Re: Zoom ADSL Modem/Gateway

From: donnie (donnie_at_queyosepa.net)
Date: 12/09/04 

Date: Thu, 09 Dec 2004 17:03:08 GMT

On Thu, 9 Dec 2004 09:25:16 -0600, "Jennifer" <jbelle@e1vitria.com>
wrote:

>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
>
#########################
Am I correct to assume that there are no problems when nmap is used in
any other mode? My guess is, it's causing a buffer overflow in the
Zoom product. Try other port scanners to see what happens.
donnie.

Relevant Pages

  • Re: Zoom ADSL Modem/Gateway
    ... >I've been running a simple DSL-based home network with a basic DSL modem ... on the other machines in our network. ... >fine in normal traffic periods, however, whenever we attempt to run an nmap ... Zoom tech support also confirmed that it shouldn't be an issue. ...
    (comp.security.firewalls)
  • Re: Zoom ADSL Modem/Gateway
    ... >I've been running a simple DSL-based home network with a basic DSL modem ... on the other machines in our network. ... >fine in normal traffic periods, however, whenever we attempt to run an nmap ... Zoom tech support also confirmed that it shouldn't be an issue. ...
    (alt.computer.security)
  • Re: Zoom ADSL Modem/Gateway
    ... >I've been running a simple DSL-based home network with a basic DSL modem ... on the other machines in our network. ... >fine in normal traffic periods, however, whenever we attempt to run an nmap ... Zoom tech support also confirmed that it shouldn't be an issue. ...
    (comp.os.linux.networking)
  • RE: Nmap output
    ... Try using Nlog. ... NLog is a set of PERL scripts for managing and analyzing your nmap 2.0+ ... web based service gateway to an internal network. ...
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  • Re: Scanning Class A network
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