Avaya 3.7 Manuale Utente

WinNuke Attack. - This attack attempts to completely disable networking on computers that 
are running Windows 95 or Windows NT. This attack can be swift and crippling because it uses 
common Microsoft NetBIOS services. WinNuke attacks ports 135 to port 139 on platforms that 
are based on Windows 95 and Windows NT.

Buffer Overflow. - This attack overflows the internal buffers of the application by sending more 
traffic than the buffers can process. This attack can contain a program at the end of a packet 
which can run and attack the system.

1. To set DOS rules, from the Configure Console window, select View>Firewall. Select the 

DOS tab. 

2. Select the rules that should be enabled and select to log details about attack attempts, if the 

log function is available.

3. Click Save.

For servers running VPNos 4.2 or later, use the VoIP tab to enable or disable Voice over IP 
(VoIP) and to configure the gatekeeper properties. Definition of the gatekeeper location is with 
respect to the internal or external firewall definition. Beginning with VPNos Feature Pack 4.31, 
use the VoIP property to configure the IP trunking properties. You can add, modify, or delete IP 
trunking configurations.

Voice over IP uses the Internet Protocol to transmit voice as packets over an IP network. So 
VoIP can be achieved on any data network that uses IP (Internet, Intranets, and Local Area 
Networks). Here the voice signal is digitized, compressed and converted to IP packets and then 
transmitted over the IP network. Signaling protocols are used to set up and tear down calls, 
carry information required to locate users and negotiate capabilities. One of the main 
motivations for Internet telephone is the low cost involved.

The IP Trunking call model should be used when there is an IP Trunk configured between 
gatekeepers at separate locations and the call signaling messages (i.e. H.225 and Q.931 
packets) between those gatekeepers is NATed by the device.