NEXPEED NBG440 User’s Manual
NexComm Systems, Inc. 84 PAGE
> UDP translations time out after 120 seconds
> ICMP translations time out after 10 seconds
You can manually change timeouts using the following command :
COMMAND
(conf)# nat timeout tcp|udp|icmp <seconds>
Parameters
tcp : TCP translation
udp : UDP translation
icmp : ICMP translations
<seconds> - timeout value in seconds
Classic NAT (one NAT IP address assigned per one local IP address)
With classic NAT, one local IP address is translated one NAT IP address. This NAT technique is
primarily used to make certain hosts on private LAN globally visible and give them the ability to
remap these IP addresses are well.
You can set up static mapping or dynamic mapping between local IP addresses and global IP
addresses. Also you can set up both two maps.
Configuring static mapping
This translation is used when the connection to the internal network is attempted from
the outside. It is often used for the server IP address application.
Step1
> Make the one-to-one mapping between the local IP address and the global IP
address.
COMMAND
(conf)# nat static <local-ip> <global-ip>
Parameters
<local-ip> - the local IP address
<global-ip> - the global IP address
Step2
> Enable NAT. Set up the outside interface that will be subject to translation.
COMMAND
(conf)# nat outside <ifname>
Parameters
<ifname> - Interface name
