nessus 3.0 and hping in scan, inconsistent results

This is the scenario; I use hping to perform my host enumeration. I use
select tcp and udp ports. This way I will potentially find hosts behind
firewalls. I then use nmap for service identification. I then feed the
nmap results into nessus using the nmap nasl wrapper. In the nessus
config I disabled all other port scanning options other than the nmap
nasl wrapper. I get back proper nessus results for hosts that are not
behind a firewall. For hosts that are behind a firewall I get back
nothing from nessus. The report says that the host is not even up???? If
nmap comes back with port 80 and 22 open on a host that is behind a
firewall, why would nessus come back with a blank report that says the
host is not alive? Why isn't it running the port 80 and 22 pluggins
against that host?

 

Daniel Pinsky, CISSP, CCSE

 

 

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