DDJ said:
We have ADSL.
Ran the provided test. Although the Win2000 box I was using did not have an
MTU value in the registry, I added. Per the MTU test, the optimal setting
would be 1404. NOTE: that this is the setting in our firewall as well (says
something about "fragment outbound packets larger than 1404")
The browser does not have an proxy settings in place.
Tested browser after adding MTU value...still doesn't work. The firewall
forwards packets to the router, do routers generally provide for an MTU
setting?
Thanks!
Actually 1404 is really awfully low. The definition of an MTU is the actual
TCP packet size. The largest possible TCP packet size is 1500 bytes. ADSL
using PPPoE lowers the MTU to 1492, using up 8 bytes for the PPPoE overhead.
So 1492 is the common one I've seen it drop lower, depending on the ADSL
modem. The router will accomodate the modem. The lower it is, the more
difficulty there will be with IE and browsing.
What type of modem do you have?
What type of router do you have that is connected to the modem?
I was trying to re-read your previous response, but I apogize that I am
getting lost in your terminology. Here's what you previously posted:
======================
Each box is pointed to a firewall as the gateway
(192.168.168.1) and to the DC as the DNS Server
(192.168.168.187). The DC points to the ISP-provided two
DNS servers. The common firewall gateway (192.168.168.1)
forwards to the router (192.168.168.2) which forwards to
the ISP's router.
======================
Now this part (the paragraph below) is the part I really do not understand
because of the IP addresses that are mentioned, hence my previous thought
you were "arping" packets across an OpenBSD bridged firewall, which I know
not too many people use or know how to setup.
....
"The common firewall gateway (192.168.168.1)
forwards to the router (192.168.168.2) which forwards to
the ISP's router."
....
Now, let's break this down. Your 'firewall' is also your router? What brand
is it?
That "common firewall gateway (192.168.168.1) you mention, is that the above
firewall/router? Or are you saing that the firewall gateway and the router
are two different things? Or is the router actually an ADSL modem?
From the way you described that, it seems like that the 'common firewall
gateway with an IP of 192.168.168.1, which is connected to your internal
subnet, which your internal subnet uses as a gateway, has its other
interface (which by definition of a 'router') configured wtih an IP on the
same subnet and is connected to your ISP's router with an IP on the same
subnet as the internal subnet, but should be a totally different subnet. So
based on the terminology used, I am completey lost on how this is
configured.
Can you break that down for me?
What name brand router?
What name brand firewall?
What name brand modem (if it is)?
--
Regards,
Ace
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Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft Windows MVP - Windows Server - Directory Services
Security Is Like An Onion, It Has Layers
HAM AND EGGS: A day's work for a chicken;
A lifetime commitment for a pig.
