IPS 4240 seems to be dropping legitimate packets

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Sep 4th, 2008
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I have an IPS 4240 installed in between my customers Outside Firewall and his Internet Router.

I have been receiving excessive Alarms from the IPS with respect to a match on signature ID:1300/0. This is allegedly a TCP Segment Overright. The addresses are the addresses of a DNS server provided by our ISP, and then our Front End Mail Server in our DMZ. Is this most likely a false positive, or is it a crafted packet that could be an attack?

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Farrukh Haroon Sat, 09/06/2008 - 23:38
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We see this signature fire all the time for hosts about whom we are sure that they are not HaX0RiNG our network :)


Regards


Farrukh

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