Planet Technology G.SHDSL.bis Bridge Router GRT-504 - Manual (Page 146)

GRT-504 4-Wire G.SHDSL.bis Firewall Router User’s Manual
7.12.11 Firewall
7.12.11.1 Firewall security level
The product supports advanced firewall. To setup the advanced firewall, you can use firewall to
configure.
>> Level
Configure firewall security level
pkt_filter Configure packet filter
dos_protect Configure DoS protect
There are three level of firewall, which you can setup in this product.
Level one, basic, only enables the NAT firewall and the remote management security. The NAT
firewall will take effect if NAT function is enabled. The remote management security is default to
block any WAN side connection to the device. Non-empty legal IP pool in ADMIN will block all
remote management connection except those IPs specified in the pool.
Level two, automatic, enables basic firewall security, all DoS protection, and the SPI filter
function.
Level three, advanced, is an advanced level of firewall where user can determine the security
level for special purpose, environment, and applications by configuring the DoS protection and
defining an extra packet filter with higher priority than the default SPI filter. Note that, an improper
filter policy may degrade the capability of the firewall and/or even block the normal network traffic.
The firewall security level can configure via level command.
7.12.11.2 Packet Filtering
Packet filtering function can be configured by pkt_filter command. Move the cursor to pkt_filter
and press enter.
>> active
Trigger packet filtering function
drop_flag Drop fragmented packets
Add Add packet filtering rule
Delete Delete packet filtering rule
Modify Modify packet filtering rule
Exchange Exchange the filtering rules
list Show packet filtering table
Command Description
Active Enable packet filtering function
Drop_flag Enable drop fragmented packets function
Add Add packet filtering rule
Delete Delete packet filtering rule
Modify Modify packet filtering rules
Exchange Exchange the filtering rules
List Show all the packet filtering table
Add the packet filtering rule via add command.
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