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131
Appendix A
CONFIG Commands
For example, inclusion of subnet masks in RIP packets and implementation of
multicasting instead of broadcasting. This last feature reduces the load on hosts
which do not support routing protocols.
This command is only available when address mapping for the specified virtual
circuit is turned “off”.
Specifies whether the 3220-H should use Routing Information Protocol (RIP)
broadcasts to update its routing tables with information received from other rout-
ers on the other side of the PPP link.
This command is only available when address mapping for the specified virtual
circuit is turned “off”.
.
Specifies whether the 3220-H should flush (delete) entries from its routing table
when the specified virtual circuit is down and those routes are inaccessible.
This command is only available when address mapping for the specified virtual
circuit is turned “
off
”.
Static ARP Settings
Your Cayman Gateway maintains a dynamic Address Resolution Protocol (ARP)
table to map IP addresses to Ethernet (MAC) addresses. Your Cayman Gateway
populates this ARP table dynamically, by retrieving IP address/MAC address pairs
only when it needs them. Optionally, you can define static ARP entries to map IP
addresses to their corresponding Ethernet MAC addresses. Unlike dynamic ARP
table entries, static ARP table entries do not time out.
You can configure as many as 16 static ARP table entries for a Cayman Gateway.
Use the following commands to add static ARP entries to the Cayman Gateway
static ARP table:
Specifies the IP address for the static ARP entry. Enter an IP address in the
ip_address
argument in dotted decimal format. The
ip_address
argument
cannot be 0.0.0.0.
Specifies the Ethernet hardware address for the static ARP entry. Enter an Ethernet
hardware address in the
MAC_address
argument in
nn.nn.nn.nn.nn.nn
(hexadecimal) format.
DSL
set ip ip-ppp [
vccn
] rip-receive {off | v1 | v2 | v1-compat}
DSL
set ip ip-ppp [
vccn
] flush-routes { on | off }
BOTH
set ip static-arp ip-address
ip_address
BOTH
set ip static-arp hardware-address
MAC_address
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Appendix A
CONFIG Commands
Static Route Settings
A static route identifies a manually configured pathway to a remote network.
Unlike dynamic routes, which are acquired and confirmed periodically from other
routers, static routes do not time out. Consequently, static routes are useful when
working with PPP, since an intermittent PPP link may make maintenance of
dynamic routes problematic.
You can configure as many as 16 static IP routes for a Cayman Gateway. Use the
following commands to maintain static routes to the Cayman Gateway routing
table:
Specifies the network address for the static route. Enter a network address in the
net_address
argument in dotted decimal format. The
net_address
argu-
ment cannot be 0.0.0.0.
Specifies the subnet mask for the IP network at the other end of the static route.
Enter the
netmask
argument in dotted decimal format. The subnet mask associ-
ated with the destination network must represent the same network class (A, B, or
C) or a lower class (such as a class C subnet mask for class B network number) to
be valid.
Specifies the interface through which the static route is accessible.
If using a 3220-H platform the interface argument options are
{ ip-address | ppp-vccn }
.
Specifies the IP address of the Gateway for the static route. The default Gateway
must be located on a network connected to the Cayman Gateway configured
interface.
Specifies the metric (hop count) for the static route. The default metric is 1. Enter
a number from 1 to 15 for the integer argument to indicate the number of rout-
ers (actual or best guess) a packet must traverse to reach the remote network.
You can enter a metric of 1 to indicate either:
•
The remote network is one router away and the static route is the best way to
reach it;
BOTH
set ip static-routes destination-network
net_address
BOTH
set ip static-routes destination-network
net_address
netmask
netmask
BOTH
set ip static-routes destination-network
net_address
interface { ip-address | ppp }
BOTH
set ip static-routes destination-network
net_address
gateway-address
gate_address
BOTH
set ip static-routes destination-network
net_address
metric
integer
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Appendix A
CONFIG Commands
•
The remote network is more than one router away but the static route should
not be replaced by a dynamic route, even if the dynamic route is more effi-
cient.
Deletes a static route. Deleting a static route removes all information associated
with that route.
WAN Settings
Enables or disables communications through the WAN Ethernet port [or specified
VCC Interface] in the Cayman Gateway. You must enable TCP/IP [or BNCP] func-
tions for the WAN port before you can configure its network settings.
Assigns an IP address to the Cayman Gateway on the WAN [or specified VCC
interface]. The IP address you assign must be unique on your network.
