Re: Vista not connecting through ADSL router to Orange broadband - possible MTU problems?
- From: "Alastair" <email@xxxxxxxxxxxxxxx>
- Date: Fri, 15 Jun 2007 00:00:24 +0100
"Jonathan" <digitaltoast@xxxxxxxxx> wrote in message news:1181861472.476351.127970@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I'd be very grateful if someone could help me help a non-techy friend
out, who's desperate to get back online so she can finish her
coursework.
They live too far away to just drop by, so I'm doing it over the
phone.
Over the course of a three hour phone call, I established the
following:
She has Windows Vista Home Basic.
It is connected via a LAN cable to an Etec ADSL router.
It used to be connected via a USB modem (which is faulty and kept
crashing the PC)
She can get into the admin page of the router, which shows that it is
connected to the internet.
example, BBC News on 212.58.226.29From a command line on the PC, she can ping an IP address, for
The packets go fine.
If she types ping news.bbc.co.uk, it says it cannot find the server
If she types ping -l 1500 212.58.226.29 she gets 100% packet loss.
On the internet connection status, it says:
ipv4 connected
ipv6 limited
If she goes to the diagnostics, it says:
"The security policy settings on this computer might be blocking the
connection. The following policy might need to be adjusted to allow
windows to connect.
Policy provider: Windows firewall
Filter Name: query user
If the policy provider identified is windows firewall, click for
information about adjusting windows firewall settings
If a different policy provider has been identified, check the
providers document".
Insofar as the PC can talk to the router and the router can talk to
the internet and small packet pings work but bigger packets don't, I
thought it must be the MTU settings.
The router defaults were: mtu:1492 mru:1492 mss:1432
The router is running PPPoA on Orange broadband on the BT network I
believe.
I went and Googled extensively and found an alternative setting of
1420 in all boxes, which we applied and rebooted, but the result was
the same.
I then found these pages:
http://www.microsoft.com/technet/community/columns/cableguy/cg1005.mspx
http://www.chris123nt.com/guides/5365/
http://tweakhound.com/vista/tweakguide/page_9.htm
In particular, the last two sites recommend disabling IPv6, which
makes sense as it was that which reported limited connectivity. So, we
made the box look like the "recommended" on on the tweakhound site,
and reset the mtu, mru and mss to default. Rebooted everything, but
again, pinging IP works, pinging IP with larger packets or by name
doesn't, and ip addresses in websites don't work.
To my limited experience, it seems a classic case of fragmented
packets and MTU problems. But having only used Vista for about 20
minutes, I'm now lost. We've been trying to resolve it since 8pm and
it's now coming up to midnight, so I'm really hoping one of you good
people can come up with a suggesting, bearing in mind that although
she's a bright lass, she's not a computer whizzkid, so registry edits
might be going a bit far.
Disable the Windows firewall.
Ensure the DNS settings for the PC are the ISP DNS servers - or the
router IP if she doesn't know these.
It's a DNS problem - firewall or incorrect settings.
.
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