<p>Hi,</p>
<p>Have you tried dropping the MTU?</p>
<p>Cheers,</p>
<div class="gmail_quote">On Aug 4, 2012 5:37 PM, "David Walker" <<a href="mailto:davidianwalker@gmail.com">davidianwalker@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi.<br>
<br>
A company I work for recently changed hands and subsequently ISP to Optus.<br>
I have a bridged modem with a whitebox gateway which had worked<br>
flawlessly; certainly the web.<br>
After the change to Optus I swapped out the relevant details - static<br>
IP, DNS servers and so on.<br>
Everything appeared to work - I can access most of the web in a<br>
browser - but some significant portions are missing.<br>
For instance, <a href="http://ato.gov.au" target="_blank">ato.gov.au</a> is fine but <a href="http://humanservices.gov.au" target="_blank">humanservices.gov.au</a> never loads<br>
... <a href="http://bbc.co.uk" target="_blank">bbc.co.uk</a> works great but <a href="http://whirlpool.net.au" target="_blank">whirlpool.net.au</a> doesn't appear ...<br>
<a href="http://mozilla.org" target="_blank">mozilla.org</a> is fine but <a href="http://microsoft.com" target="_blank">microsoft.com</a> is a no show.<br>
<br>
I've had a look at resolving on the internal machines and it seems fine.<br>
For instance, here's netstat after I type <a href="http://whirlpool.net.au" target="_blank">whirlpool.net.au</a> in a<br>
browser on a Windows client:<br>
<br>
netstat -a<br>
<br>
Active Connections<br>
<br>
Proto Local Address Foreign Address State<br>
TCP local:1031 171-171-53-117.rev.bulletproof.net:http ESTABLI<br>
SHED<br>
<br>
netstat -a -n<br>
<br>
Active Connections<br>
<br>
Proto Local Address Foreign Address State<br>
TCP <a href="http://192.168.1.250:1031" target="_blank">192.168.1.250:1031</a> <a href="http://117.53.171.171:80" target="_blank">117.53.171.171:80</a> ESTABLISHED<br>
<br>
I can ping domains by name and so on - it looks like a HTTP issue.<br>
<br>
Here's the kicker, if I bypass the bridged modem and OpenBSD gateway<br>
using an Optus supplied modem ... the entire web appears to work as<br>
expected.<br>
Sorry for the long winded explanation.<br>
The issue is probably very obvious to someone and I'd love to hear about it. :]<br>
I've tried a bunch of stuff but it's a bit hard to get downtime to check stuff.<br>
Obviously off list replies are great.<br>
<br>
Best wishes.<br>
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</blockquote></div>