Chapter 3: System planning
Security planning
Page 3-41
Figure 48 Categorical protocol filtering
The following are example situations in which the protocol filtering is configured where NAT is
disabled:
If a subscriber is blocked from only PPPoE and SNMP, then the subscriber retains access to all
other protocols and all ports.
If PPPoE, IPv4, and Uplink Broadcast are blocked, and also check the All others selection, then
only Address Resolution Protocol is not filtered.
The ports filtered as a result of protocol selections in the Protocol Filtering tab of the SM/BHS are
listed in
Table 71
.
BootP
Client
BootP
Server
SNMP
IPv4
Multica
st
User
Defined
Port 1
SMB
User
Defined
Port 3
User
Defined
Port 2
PPPoE
ARP
All
Others
All
Other
IPv4