Specifies the broadcast address for the TCP/IP network connected to the WAN
Ethernet port [or specified VCC interface]. IP hosts use the broadcast address to
send messages to every host on your network simultaneously.
The broadcast address for most networks is the network number followed by 255.
For example, the broadcast address for the 192.168.1.0 network would be
192.168.1.255. .
Specifies the subnet mask for the TCP/IP network connected to the WAN Ethernet
port [or specified VCC interface]. The subnet mask specifies which bits of the 32-
bit binary IP address represent network information. The default subnet mask for
most networks is 255.255.255.0 (Class C subnet mask).
BOTH
delete ip static-routes destination-network
net_address
Many of these setting commands are designated as
BOTH
.
Note however:
For the 3220-H (DSL platform) you must identify the virtual PPP
interface [
vccn
], a number from 1 to 8.
This argument does not apply to the 2E-H platform.
Also note that the 3220-H refers to the “specified VCC interface”
while the 2E refers to the “WAN Ethernet port.”
BOTH
set ip wan [vccn] option { on | off }
BOTH
set ip wan [vccn] address
ip_address
BOTH
set ip wan [vccn] broadcast
broadcast_address
BOTH
set ip wan [vccn] netmask
netmask
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Appendix A
CONFIG Commands
Specifies whether an administrator can open a telnet connection to the Cayman
Gateway over the WAN Ethernet interface [or specified VCC interface] to monitor
and configure the Cayman Gateway. The
admin-only
argument means that
router traffic is ignored but that administrative commands are accepted. The
none
argument means that all traffic is accepted.
Specifies whether network address translation (NAT) is enabled for the WAN port
[or specified VCC interface] on the Cayman Gateway.
.
Specifies whether you want the Cayman Gateway to respond when it receives an
address resolution protocol for devices behind it.
By default, proxy ARP is turned “
off
”.
IPMaps Settings
Specifies the name and static ip address of the LAN device to be mapped.
.
Specifies the name and static ip address of the WAN device to be mapped.
Up to 253 mapped static IP addresses are supported.
BOTH
set ip wan [vccn] restrictions
{ admin-disabled | admin-only | none }
If you specify
admin-only
access for the Cayman Gateway WAN port,
you will turn off routing services through that port or interface.
Do
NOT
turn on
admin-only
access without consulting with your net-
work administrator.
BOTH
set ip wan [vccn] addr-mapping { off | on }
BOTH
set ip wan [vccn] proxy-arp { on | off }
BOTH
set ip-maps name <
name
> internal-ip <
ip address
>
BOTH
set ip-maps name <
name
> external-ip <
ip address
>
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Appendix A
CONFIG Commands
Network Address Translation (NAT) Default Settings
NAT default settings let you specify whether you want your Cayman Gateway to
forward NAT traffic to a default server when it doesn’t know what else to do with
it. The NAT default host function is useful in situations where you cannot create a
specific NAT pinhole for a traffic stream because you cannot anticipate what port
number an application might use. For example, some network games select arbi-
trary port numbers when a connection is being opened. By identifying your com-
puter (or another host on your network) as a NAT default server, you can specify
that NAT traffic that would otherwise be discarded by the Cayman Gateway
should be directed to a specific hosts.
.
Specifies whether you want your Cayman Gateway to forward NAT traffic to a
default server when it doesn’t know what else to do with it.
Specifies the IP address of the NAT default server.
Network Address Translation (NAT) Pinhole Settings
NAT pinholes let you pass specific types of network traffic through the NAT inter-
faces on the Cayman Gateway. NAT pinholes allow you to route selected types of
network traffic, such as FTP requests or HTTP (Web) connections, to a specific
host behind the Cayman Gateway transparently.
To set up NAT pinholes, you identify the type(s) of traffic you want to redirect by
port number, and you specify the internal host to which each specified type of
traffic should be directed.
The following list identifies protocol type and port number for common TCP/IP
protocols:
•
FTP (TCP 21)
•
telnet (TCP 23)
•
SMTP (TCP 25),
•
TFTP (UDP 69)
•
SNMP (TCP 161, UDP 161)
Specifies the identifier for the entry in the router's pinhole table. You can name
pinhole table entries sequentially (1, 2, 3), by port number (21, 80, 23), by proto-
col, or by some other naming scheme.
BOTH
set nat-default option { off | on }
BOTH
set nat-default address
ip-address
BOTH
set pinhole name
name
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