Manual Lancom L-320agn Wireless (page 53 of 97) (English)

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LANCOM L-32x Access Point series

 Chapter 4: Security settings

 Have you activated the firewall?

The stateful inspection firewall of LANCOM devices ensures that you local

network cannot be attacked from the outside. Activate the firewall in

LANconfig under 'Firewall/QoS' on the 'General' tab.



Note that firewall security mechanisms (incl. IP masquerading, port

filters, access lists) are active only for data connections that are trans-

mitted via the IP router. Direct data connections via the bridge are not

protected by the firewall!

 Are you using a 'deny all' firewall strategy?

Maximum security and control is initially achieved by denying all data

traffic from passing the firewall. The only connections to be accepted by

the firewall are those that are to be explicitly permitted. This ensures that

Trojan horses and certain types of e-mail virus are denied communication

to the outside. Activate the firewall rules in LANconfig under 'Firewall/

QoS' on the 'Rules' tab. Instructions on this are to be found in the refe-

rence manual.

 Have you activated IP masquerading?

IP masquerading refers to the concealment of local computers while they

access the Internet. All that is revealed to the Internet is the IP number of

the router module of the device. The IP address can be fixed or dynami-

cally assigned by the provider. The computers in the LAN then use the rou-

ter as a gateway and are not visible themselves. The router separates the

Internet from the intranet like a wall. The application of IP masquerading

is set in the routing table for every route individually. The routing table can

be found in the LANconfig in the configuration area 'IP router' on the

'Routing' tab.

 Have you used filters to close critical ports?

The firewall filters in LANCOM devices offer filter functions for individual

computers or entire networks. It is possible to set up source and destina-

tion filters for individual ports or port ranges. Furthermore, filters can be

set for individual protocols or any combination of protocols (TCP/UDP/

ICMP). It is especially convenient to set up the filters with the aid of

LANconfig. Under 'Firewall/QoS', the 'Rules' tab contains the functions for

defining and editing filter rules.

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Lancom L-320agn Wireless Manual

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