Zoom ADSL Modem/Gateway
From: Jennifer (jbelle_at_e1vitria.com)
Date: 12/09/04
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Date: Thu, 9 Dec 2004 09:25:16 -0600
Thanks in advance for the help....
I've been running a simple DSL-based home network with a basic DSL modem
running into a Linksys router supporting 5 PC's - some Linux, some Windows.
With that configuration, I've always been able to run nmap, or any other
port scanner, at standard speed (normal) settings. We routinely will
perform full scans against our outside client's networks - typically 35-40
IP's at a time.
We've never had a problem with that scan traffic interfering with Internet
activities (web surfing, etc) on the other machines in our network.
Now, in the interest of consolidating devices, we purchased a Zoom ADSL
Gateway (5554) and replaced the modem and Linksys router. Everything works
fine in normal traffic periods, however, whenever we attempt to run an nmap
scan at anything above the -T1 "sneaky" setting, Internet access across the
network for all other machines grinds to a halt.
I can't believe that a higher end gateway can't handle traffic that a basic
modem/Linksys router can. I can find no settings or information related to
any maximum number of connections or seesions that are supported by the
gateway. Zoom tech support also confirmed that it shouldn't be an issue.
Also, the unit only supports logging for system events and not for
incoming/outgoing connections so I can't get any visibility into what's
going on.
Nmap is not sending out that much traffic, so is there anything else I'm
missing? I'm about to return the Zoom and invest in a Netopia or something
else more robust, but want to make sure I don't run into this issue again.
Thanks -
J
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