[EdLUG] Network problem

[Malcolm Durie]

Dick,

I do not know who your provider is but i have had similar problem with my virgin cable service. I found that at times the default dns servers were not working to certain requests. I changed my devices to use cloudfare instead and that resolved my issues. 

Regards

Malcolm


> On 13 Feb 2021, at 12:13, Roy <roy at crossford.net> wrote:
> 
> Maybe a DNS issue?
> 
> Some systems have valid DNS cache entries, so they don't need to do the lookup.
> 
> IPv4 vs IPv6 one works but not the other?
> 
> mirror.bytemark.co.uk is at 2001:41c8:20:5fc::1 or 80.68.83.150
> 
> Does using the IP rather than the name in the URL work?
> 
> Regards,
> 
> Roy Bamford.
> 
> 
>> On 13/02/2021 10:19, Dick Middleton wrote:
>> I've got a really weird problem with my network and I'm at a loss as to what to do.
>> Just after midnight on Thurs problems were noticed.  Things stopped downloading from the network.  But not everything.
>> No problems are being seen with Chromebooks and Android phones (wifi) but iPod, TV, network streamer etc have stopped working.
>> My main linux desktop computer has no problems but a couple of arch linux computers do.
>> I've narrowed it down using curl; on working systems curling a webpage
>>   curl -v http://mirror.bytemark.co.uk I get the index page
>> on a non working system it returns nothing - it just hangs waiting.
>> If I provoke a 404
>> curl -v http://mirror.bytemark.co.uk/x then all systems return an error web page.
>> Similar effect with nc
>> printf "GET / HTTP/1.1\r\nUser-Agent: nc/0.0.1\r\nHost: 127.0.0.1\r\nAccept: */*\r\n\r\n" | nc mirror.bytemark.co.uk 80
>> It looks like a routing error but if that was the case all systems would fail and the error page would also not be returned.
>> My brother has simple home page which is returned normally from all systems; again suggesting it's not a routing problem.
>> I'm totally perplexed and would really appreciate some ideas
>> Dick
> 
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