Securing ISG

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Nov 24th, 2009
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We are an ISP , we are using a 7206VXR Router as our ISG which is working with Broadhop SME. For last few days we are facing a problem  in the ISG - the error message is continiously scrolling up called " Portbundle depleted. No Portbundle can be allocated. " - as a result we were facing a various problems in our network like subscribers cannot log in or logout. However we have incremented number of loopbacks in ISG  and increased the number of Portbundles . After auditing the network it was found that there is some kind of mal- application which was intentionally filling up the free portbundles.

My question is - is there any kind of security measures - may it be an external firewal or ACL written in the ISG itself which will be used to protect ISG from external threats ?

Any suggestion is welcome.


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chrmar Fri, 12/04/2009 - 14:22
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So are you also having the issue of a large number of subscribers?  Is any subscriber authentication/authorization being done?

sneema Fri, 02/18/2011 - 16:13
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You might also placing appropriate ACLs and place your customers and other equipment in separate VRFs


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