Cable modem link slowness w ISA570 and CLI "show tech" equivalent

Hi, I'm helping out a non profit that has a Mediacom 100mbs link, they get 90+ Speed connected directly to the cable modem, but anywhere past the ISA570 they only get 50-60mbs. They have switched cables, added a separate port, tried different PCs, results are the same, 50-60 mbs max.
Also it's their understanding the ISA570 can't do CLI, so how can they get the equivalent of a 'show tech' command to a file to send offsite for troubleshooting,
Thanks.
Jim

Hello,
There is something similar to show tech on the ISA.
Log into the web GUI, go to Device Management >> Cisco Services & Support >> Send Diagnostics. At the bottom of that page is a Download button that will collect the config file, the logs, and some debug outputs into a zip file. You can use this to troubleshoot the device, although I usually prefer to be on the live device itself to look at things.
Before you dig too deep into those however, what kind of security services do you currently have enabled on the ISA? I was looking over the datasheet and while the SPI is capable of ~500mbps, when you start to enable the various security services those speeds start to drop.
If we look at the UTM (Unified Threat Management) throughput measures, that is at about 75mbps, which is fairly close to what you are getting. I would go through and disable the various security services one at a time and test your speed. My guess would be either A/V or IPS is slowing your connection down. It may be one or a combination of these services causing the slowdown. You can disable those options, or just explain that the extra security will cost a bit of speed.
Hope that helps a bit,
Christopher Ebert - Advanced Network Support Engineer
Cisco Small Business Support Center
*please rate helpful posts*

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4. Any pointers as to how this really should be done would help. Any better ideas in setup??
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Yep, I wanted to connect them wireless but it sounds like I cant without some issues.
Second choice: Cascade-- Connect routers by Cat 5e and make the second one a WEP that has the TIVO, PS3, and the Wii connected wireless to it. The main Router would have the computers and printer connected to it. The main router would be WPA (2) protected for a wireless laptop.
Is the second choice possible??
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Hi.
I have an Arris cable modem connected to my MacBook and everything works fine but when I connect my AE everything seems go go wrong.
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Hello,
I'm probably in a little over my head thinking I could configure MacOS X Server without much IT knowledge. But I started, so I'm not giving up yet.
Here's my setup:
— cable modem ethernet connects to USB nic (the apple macbook air one) plugged into mac mini running 10.5.6 Server
— ethernet on mac mini connects to switch
— switch connects to airport base station set-up as bridge
— in the future other computers will connect over ethernet to the switch (that's why mac mini isn't plugged into base station directly)
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— cable modem uses DHCP (no fixed IP).
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— I've run the NAT setup assistant to switch the WAN and LAN nics to see if the USB Ethernet was the issue, but with the same results.
— This setup used to work although not quite stable on 10.5.4 server.
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— is the LAN DHCP messing with the WAN?
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— what am I doing wrong? Why doesn't this just work as advertised...
I know there are several of you out there that have the same setup working (I found posts from hirstey and DigiAngel with the same setup) so it must be possible. All your help is much appreciated!!
Thanks,
Hagenaer
Thanks!
Message was edited by: Hagenaer

Thanks for your reply, DigiAngel.
DSL modems differ from cable modems as far as I understand. Where DSL modems are actually routers capable of NAT/DHCP, cable modems are just a network interface/brigde and can't do any of that. So it should pass the external IP to the computer. I'm writing on a laptop with the cable modem directly plugged into it, and it picked up the external IP etc. near instantly. The mac mini did the same before I ran the NAT setup assistant. I believe it picked it up once after that, but never since.
I had done a clean install, had the ethernet plugged into its internal ethernet port (en0) and was able to download all the system updates. Then plugged in the USB ethernet, I'm pretty sure it still picked up the IP there. Ran the NAT setup assistant and can't get anything to work anymore. Even with all services switched off.
So the modem is doing its job, but when I connect it to the USB nic the connection gets a self-assigned IP in about 3 seconds after seeing the cable is connected. The one time I've seen it get the right IP, it got a self-assigned IP first and then about 5 seconds later picked up on the correct IP. (And it picked up everything, including DNS server and search domains, which this laptop I'm writing on does not, although it works just the same).
Unfortunately, this laptop runs 10.4.11 which doesn't recognize the USB nic, so I can't test the adapter outside of the server environment. But I've had the genius bar test the adapter previously and it worked fine then, plus I've run the NAT setup assistant with the connections inverted (WAN over built-in ethernet, LAN over USB ethernet) with the same results: WAN gets self-assigned IP.
I've also tried configuring manual IP for the WAN from what I saw was given to this laptop (it kept the same IP even after being disconnected/reconnected, so I guess the IP for my modem won't change IP unless I reset it. Although I'm not sure if it's correct logic to assume the mac mini would pick up the same IP as well since I think that's actually tied to the MAC address and the IP doesn't belong to the modem but to the computer behind it).
Anyway, I'm not sure what to try next...
Hm. Wait, this might have something to do with it: the firewall logs the following:
Mar 22 14:12:07 server ipfw[4997]: 65534 Deny UDP 73.227.220.1:67 255.255.255.255:68 in via en 2
Looking up 73.227.220.1 gives me dns1.inflow.pa.bo.comcast.net, clearly my provider's DNS server. Trying to get me an IP that my wirewall is denying? Turning off the firewall doesn't make it pick up the correct IP though... I have turned off all services and still just got a self-assigned IP.

Cable modem link slowness w ISA570 and CLI "show tech" equivalent

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