Hi.

A company I work for recently changed hands and subsequently ISP to Optus.
I have a bridged modem with a whitebox gateway which had worked
flawlessly; certainly the web.
After the change to Optus I swapped out the relevant details - static
IP, DNS servers and so on.
Everything appeared to work - I can access most of the web in a
browser - but some significant portions are missing.
For instance, ato.gov.au is fine but humanservices.gov.au never loads
... bbc.co.uk works great but whirlpool.net.au doesn't appear ...
mozilla.org is fine but microsoft.com is a no show.

I've had a look at resolving on the internal machines and it seems fine.
For instance, here's netstat after I type whirlpool.net.au in a
browser on a Windows client:

netstat -a

Active Connections

  Proto  Local Address          Foreign Address        State
  TCP    local:1031             171-171-53-117.rev.bulletproof.net:http  ESTABLI
SHED

netstat -a -n

Active Connections

  Proto  Local Address          Foreign Address        State
  TCP    192.168.1.250:1031     117.53.171.171:80      ESTABLISHED

I can ping domains by name and so on - it looks like a HTTP issue.

Here's the kicker, if I bypass the bridged modem and OpenBSD gateway
using an Optus supplied modem ... the entire web appears to work as
expected.
Sorry for the long winded explanation.
The issue is probably very obvious to someone and I'd love to hear about it. :]
I've tried a bunch of stuff but it's a bit hard to get downtime to check stuff.
Obviously off list replies are great.

Best wishes.
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