Epygi QuadroCS SW-Version Guia de Instalação descarregar pdf (Página 42)

QuadroCS Manual II: Administrator's Guide Administrator's Menus

QuadroCS (SW Version 3.1.x) 42

Disable CCP (Compression Control Protocol) negotiation -

this option should only be selected if the peer system is not

working properly. For example, if it is not accepting the requests

from the PPPD (Point-to-Point Daemon) for CCP negotiation.

Disable magic number negotiation - with this option, PPPD

cannot detect a looped-back line. This option should only be

selected if the peer is not working properly.

Disable protocol field compression negotiation in both the

receive and the transmit direction – with this option, no

protocol field compression will take place.

Disable Van Jacobson style TCP/IP header compression in

both the transmit and the receive direction – with this option,

no negotiation of TCP/IP header compression will take place

and the header will always be sent uncompressed.

Disable the connection-ID compression option in Van

Jacobson style TCP/IP header compression - with this

option, PPPD will not compress the connection-ID byte from

Van Jacobson and will not ask the peer to do so.

Disable the IPXCP and IPX protocols - this option should only

be selected if the peer is not working properly and cannot

handle requests from PPPD for IPXCP negotiation.

Fig. II-69: Advanced PPP Settings page

Firewall

The Firewall Configuration page allows setting up a firewall, configuring the security level of QuadroCS.

A Firewall is a security service configured by the QuadroCS administrator based on various criteria. The firewall allows or blocks traffic based on

policies, services and/or IP addresses. The firewall has several levels of security policies (low, medium, high). The administrator may add additional

service-based rules. Filtering rules will take effect only if the Firewall has been enabled and are independent from the selected firewall security level.

The Firewall Configuration page consists of the following

components:

The Enable Firewall checkbox selection enables the firewall

security service. The firewall security level has to be selected,

otherwise the firewall cannot be enabled.

The Firewall Security radio buttons are:

• Low Security - Everything that is not explicitly forbidden is

allowed. This security level doesn't block anything by

default. It is recommended if the device is already located

behind another firewall or if every filter has been configured

correctly.

• Medium Security - Traffic originating from the LAN side

may pass and traffic from the WAN side will be blocked by

default. This is the recommended security level.

• High Security - Everything that is not explicitly allowed will

be blocked, including traffic from the LAN side.

Advanced Firewall Settings link refers to page where QuadroCS

privacy can be configured.

The View Filter Rules link opens the Filtering Rules

page.

Fig. II-70: Firewall and NAT Settings page

Advanced Firewall Settings

Advanced Firewall Settings are used to deny Ping and

Portscanning operations addressed toward the device. With

these features enabled QuadroCS will answer with irritating

message to the Ping and Portscanning operations. Page

consists of the following components:

The Ping Stealth checkbox selection prohibits Ping operation

toward QuadroCS from its WAN.

The Fool Portscanner checkbox selection prohibits QuadroCS

portscanning from its WAN. As a reply to Portscanning

operation, "network unreachable" or "host unreachable"

feedback messages will be sent.

Fig. II-71: Advanced Firewall Settings page

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