Billion BiPAC 7404V series User Manual page 46

Connection:
Always on: If you want the router to establish a PPPoA session when starting up and to
automatically re-establish the PPPoA session when disconnected by the ISP.
Connect to Demand: If you want to establish a PPPoA session only when there is a packet
requesting access to the Internet (i.e. when a program on your computer attempts to access the
Internet).
Idle Timeout: Auto-disconnect the broadband firewall gateway when there is no activity on the
line for a predetermined period of time.
Detail: You can define the destination port and packet type (TCP/UDP) without checking by
timer. It allows you to set which outgoing traffic will not trigger and reset the idle timer.
RIP: RIP v1, RIP v2, and RIP v2 Multicast. Check to enable RIP function.
MTU: Maximum Transmission Unit. The size of the largest datagram (excluding media-specific
headers) that IP will attempt to send through the interface.
TCP MSS Clamp: It is enabled by default. All TCP traffic routed through the interface will be
examined. If a TCP SYN (synchronize/start) segment is sent with a maximum segment size larger
than the interface MTU (Maximum Transmission Unit), the MSS option will be rewritten in order to
allow TCP traffic to pass through the interface without requiring fragmentation.
Advanced Options (PPPoA)
LLC Header: Selects encapsulation mode, true for using LLC or false for using VC-Mux.
Create Route: This setting specifies whether a route is added to the system after IPCP (Internet
Protocol Control Protocol) negotiation is completed. If set to enabled, a route will be created which
directs packets to the remote end of the PPP link.
Specific Route: Specifies whether the route created when a PPP link comes up is a specific or
default route. If set to enabled, the route created will only apply to packets for the subnet at the
remote end of the PPP link. The address of this subnet is obtained during IPCP negotiation.
Subnet Mask: sets the subnet mask used for the local IP interface connected to the PPP transport.
If the value 0.0.0.0 is supplied, the netmask will be calculated from the class of the IP address
obtained during IPCP negotiation.
Route Mask: Sets the subnet mask used by the route that is created when a PPP link comes up. If
it is set to 0.0.0.0, the subnet mask is determined by the IP address of the remote end of the link.
The class of the IP address is obtained during IPCP (Internet Protocol Control Protocol) negotiation.
MRU: Maximum Receive Unit. This is negotiated during the LCP protocol stage.
Discover Primary / Secondary DNS: This setting enables/disables whether the primary/secondary
DNS server address is requested from a remote PPP peer using IPCP. The default setting for this
command is enabled.
Give DNSto Relay: Controls whether the PPP Internet Protocol Control Protocol (IPCP) can
request the DNS server IP address for a remote PPP peer. Once IPCP has discovered the DNS
server IP address, it automatically gives the address to the local DNS relay so that a connection
can be established.
Give DNSto Client: Controls whether the PPP Internet Protocol Control Protocol (IPCP) can
request a DNS server IP address for a remote PPP peer. Once IPCP has discovered the DNS
Chapter 4:Configuration
VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
45