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Standard User davidjfirman
(learned) Wed 24-Sep-14 23:08:43
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A bit of a strange one.....


[link to this post]
 
..... (which is a phrase used about me too!)

I've recently moved to PN, having suffered with Sky for 10 months after they took over O2, however that's all in the past now.......

I run a relatively (for a home) large LAN with a variety of devices connecting to it running differing O/S: Windows (7&8), Ubuntu, iOS and Synology DSM 5.0.

Pretty much all but the iOS devices are connected via gigabit ethernet, although some of the Win 7 laptops occasionally connect via wi-fi. All relevant O/S updates have been applied to all machines and all the windows machines run the current version of Avast! (2014.9.0.2021). Firewalls are turned on with default settings (Windows own flavour on the respective machines and ufw on the Ubuntu machine)

Here's the problem. From time to time (there is no set pattern), the WIn7 machines will fail to connect to the internet - chrome gives the standard "connecting" message in the bottom left corner of the window. However I can connect to any device on the LAN without problems. When the Win7 machines are internet-less, the Win8 one is fine, as is the Ubuntu machine and the Synology box.

The Win7 "issue" can last anything from 10s to 30 minutes and will go as suddenly as it appears. During this time disabling Avast! has no effect, neither does flushing and renewing the DNS cache. Wireshark does not show anything untoward in the datagrams between the Win7 devices and the Router (a TP-Link W8970) and replacing the router with the PN Technicolour one makes no difference. Although I have 20+ years experience in IT and telecomms, I was never a datagram guru so I might have missed something - any Wireshark experts out there that can suggest some monitoring filters to apply / or what to look for?

The network connection logo in the taskbar will also show the orange exclamation mark and report "no internet access" during the outages.

Any suggestions?

Thanks, in advance, for your help.

[80% of the questons that start with "Why" can be answered with "Because people are stupid"]
plusnet FTTC ~ 30.7 / 16.6 @ 565m
Standard User RobertoS
(elder) Wed 24-Sep-14 23:18:50
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Re: A bit of a strange one.....


[re: davidjfirman] [link to this post]
 
Was this all OK on O2, or even Sky? Or has something on your network also changed since moving to Plusnet? (Basic diagnostic questions).

My broadband basic info/help site - www.robertos.me.uk | Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. - BQM

"Angels can fly because they can take themselves lightly." - G K Chesterton.
Standard User davidjfirman
(learned) Thu 25-Sep-14 00:15:44
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Re: A bit of a strange one.....


[re: RobertoS] [link to this post]
 
PN installed 2 weeks ago. All was OK (apart from the outage which affected loads of people last week) until 2 or 3 days ago when the "Win7" problem started. No kit changes since the BTO modem installed when I moved to PN.

[80% of the questions that start with "Why" can be answered with "Because people are stupid"]
plusnet FTTC ~ 30.7 / 16.6 @ 565m


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Standard User davidjfirman
(learned) Thu 25-Sep-14 00:51:28
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Re: A bit of a strange one.....


[re: davidjfirman] [link to this post]
 
Further information:

I used reserved addresses, configured at the router, ie MAC specific (that way every device always gets the same IP address) and all the clients are set to "obtain an IP address automatically". DNS servers are the PN specific ones (212.159.13.49 and 212.159.6.9). As a test I set one of the Win7 machines to a fixed IP address and changed the DNS servers to Google's (8.8.8.8 and 8.8.4.4) but it made no difference.

[80% of the questions that start with "Why" can be answered with "Because people are stupid"]
plusnet FTTC ~ 30.7 / 16.6 @ 565m
Standard User RobertoS
(elder) Thu 25-Sep-14 01:43:07
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Re: A bit of a strange one.....


[re: davidjfirman] [link to this post]
 
Ah ....

I read somewhere on these forms today about a strange (possibly similar) problem if you specify the DNS servers rather than letting the router pick them up automatically. Not sure if it was Plusnet or some other ISP.

My broadband basic info/help site - www.robertos.me.uk | Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. - BQM

"Angels can fly because they can take themselves lightly." - G K Chesterton.
Standard User davidjfirman
(learned) Thu 25-Sep-14 02:04:07
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Re: A bit of a strange one.....


[re: RobertoS] [link to this post]
 
Ah, interesting.... I was looking at DNS server response times on Monday..... and had changed the router config to look at both PN's and OpenDNS's DNS servers.

So, I have just deleted all entries, rebooted the router and one of the Win7 machines and it still won't connect. Drat.

I have also rolled back (via system restore) to a snapshot taken on Sunday - again to no avail, which rules out a MS update issue. Up until then, everything was pointing towards it being a Win7 issue, but now I am not so sure. All I do know is that without a working Win7 laptop then I'm not able to work - and with me being self-employed this is not a situation I can be in for long!

[80% of the questions that start with "Why" can be answered with "Because people are stupid"]
plusnet FTTC ~ 30.7 / 16.6 @ 565m

Edited by davidjfirman (Thu 25-Sep-14 02:22:07)

Standard User RobertoS
(elder) Thu 25-Sep-14 02:15:58
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Re: A bit of a strange one.....


[re: davidjfirman] [link to this post]
 
Found it.

Similar, not the same, and opposite. Unless you are hard-coding a static external IP address in the router.

Link.

My broadband basic info/help site - www.robertos.me.uk | Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. - BQM

"Angels can fly because they can take themselves lightly." - G K Chesterton.
Standard User davidjfirman
(learned) Thu 25-Sep-14 02:38:12
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Re: A bit of a strange one.....


[re: RobertoS] [link to this post]
 
It's not hard coded into the router (as far as I am aware), but I do have a static IP address. I think I am going to power EVERYTHING down (well, everything related to the LAN / WAN that is!) and see what happens then.

Power on order will be Modem, Router, Win7 machines (and a test for connectivity).

If it passes then I will reintroduce all the other kit one piece at a time, just in case it is affecting the Win7 stuff (unlikely but at this stage I will try anything!)

However, if the power on sequence fails to give Win7 connectivity, I'll plug one of the Win7 machines directly into the BTO Modem and set up a PPPoE connection (thereby removing the router from the equation).

Bl00dy computers!

[80% of the questions that start with "Why" can be answered with "Because people are stupid"]
plusnet FTTC ~ 30.7 / 16.6 @ 565m
Standard User flippery
(committed) Thu 25-Sep-14 10:06:12
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Re: A bit of a strange one.....


[re: davidjfirman] [link to this post]
 
Appears there have been problems with Avast Safe Zone and Windows 7.
Have you tried disabling Avast
Standard User ukhardy07
(knowledge is power) Thu 25-Sep-14 11:58:17
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Re: A bit of a strange one.....


[re: davidjfirman] [link to this post]
 
Sounds most likely to be a router issue.

I would reset the router, try it with everything on auto, so no static IP or manual DNS etc. Does that work? Everything on DHCP. Try that for a day or two.

Then re add your settings one at a time.
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