Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 11 NAT Configuration Commands
3Com Corporation
11-5
tcp-syn: Sets the address translation lifetime for TCP SYN connections to 60 seconds
(default).
udp: Sets the address translation lifetime for UDP to 300 seconds (default).
seconds: Time value in the range 10 to 86400 (24 hours).
Description
Use the nat aging-time command to set the lifetime of NAT connections.
This command is used to set the lifetime of address translation connection in seconds,
and different time values are set for different types of protocols.
Example
# Set the valid connection time of TCP to 240 seconds.
[3Com] nat aging-time tcp 240
11.1.5 nat alg
Syntax
nat alg { dns | ftp | h323 | ils | nbt | pptp | sip }
undo nat alg { dns | ftp | h323 | ils | nbt | pptp | sip }
View
System view
Parameter
dns: Supports DNS.
ftp: Supports FTP.
h323: Supports H.323.
ils: Supports Internet locator service (ILS).
nbt: Supports NetBIOS over TCP/IP.
pptp: Supports point to point tunneling protocol.
sip: Supports session initiation protocol.
Description
Use the nat alg command to enable the application gateway function of NAT.
Use the undo nat alg command to disable the application gateway function of NAT.
By default, the application gateway function of NAT is enabled.
Example
# Enable the application gateway function of NAT, allowing it to support FTP.