Re: Slow Browsing Internet

CAMC1 wrote:
What I need is a good device or software that will detect such abnormal
behaviour on my LAN, and flag me for it.
So that I can go to that device and look at it.

I know I can put packet sniffer, but sniffing packets and trying to
interpret what they mean is another game.
MC

"James Beukelman" <james978@xxxxxxxxx> wrote in message
news:%23KBKYQmoHHA.4192@xxxxxxxxxxxxxxxxxxxxxxx
CAMC1 wrote:
Can anyone suggest a solution to problem below?

- From time to time, browsing internet from our LAN is really slow, and
opening any pages time out from any websites
- Browsing internet from outside firewall seem ok
- 2 windows Active Directory 2000 DC with DNS, DHCP and WINS enabled
completely patched.
- In our internal network, some windows 98, and NT4 workstations that
can't
be patched and old Anti-Virus may not be working correctly
but they have to be on the LAN, and upgrade costs would be huge.
I know, one of these PC could be acting like zombie inside which may be
slowing down web browsing.
When we re-boot 2 DC fresh, browsing problem goes away, a few days.

Do you think, having another DNS sever would solve our problem?
How would I know if DNS server bogged down when there is no apparant
indication?

Thanks
MC


Chances are that it is not related to DNS. I would guess you may have a
virus that is trying to phone home. Or it could possibly be a broadcast
storm on your network.

In either of these scenarios, one host on your network could be sending
large amounts of data, flooding your LAN.

If this is the case, it's easy to determine which host it is.. though it
will take some time, so clear your afternoon schedule!

Easiest way is to take your laptop (hopefully you have one) and plug it
into your network switch. Do this when the Internet is running slowly.
Then, one by one, unplug each device from the switch and try to surf
the internet again from your laptop. If it's still slow, plug it back
in and move on the the next one. If the Internet moves faster, you now
know where the problem lies.

Good Luck



DNS is one of those things that either works or it doesn't. It won't work fine and then gently degrade over time.

Yes, you could use a sniffer, but those mainly show you WHAT type of traffic your network carries, but it won't really measure, per port, the amount of bandwidth.

I'm hoping that with all those switches, that they are manageable? Do you have Cisco's or HP's or something else like that? There might be some statistics you could gather from the switches. They usually have per port packet accounting.
.

Relevant Pages

  • Re: Non-domain connection problem
    ... For some reason the DNS is persistent. ... connect new PC to the internet from the non-domain network: ... In server 2000 gpoedit.msc showed them but in SBS it is different. ...
    (microsoft.public.windows.server.sbs)
  • Re: Non-domain connection problem
    ... You said that you "hard coded the DNS server to a known DNS on the internet: ... Connect to Internet from Internal Network ... NSLOOKUP always looks for the SBS as the default gateway. ...
    (microsoft.public.windows.server.sbs)
  • Re: ISA 2006 Basic Configuration
    ... Why would we point Preferred DNS to itself? ... Configuring the Internal Network Interface ... In the Internet Protocol Properties dialog box, ... Select the Use the following DNS server addresses option. ...
    (microsoft.public.isa.configuration)
  • Re: IE cant connect to any sites
    ... On the General tab in the Temporary Internet Files Folder, ... Click on "LAN Settings" and make sure everything is blank, ... Network settings ... IP address automatically", click on the DNS tab, disable DNS here, click ...
    (microsoft.public.windows.inetexplorer.ie6.browser)
  • Re: sasser virus; now I get page error every time I try to access the web and fail
    ... On the General tab in the Temporary Internet Files Folder, ... Click on "LAN Settings" and make sure everything is blank, ... Network settings ... IP address automatically", click on the DNS tab, disable DNS here, click ...
    (microsoft.public.windows.inetexplorer.ie6.browser)