AVM 3370 20002563 Manuel D’Utilisation

Port Forwarding: Making Computers Accessible from the Internet

FRITZ!Box 3370

43

PING

IPv4:

The FRITZ!Box responds to ping inquiries from 
the Internet addressed to the IPv4 address of the 
FRITZ!Box.

IPv6:

The FRITZ!Box responds to ping inquiries from 
the Internet addressed to the IPv6 address of the 
FRITZ!Box. Additionally, you can set up PING6 
port forwarding rules for each computer in the 
home network since each computer has its own 
globally valid IPv6 address.

TCP

UDP

IPv4:

Within IPv4 networks you can open the FRITZ!Box 
firewall for the protocols TCP and UDP when en-
tering the port range. One port can be opened for 
exactly one computer.

IPv6:

Within IPv6 networks you can open the FRITZ!Box 
firewall for the protocols TCP and UDP when en-
tering the port range. One port can be opened for 
each computer in the network.

ESP

GRE

IPv4:

Within IPv4 networks you can open the firewall 
for the two protocols ESP and GRE which do not 
use ports.

Exposed Host

(Open firewall 
completely)

IPv4:

Within IPv4 networks you can open the firewall 
for one computer completely. This computer is 
then no longer protected by the FRITZ!Box fire-
wall. If individual ports are already open for other 
computers, then data packets for these ports are 
not forwarded to the exposed host but to the oth-
er computer instead.

IPv6:

Within IPv6 networks you can open the firewall 
for each computer completely. These computers 
are then no longer protected by the FRITZ!Box 
firewall.