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Page 41 / 165 Scroll up to view Page 36 - 40
Telsey telecommunications
Web Interface
33
MT500--SIEN12
PPPoE
If
PPP over Ethernet
is chosen, regardless of the selected encapsulation
mode, the configuration pages are identical to PPP over ATM. All the
considerations explained in the PPPoA section remain valid.
MER
If
MAC Encapsulated Routing
is chosen, it is then necessary to configure
WAN IP Settings.
The following figure shows WAN IP Settings page for MER protocol.
The
IP Address
,
Default Gateway
and
DSN Server
can be obtained
automatically through the DHCP client in the CPVA500.
Otherwise, the user must enter static values in the appropriate fields.
After that, by clicking on Next, it is possible to enable Network Address
Translation (
NAT
). If the LAN is configured with a private IP address, the user
should select this checkbox. The NAT submenu on the left side main panel will
be displayed after reboot. The user can then configure NAT-related features
after the system comes up. If a private IP address is not used on the LAN side,
this checkbox should be deselected to free up system resources for better
performance. When the system comes back after reboot, the NAT submenu will
not be displayed on the left main panel.
Refer to page 37 in order to configure NAT features.
Besides NAT, from this page it is possible to enable WAN service (and assign a
service name), IGMP multicast (not supported yet) and Quality of Service. QoS
can be activated and then controlled by means of the relative menu (Advanced
Setup --> Quality of Service). Note that enabling QoS for a selected PVC
improves performance for selected classes of applications, but also reduces the
number of available PVC’s.
The following figure shows NAT, WAN Service, IGMP and QoS page.
Page 42 / 165
Telsey
telecommunications
Web Interface
MT500--SIEN12
34
By clicking on next, the setup summary will be displayed. Click on Save to apply
the settings.
Page 43 / 165
Telsey telecommunications
Web Interface
35
MT500--SIEN12
IPoA
If
IP over ATM
is chosen, it is then necessary to configure WAN IP Settings.
Enter WAN IP Address, Subnet Mask, Default Gateway and DNS Servers. Note
that DHCP is not supported, meaning that automatic provisioning is not
available when using IPoA.
After that, by clicking on Next, it is possible to enable Network Address
Translation (
NAT
). If the LAN is configured with a private IP address, the user
should select this checkbox. The NAT submenu on the left side main panel will
be displayed after reboot. The user can then configure NAT-related features
after the system comes up. If a private IP address is not used on the LAN side,
this checkbox should be deselected to free up system resources for better
performance. When the system comes back after reboot, the NAT submenu will
not be displayed on the left main panel.
Refer to page 37 in order to configure NAT features.
Besides NAT, from this page it is possible to enable WAN service (and assign a
service name), IGMP multicast (not supported yet) and Quality of Service. QoS
can be activated and then controlled by means of the relative menu (Advanced
Setup --> Quality of Service). Note that enabling QoS for a selected PVC
improves performance for selected classes of applications, but also reduces the
number of available PVC’s.
The following figure shows NAT, WAN Service, IGMP and QoS page.
Page 44 / 165
Telsey
telecommunications
Web Interface
MT500--SIEN12
36
The following figure shows Network Address Traslation Settings page.
By clicking on next, the setup summary will be displayed. Click on Save to apply
the settings.
Page 45 / 165
Telsey telecommunications
Web Interface
37
MT500--SIEN12
NAT Configuration
After enabling NAT (for MER, IPoA, PPPoA, PPPoE) and rebooting, on the left
side menu a new NAT submenu comes up. Network Address Translation (NAPT)
allows a single device, such as a router, to act as an agent between the Internet
(or "public network") and a local (or "private") network. This means that only
a single, unique IP address is required to represent an entire group of
computers.
Implementing dynamic NAPT automatically creates a firewall between your
internal network and outside networks, or between your internal network and
the Internet. NAPT only allows connections that originate inside the sub
domain. Essentially, this means that a computer on an external network cannot
connect to your computer unless your computer has initiated the contact. You
can browse the Internet and connect to a site, and even download a file; but
somebody else cannot latch onto your IP address and use it to connect to a port
on your computer. Under the NAPT environment, all computers behind the
NAPT are not accessible from outside (i.e., the WAN). However, if public
services, such as web servers, ftp servers or email servers, are needed from
your private network, a virtual server can be configured to set up permit
secured access. A virtual server setup enables a connection from outside to be
redirected to a host running the services on the private subnet. This host
running the services is called a virtual server (a virtual server is synonymous
with IP forwarding).
The NAT dialog box allows you to configure Virtual Servers and DMZ Host
settings by adding, removing and saving.
The following figures show the NAT configuration pages.
The first page is
NAT Virtual Servers
. Virtual server allows you to direct
incoming traffic from WAN side (identified by Protocol and External Port) to the
Internal server with private IP address on the LAN side. The internal port is

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