3Com Router 3031, Command Reference Manual

Page: 462 / 838

462 C
HAPTER
5: N
ETWORK
P
ROTOCOL
nat address-group Syntax
nat address-group group-number start-addr end-addr
undo nat address-group group-number
View
System view
Parameter
■
group-number: defined Address pool ID, it is an integer ranging from 0 to 31.
■
start-addr: Starting IP address in the address pool.
■
end-addr: Ending IP address in the address pool.
Description
Using the nat address-group command, you can configure an address pool. Using
the undo nat address-group command, you can delete an IP address pool.
Address pool indicates the cluster of some outside IP addresses. If start-addr and
end-addr are the same, it means that there is only one address.
CAUTION:
The length of an address pool (numbers of all addresses contained in an address
pool) cannot exceed 256.
The address pool cannot be deleted, if it has been correlated to some certain access control list
to perform the address translation.
Example
Configure an address pool from 202.110.10.10 to 202.110.10.15, with its NAT
pool ID being 1.
[3Com] nat address-group 1 202.110.10.10 202.110.10.15
nat aging-time Syntax
nat aging-time { | default | { tcp | udp | icmp } time-value} }
View
System view
Parameter
■
time-value: A time value, expressed in second and ranging from 10 to 600..
■
tcp: The timeout of TCP connection.
■
udp: The timeout of UDP connection.
■
icmp: The time-out time of the protocol ICMP.
■
default: Sets to the default value.
Description
Using the nat aging-time command, you can set the valid time of nat connection.
By default, the valid time for tcp address translation is 240 seconds, for udp it is 40
seconds, and for icmp it is 20 seconds.