Anybody with any thoughts on how I could resolve this?

I have no other N5 to test with. 

 

 

 

Thanks




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast

 


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https://plus.google.com/+laurencechiu

 

 


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830 posts

Ultimate Geek
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  Reply # 1063916 12-Jun-2014 11:17
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What you actually seem to be saying is that the phone has Internet access but name resolution is not working on it.

What DNS server is the phone being given, and do you have any static routes configured in the router?

Can you manually set the DNS servers on the phone?





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  Reply # 1064103 12-Jun-2014 14:25
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Glassboy: What you actually seem to be saying is that the phone has Internet access but name resolution is not working on it.

What DNS server is the phone being given, and do you have any static routes configured in the router?

Can you manually set the DNS servers on the phone?




Apparently so.

The DNS servers the phone is showing are

203.109.129.67
203.109.129.68

There are static routes on the router but on a different interface and if they interfered, it would impact all users. It's only my N5 that is affected.

I can manually set the DNS on the phone. I tried 8.8.8.8 and 8.8 4.4 with no change.

Of course now that I check, it's working again!  

This is what is puzzling. It was working for months, then stopped working for about a week and once I post here, it starts to work again.

I suspect it's going to croak again. I hate situations where I don't know what is wrong or what fixed it.




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast

 


My Google+ page 

 

 

 

https://plus.google.com/+laurencechiu

 

 


 
 
 
 


830 posts

Ultimate Geek
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  Reply # 1064107 12-Jun-2014 14:28
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I wouldn't assume that static routes will effect everything equally.  I've seen some strange behaviour recently with mobile devices.  It's also really hard to work out what it is when all the typical tools aren't available.



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  Reply # 1064112 12-Jun-2014 14:34
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Glassboy: I wouldn't assume that static routes will effect everything equally.  I've seen some strange behaviour recently with mobile devices.  It's also really hard to work out what it is when all the typical tools aren't available.


Since I can connect to the AP and to the Internet. what I might do is ask my firewall vendor to do a packet trace from my phone to the Internet and see what is happening.




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast

 


My Google+ page 

 

 

 

https://plus.google.com/+laurencechiu

 

 


830 posts

Ultimate Geek
+1 received by user: 259

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  Reply # 1064175 12-Jun-2014 15:36
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lchiu7:
Glassboy: I wouldn't assume that static routes will effect everything equally.  I've seen some strange behaviour recently with mobile devices.  It's also really hard to work out what it is when all the typical tools aren't available.


Since I can connect to the AP and to the Internet. what I might do is ask my firewall vendor to do a packet trace from my phone to the Internet and see what is happening.


I'm pretty sure that RouterOS can be a DNS proxy.  If it happens again can you set it to use the router as the DNS and see if the problem still happens?

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