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Slow Internet - 24.Oct.2006 9:13:35 PM

MBayliss

Posts: 12
Joined: 11.Nov.2005
Status: offline

Hey Everyone,

I have just migrated to ISA 2006 using two network cards from ISA 2004 using single NIC. Since then internet access has been really slow for all users. I have rules to allow only HTTP/s. The ISA server sits behind a PIX firewall due for site to site VPN.

What is the best way to troubleshoot or monitor this?

Cheers,

Mark

Post #: 1

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RE: Slow Internet - 25.Oct.2006 8:11:25 AM

tshinder

Posts: 47659
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi Mark,

Most likely either a DNS issue, or you need to hard code your NICs to the correct speed.

Another possibilty is MTU and another possbility is that PMTU Discovery isn't enabled.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.
Sr. Consultant/Technical Writer
Prowess Consulting http://www.prowessconsulting.com/
Blog: http://blogs.isaserver.org/shinder/

GET THE NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8

(in reply to MBayliss)

Post #: 2

RE: Slow Internet - 30.Oct.2006 6:45:56 PM

MBayliss

Posts: 12
Joined: 11.Nov.2005
Status: offline

Thanks Tom,

Much appreicate your swift response. I have hard code both internal/external network cards and enable PMTU. The internet is slightly faster.

I have looking at upgrading our lines to a faster connection.

Cheers,

Mark

(in reply to tshinder)

Post #: 3

RE: Slow Internet - 31.Oct.2006 8:00:43 AM

tshinder

Posts: 47659
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi Mark,

If there is any slowness due to the ISA, then it could be a DNS issue. Check that out.

Tom

_____________________________

Thomas W Shinder, M.D.
Sr. Consultant/Technical Writer
Prowess Consulting http://www.prowessconsulting.com/
Blog: http://blogs.isaserver.org/shinder/

GET THE NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8

(in reply to MBayliss)

Post #: 4

RE: Slow Internet - 2.Nov.2006 6:30:18 PM

cylent

Posts: 10
Joined: 2.Nov.2006
Status: offline

i am wondering where this pmtu value is and how i can change it

is this the correct article?

http://support.microsoft.com/kb/902347

i did this:
How to create the ICMP protocol at the enterprise level

loadTOCNode(3, 'resolution');

1.
Click Start, point to Programs, point to Microsoft ISA Server, and then click ISA Server Management.

2.
In the left pane, expand Enterprise, and then click Enterprise Policies.

3.
In the task pane, click the Toolbox tab, and then click Protocols.

4.
Under Protocols, click New, and then click Protocol.

5.
In the Protocol definition name box, type ICMP MTU Discovery, and then click Next.

6.
Click New, and then click ICMP in the Protocol type list.

7.
Type 4 in the ICMP Code box, type 3 in the ICMP Type box, and then click OK.

8.
Click Next, click Finish, and then click Apply.

and i have this:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\EnablePMTUDiscovery
Value is at 1

correct?

< Message edited by cylent -- 2.Nov.2006 6:33:33 PM >

(in reply to MBayliss)

Post #: 5