User manual

EE400-R GigaFast Ethernet.
P 33
3. Block Client in LAN:
This function is used to inhibit some LAN clients (by IP address) from accessing Internet resources.
Since all LAN clients are reco
g
nized b
y
thei
r
IP addresses, re
g
ardless of if the LAN client’s IP
address is assi
g
ned b
y
DHCP server or manual settin
g
, this function alwa
y
s works well.
4. Filter Packets from LAN:
This function allows the administrator to inhibit LAN users from using some Internet services for
mana
g
ement purposes.
For example, if the EE400-R is used in a SOHO environment and the administrator wants to inhibit
LAN users from usin
g
Telnet services
(
like BBS, on-line chat
)
, then it is easil
y
achieved b
y
blockin
g
all packets to service port 23.
Another example would be blocking service port 110 (POP3) which will inhibit LAN users from
checking/retrieving outside Internet E-Mail accounts. This is very useful when WAN connection
type is Dial-On-Demand (like PPPoE/PPP). Then, the EE400-R can auto-disconnect at normal
conditions. Otherwise the periodic E-Mail checkin
g
will cause the EE400-R to keep the WAN
connection alive forever. Therefore, in this situation, the LAN user can onl
y
use E-Mail servers
inside the network. (if a POP3 server exists in the LAN).
4.2 Service Time Allocation