Excito B3, User Manual

Page: 58 / 154

58
B3asrouterandfirewall
B3
as router and firewall
Replace your old router with B3! Using B3 as your router and firewall is the best
and simplest way for you to reach your content on B3 from the Internet. The
firewall is pre-configured to fit most peoples needs, but is easy reconfigured.
Note that B3 does not include a DSL modem. If your old router has a built in
DSL modem you can not replace that router with B3. If this is the case, connect
B3 as a server in your network. Se chapter “Server mode” on page 7
r
outer
The router functionality in B3 determines the next network point to which a
packet should be forwarded toward. Network devices on the LAN side of B3
will be given IP-addresses from the built in DHCP server. Connect a switch in
B3s LAN port to be able to connect several computers or other network de-
vices via cable. A description about the router settings is found in chapter “Net-
work” on page 35.
nat
Network Address Translation (NAT) is the process of modifying network ad-
dress information while the traffic is passing through the router. The purpose
is to remap a given address space into another. By doing this the internal net-
work devices (LAN) are hidden from the external network (WAN).
f
irewall
A firewall protects your home computers from attacks from the outside, by
blocking traffic that is not directly requested from the inside. B3 has this func-
tionality. You find a description of B3’s firewall features in chapter “Firewall” on
page 40.
a
llow eXternal
(wan)
aCCess to
B3
serviCes
By enabling and disabling these settings in the firewall, you are able to open
standard ports in an convenient way.