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Internet connection / performance problems

This is a rather generalised question, but wondered if anyone could point me in the right direction. We have a single Windows 2003 standard server, running exchange, connected to the internet via a router and seperate physical firewall.
We are experiencing perfomance issues where the connection speed is much reduced or not there at all. We have asked the ISP to check their connection, and they assure us that there is no problem here, and we have also asked our telecoms company to test the line, and they also tell us things are OK.
Does anyone have any tips on trouble shooting procedures for this kind of problem?
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nigelbeatson
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nigelbeatson
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1 Solution
 
rsivanandanCommented:
how is the cpu performing on both the router and firewall ? Have you checked that ? If the connection is too much then you can find it out from there.

Cheers,
Rajesh
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nigelbeatsonAuthor Commented:
sorry for sounding dim, but how do we check this? Is there usually some kind of monitor on the router and firewall?
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rsivanandanCommented:
What make are they ?

Cheers,
Rajesh
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nigelbeatsonAuthor Commented:
The firewall is a rather old Watchguard SOHO unit and the adsl modem router is a netgear DG834g.
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rsivanandanCommented:
so I assume both are configuring using some web ui and most probably they won't have statistics of performance. Hmmm...

At peak hours if you go to dsl-reports or auditmypc.com, how much is the bandwidth ? As well, do an analysis on off-hours to see what is the bandwidth. If they're same then there is a problem with ISP otherwise the load is from the network itself.

Cheers,
Rajesh
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nigelbeatsonAuthor Commented:
I will provide the information when I go on site tomorrow. Thanks for your assistance.
Our customer has also just installed the netgear DG834G themselves in an attempt to resolve this issue. They tell me that it seemed to help at first, but now its back to the same poor perfromance.
Do they really need both the Netgear and the Watchguard Firewall? Does the Netgear not already have a firewall built in?
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rsivanandanCommented:
Security

    * Firewall: Stateful Packet Inspection (SPI), Intrusion logging and reporting, Denial of Service (DoS) protection VPN Functionality: Supports up to 5 IPSec VPN end points; NAT traversal (VPN passthrough) for IPSec, PPTP and L2TP VPNs
    * Mode of Operation: Network Address Translation (NAT), static routing
    * IP Address Assignment: Static IP address assignment, internal DHCP server on LAN, DHCP client on WAN


The above is what I can see for this product, so I really don't see the purpose of having 2 firewalls.

Cheers,
Rajesh
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nigelbeatsonAuthor Commented:
I can add some additional information now that I am actually here on site. We found that last night, one of our workstations was consuming 100% of the CPU capacity. We disconnected the workstation form the network, and the internet connection improved dramitically straight away.
I have returned this morning, and re connected the workstation, and the CPU rate is back to normal at the moment and the Internet connection is working fine.
I feel that this will keep happening as this problem has been on and off for a few weeks now. Could somone be using this particular workstation / user illegally, hijacking this account? If so what would we do about it? Would changing the user password do the trick?
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rsivanandanCommented:
Very probable. Couple of things to be done.

1. Download adaware (www.lavasoftusa.com) and do a thorough check.

2. Hope your antivirus software is up to date.

3. Go to www.hijackthis.de and download the software. Run it, copy the output and paste it in www.hijackthis.de itself for analysis and provide the link here for me to take a look at it.

Cheers,
Rajesh
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nigelbeatsonAuthor Commented:
The workstation was infested with spyware etc. Have cleared it down, and at the moment everything seems to be OK.

Thanks for your help.
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rsivanandanCommented:
No problem. Work towards have a centralized antispam appliance or software.

Cheers,
Rajesh
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