RE: ISA has slowed down
- From: "William Robertson" <robertson.william@xxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Fri, 26 Sep 2003 12:10:28 +0200
Hi Sachin
I would think that if you have forced the clients to use a LAN Proxy and it
now appears faster, this could maybe be due to DNS. I won't even attempt to
go into the serious workings of DNS, IE and ISA, but my own opinion is that
there is some serious interaction between these 3.
Anyway, my thinking is that you may have some serious saturation on your
outbound link that could be placing a large load on your DNS Servers
(possibly as a result of some infection), this means that by placing the LAN
Proxy settings in IE you could be alleviating that step in the WEB-surfing
process as the clients no longer need to query.
The bottom line is that I had a similar problem wherein some of my client
workstations were infected with Nachi and the then initiated MANY outbound
ICMP echo requests and this really brought down my link.
I would suggest that you check your FIREWALK log and try and spot the IP
Addresses of your internal clients that appear "with repeated frequency".
This is how I managed to identify the workstations that were infected on my
network.
Cheers
William R.
-----Original Message-----
From: sachin vaish [mailto:sachin.vaish@xxxxxxxxxx]
Sent: 26 September 2003 10:45 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: ISA has slowed down
http://www.ISAserver.org
HI
We have had ISA Server 2000 running for around 7 months with no trouble at
all. We know we have set this up correctly and are happy with th way it
has been running with around 50 users. Since August 2003 we have added
around 150 users, bring the total number of users up to 200 users.
Everything has been running fine since, up until 5 days ago. All the users
have seen a massive slowdown in internet speed. We have an 8MB line to the
internet so we know its not lack of bandwidth, even though we have heavy
web traffic. We were very confused because another one of our sites which
is much smaller had exactly the problem at the same time, but thismay just
be a coincidence. Since then we have found that making the users install a
firewall client and asking them to enable "Use a proxy server for your
LAN", in LAN Settings under Internet options has improved the speed of the
internet dramatically bringing the services back to normal.
Our ISA setup is basic, as we are not in a corporate network. So there is
no domain, etc. But our ISA config is a little more complex, with MSN and
KAzaa enabled but restricted to useonly a percentage of the bandwidth, but
i dont see this as the problem as it has always been there and has been
used.
Can anyone shed light on what can be causing the problem?
Regards
Sachin
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