Strange internet issues

[mrbios]

Replaced our leased line a few weeks ago, previously we had a setup with proxy servers and ISA2006. Now we're using a fortinet firewall and lightspeed filter (it's a school) on a 100mb leased line which are both hosted solutions.

I seem to be having some odd problems though, the first of which is that as an example i can't load www.amd.com from within the network....come home though and i can see there's absolutely nothing wrong with that site. I know that there's definitely no strange filtering going on.

I can do an nslookup to the site and get exactly the same results at home and at work. I'm currently pointing my DNS forwarders at google (8.8.8.8 and 8.8.4.4) but there doesn't appear to be an issue with DNS.

The second issue is that i have some sites hosted internally, but people access them even while internally by using its external address. At times these sites or pages will timeout but then load instantly as soon as you refresh after the timeout, this is my biggest problem at the moment really.

Any ideas on these two? There are technical issues with our ISP at the moment but from what they tell me those issues are I don't foresee them being the cause of these two issues (well maybe the first..)

 

[leigh_boy]

the page loading issues sounds to me like dns, check your dns server for forward and reverse lookup's
do ping tests.
ns lookups.
and lastly put it in to your host file to by pass the dns to make sure its not a dns error.

 

[Nikumba]

To get round your second issue, in your DNS create a new zone for the external address with a A record pointing to the internal server

 

[mrbios]

Cheers will give those a go on Monday.

As for not being able to get to amd.com, it seems i had a setting to block proxied requests on my filtering, AMDs website must be setup differently to most because as soon as i turned that off it worked perfectly.