Draytek Vigor300B, User Manual

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Vigor300B Series User’s Guide 91
4 4 . . 3 3 . . 4 4 S S I I P P A A L L G G
SIP ALG means Session Initiation Protocol, Application Layer Gateway . This page
allows you to choose LAN and WAN profiles to make SIP message and RTP packets of
voice being transmitting and receiving correctly via NAT by Vigor router.
Available parameters are listed as follows:
Item Description
Enable This Profile
Check the box to enable the Mirror function for the switch.
LAN Interface Choose one of the LAN profiles.
WAN Interface Choose one of the WAN profiles.
Refresh Renew current web page.
Apply Click it to save the settings.
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The firewall controls the allowance and denial of packets through the router.
The
Firewall Setup in the Vigor300B mainly consists of packet filtering, Denial of Service (DoS)
and URL (Universal Resource Locator) content filtering facilities. These firewall filters help
to protect your local network against attack from outsiders. A firewall also provides a way of
restricting users on the local network from accessing inappropriate Internet content and can
filter out specific packets, which may trigger unexpected outgoing connection such as a
Trojan.
The following sections will explain how to configure the Firewall . Users can select IP Filter ,
DoS Defense, MAC Block and Port Block options from Firewall menu. The DoS Defense
facility can detect and mitigate the DoS attacks.