Quadro Quadro16xi Installation Guide download pdf (Page 117)

Quadro Manual II: Administrator's Guide Administrator’s Menus

Quadro2x, 2xi, Quadro4x, 4xi, Quadro16x, 16xi; (SW Version 5.2.x) 116

Advanced PPP Settings

The Advanced PPP Settings are used to enable/disable certain parts of the negotiation process during connection establishment. These settings

are available only if Quadro has a PPPoE WAN interface.

Attention: Disabling any of the services below may cause problems when establishing a connection including the complete connection failure. The

default settings should be changed only if the ISP (Internet Service Provider) specifically requires it or if the peer system has problems with one of

the services listed below. More information about these services can be found at: http://www.protocols.com/pbook/ppp.htm.

The Advanced PPP Settings page offers the following group of checkboxes:

Enable automatic PPP restart at checkbox is used to select the time when the PPP connection will automatically be restarted. The checkbox

selection enables LCP echo failures text field that indicates the number of the LCP echo failure packets received before the PPP connection will be

considered as dead and will be restarted.

Disable CCP (Compression Control Protocol) negotiation -

this option should only be selected if the peer system is not

working properly. For example, if it is not accepting the requests

from the PPPD (Point-to-Point Daemon) for CCP negotiation.

Disable magic number negotiation - with this option, PPPD

cannot detect a looped-back line. This option should only be

selected if the peer is not working properly.

Disable protocol field compression negotiation in both the

receive and the transmit direction – with this option, no

protocol field compression will take place.

Disable Van Jacobson style TCP/IP header compression in

both the transmit and the receive direction – with this option,

no negotiation of TCP/IP header compression will take place

and the header will always be sent uncompressed.

Disable the connection-ID compression option in Van

Jacobson style TCP/IP header compression - with this

option, PPPD will not compress the connection-ID byte from

Van Jacobson and will not ask the peer to do so.

Disable the IPXCP and IPX protocols - this option should only

be selected if the peer is not working properly and cannot

handle requests from PPPD for IPXCP negotiation.

Fig. II-195: Advanced PPP Settings page

VPN Configuration

A VPN (Virtual Private Network) is established to connect two local networks (intranets) securely over the Internet securely. The VPN routers

manage authentication between servers and clients and handle data encryption for the connection. Only authorized users may access the network

and the data exchange cannot be intercepted.

VPN connections are, in many ways, like every Internet connection, they are based on IP addresses, which means, the concerned VPN gateways

must authenticate the IP addresses of their respective partner’s VPN gateways. Each time a specific VPN is to be established, usually the same IP

addresses are expected. This will not create problems if both VPN partners have fixed WAN IP addresses. There may be circumstances reasons to

prefer dynamically allocated IP addresses. To enable devices that use a variable IP address as part of a VPN, they are turned into “Road Warriors”.

For example, at this point they are able to reach their corporate network via authentication at the company's VPN gateway device. This VPN gateway

device must have a fixed IP address for Internet access. Every VPN needs at least one VPN gateway with a fixed IP address.

The partner devices of a VPN must have different WAN IP addresses, and if they are connected to local area networks, these LAN’s must have

different IP addresses. As all Quadro devices have the same default IP addresses on delivery, at least one of them must be reconfigured in order to

set a new IP address.

Quadro supports several kinds of VPN connections such as IPSec, L2TP and PPTP.

The VPN Configuration page offers IPSec Configuration and

PPTP/L2TP Configuration links that lead to the corresponding

feature settings pages.

Attention: It is strongly recommended not to run different types

of VPN tunnels between the same endpoints simultaneously.

Fig. II-196: VPN Configuration page

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