3com MSR 20-20 참조 매뉴얼

ftp: Supports FTP.

ils: Supports ILS.

nbt: Supports NBT.

pptp: Supports PPTP.

Use the nat alg command to enable NAT application layer gateway for the 
specified protocol.

Use the undo nat alg command to disable NAT application layer gateway.

By default, NAT application layer gateway is enabled.

# Enable NAT application layer gateway for FTP.

<Sysname> system-view

[Sysname] nat alg ftp 

nat connection-limit-policy policy-number

undo nat connection-limit-policy policy-number

System view

policy-number: Number of the connection-limit policy to be bound with the NAT 
module. The value ranges from 0 to 19.

Use the nat connection-limit-policy command to bind a connection-limit 
policy with the NAT module.

Use the undo nat connection-limit-policy command to remove the 
configuration.

Note that:

■

A NAT module can be bound with only one policy.

■

The globally configured connection limits are not effective unless a 
connection-limit policy is bound to the NAT module.

■

If there are multiple NAT boards, the configuration applies to all the boards.

# Bind connection-limit policy 1 with the NAT module.

<Sysname> system-view

[Sysname]nat connection-limit-policy 1 

# Remove the binding between connection-limit policy 1 and the NAT module.