Barracuda Networks NG Network Access Client SP4 Administrator's Manual page 52

List 3–6 Barracuda NG Network Access Client
Parameter
ICMP Parameters
Connect to the Internet
with ADSL (PPTP)
Table 3–3
Services and protocols employed by the ADSL rule
Port Protocol
GRE
1723 TCP
50 Server Config – Personal Firewall Rules
Description
This tab allows you to configure blocking of ICMP packets.
Setting to yes creates a pass rule named ADSL in the Outgoing tab of the firewall configuration that is needed for Internet
connections via ADSL.
The service object used in this rule amongst others implements the services and protocols listed in table 3–3, page 50.
Service Name Description
pptp Generic Routing Encapsulation; protocol which allows an arbitrary network protocol A to be
transmitted over any other arbitrary network protocol B, by encapsulating the packets of A within
GRE packets, which in turn are contained within packets of B
NETBIOS-DGM Point-to-Point tunnelling protocol; control port