Telewell TW-EA510v4 Router Manual PDF (Setup & Configuration Guide)

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TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router

Chapter 4: Configuration

60

Packet Filter – Add Raw IP Filter

Rule Name:

Users-define description to identify this entry or click

to select existing

predefined rules.

Time Schedule:

It is self-defined time period.

You may specify a time schedule for your prioritization

policy. For setup and detail, refer to

Time Schedule

section

Protocol Number:

Insert the port number, i.e. GRE 47.

Inbound / Outbound:

Select

Allow

or

Block

the access to the Internet (

“Outbound”

) or from the

Internet (

“Inbound”

).

Click

Apply

button to apply your changes.

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TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router

Chapter 4: Configuration

61

Example: Configuring your firewall to allow for a publicly accessible web server on your LAN

The predefined port filter rule for HTTP (TCP port 80) is the same no matter whether the firewall is set to

a high, medium or low security level. To setup a web server located on the local network when the

firewall is enabled, you have to configure the Port Filters setting for HTTP.

As you can see from the diagram below, when the firewall is enabled with one of the three presets

(Low/Medium/High), inbound HTTP access is not allowed which means remote access through HTTP to

your router is not allowed.

Note:

Inbound indicates accessing from Internet to LAN and Outbound is from LAN to the Internet.

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TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router

Chapter 4: Configuration

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Configuring Packet Filter:

1. Click

Packet Filter

. You will then be presented with the predefined port filter rules screen (in this case

for the low security level), shown below:

Note

:

You may click Edit the predefined rule instead of Delete it.

This is an example to show to how you add a

filter on your own.

2. Click

Delete

to delete the existing HTTP rule.

3. Click

Add TCP/UDP Filter

.

4. Input the Rule Name, Time Schedule, Source/Destination IP, Type, Source/Destination Port, Inbound

and Outbound.

Example:

Application:

Cindy_HTTP

Time Schedule:

Always On

Source / Destination IP Address(es):

0.0.0.0

(I do not wish to active the address-filter, instead I

use the port-filter)

Type:

TCP (Please refer to Table1: Predefined Port Filter)

Source Port:

0-65535

(I allow all ports to connect with the application))

Redirect Port:

80-80

(This is Port defined for HTTP)

Inbound / Outbound:

Allow

Click Add TCP/UDP Filter

Click Delete

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TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router

Chapter 4: Configuration

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5. The new port filter rule for HTTP is shown below:

6. Configure your Virtual Server (“port forwarding”) settings so that incoming HTTP requests on port 80

will be forwarded to the PC running your web server:

Note:

For how to configure the HTTP in Virtual Server, go to Add Virtual Server in Virtual Server section for more

details

.

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TW-EA510 version 4 ADSL2+, WLAN 802.11g, VPN, Firewall Router

Chapter 4: Configuration

64

Intrusion Detection

The router’s

Intrusion Detection System

(IDS) is used to detect hacker attacks and intrusion attempts

from the Internet. If the IDS function of the firewall is enabled, inbound packets are filtered and blocked

depending on whether they are detected as possible hacker attacks, intrusion attempts or other

connections that the router determines to be suspicious.

Blacklist

: If the router detects a possible attack, the source IP or destination IP address will be added to

the Blacklist. Any further attempts using this IP address will be blocked for the time period specified as

the

Block Duration

. The default setting for this function is false (disabled). Some attack types are

denied immediately without using the Blacklist function, such as

Land attack

and

Echo/CharGen scan

.

Intrusion Detection

: If enabled, IDS will block Smurf attack attempts. Default is false.

Block Duration:

±

Victim Protection Block Duration

: This is the duration for blocking

Smurf

attacks. Default value

is 600 seconds.

±

Scan Attack Block Duration

: This is the duration for blocking hosts that attempt a possible

Scan attack. Scan attack types include

X’mas scan, IMAP SYN/FIN scan

and similar attempts.

Default value is 86400 seconds.

±

DoS Attack Block Duration

: This is the duration for blocking hosts that attempt a possible

Denial of Service (DoS) attack. Possible DoS attacks this attempts to block include

Ascend Kill

and

WinNuke

. Default value is 1800 seconds.

Max TCP Open Handshaking Count

: This is a threshold value to decide whether a

SYN Flood

attempt

is occurring or not. Default value is 100 TCP SYN per seconds.

Max PING Count

: This is a threshold value to decide whether an

ICMP Echo Storm

is occurring or not.

Default value is 15 ICMP Echo Requests (PING) per second.

Max ICMP Count

: This is a threshold to decide whether an

ICMP flood

is occurring or not. Default value

is 100 ICMP packets per seconds except ICMP Echo Requests (PING).

For

SYN Flood

,

ICMP Echo Storm

and

ICMP flood

, IDS will just warn the user in the Event Log. It

cannot protect against such attacks.

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