----- Original Message -----
From: "Wayne Lee" <wayne.lee@???>
To: "Hampshire LUG Discussion List" <hampshire@???>
Sent: Sunday, August 12, 2007 5:05 PM
Subject: Re: [Hampshire] [OT] Network issue - how to describe
> We used to see this when we had some MTU issue's
>
> The problem was mainly servers and networks that were blocking ICMP,
> they blocked more than just ICMP echo so the correct MTU size could not
> be discovered (microsoft.com was a classic example). This issue would
> also affect email uploads if the mail contained a attachment or a lot of
> replys.
>
> The main problem was we had 100mb links to the main L2TP suppliers and
> the customers connected via PPPoA which reduced the available MTU size.
> Once we upgraded all L2TP links with gig links the problem mostly went
> away, mind you we still set the MTU to be lower (1460) on the virtual
> template to get around most MTU problems. The issue gets worse when
> customers start using VPN's.
>
> It took many hours of fun to debug this and to provide a working
> solution.
>
> Wayne
>
>
>
>
>
> On Sun, 2007-08-12 at 16:17 +0100, Rob Malpass wrote:
>> ----- Original Message -----
>> From: "Tim" <xendistar@???>
>> To: "Hampshire LUG Discussion List" <hampshire@???>
>> Sent: Saturday, August 11, 2007 10:21 PM
>> Subject: Re: [Hampshire] [OT] Network issue - how to describe
>>
>>
>> On Sat August 11 2007 22:09, Rob Malpass wrote:
>> > Hi all
>> >
>> > I'm experiencing a problem with my ISP - and I need to know the
>> > technical
>> > description of the fault in the hope that I get someone knowledgeable
>> > at
>> > customer service (a pipe dream most likely but nonetheless).
>> >
>> > Symptom: Head for any website and I get a "Internet explorer cannot
>> > display the page". Key in the same address again or hit f5 and hey
>> > presto
>> > - up comes the page.
>> >
>> > I'm in the position of being able to route traffic through another
>> > router
>> > connected to Virgin and no such problems. Having done the usual
>> > things
>> > of
>> > rebooting routers, deleting temporary files etc, the problem only
>> > persists
>> > with Orange.
>> >
>> > Is this DNS? If not, what's the most likely cause? I don't know why
>> > it
>> > takes two attempts to get anywhere - and it doesn't happen with all
>> > website
>> > - just some.
>> >
>> > Cheers
>> > Rob
>>
>> Try entering the IP address for a particular site in the address bar,
>> does
>> it
>> load straight away or does it require a F5??
>>
>> Have you tried changing the dns IP's on the router that is causing the
>> problem??
>>
>> Just a couple of quick thoughts?
>>
>> Tim
>>
>> >>>
>>
>> Bizarrely, about 5 minutes after posting, I received a message from
>> OrangeProblems.co.uk and having followed a few links, I was told to
>> change
>> an "MTU" setting in the router which has fixed things nicely.
>>
>> Interesting that it had been working fine on the other MTU setting for
>> around 5 years.
>>
>> Cheers
>> Rob
>>
>>
>>
> --
> Regards
>
> Wayne Lee
> Technical Manager
> Link Connect Services ltd
> Moor Park House
> Moor Park Lane
> Farnham
> Surrey
> Tel :: 0870 7433100
> FAX :: 0870 7433101
> http://www.link-connect.com
> MSN :: wayne.lee@???
>
> --
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>
I was on 1458 which apparently is the fallback position. Changing to 1430
fixed it.
Cheers
Rob
