3.2.18. cg-nat¶

Note

requires a Turbo CG-NAT Application License.

CG-NAT configuration.

vrouter running config# vrf <vrf> cg-nat

enabled¶

Enable/disable CG-NAT in this VRF.

vrouter running config# vrf <vrf> cg-nat
vrouter running cg-nat# enabled true|false

Default value: true

alg¶

Application-Level Gateway.

vrouter running config# vrf <vrf> cg-nat
vrouter running cg-nat# alg ALG

`ALG` values	Description
ftp	ALG for File Transfer Protocol.
h323-q931	ALG for H.225.0 Call Signaling Protocol.
h323-ras	ALG for H.225.0 Registration, Admission and Status Protocol.
pptp	ALG for Point-to-Point Tunneling Protocol.
rtsp	ALG for Real Time Streaming Protocol.
sip-tcp	ALG for Session Initiation Protocol over TCP.
sip-udp	ALG for Session Initiation Protocol over UDP.
tftp	ALG for Trivial File Transfer Protocol.
dns-udp	ALG for Domain Name System.

pool¶

Pools of IP addresses for the CG-NAT rules.

vrouter running config# vrf <vrf> cg-nat pool <string>

Pool name.

address¶

IPv4 addresses in the pool.

vrouter running config# vrf <vrf> cg-nat pool <string>
vrouter running pool <string># address ADDRESS

`ADDRESS` values	Description
<ipv4-address>	An IPv4 address.
<ipv4-prefix>	An IPv4 prefix: address and CIDR mask.
<ipv4-range>	An IPv4 address range, in the form addr4-addr4.

block-size (mandatory)¶

Number of ports that will be assigned to a given user.

vrouter running config# vrf <vrf> cg-nat pool <string>
vrouter running pool <string># block-size <uint32>

port-range¶

Range of ports used for each address of the pool.

vrouter running config# vrf <vrf> cg-nat pool <string>
vrouter running pool <string># port-range START END

START¶

Port range start.

START

START

A 16-bit port number used by a transport protocol such as TCP or UDP.

END¶

Port range end.

END

END	A 16-bit port number used by a transport protocol such as TCP or UDP.

rule¶

List of CG-NAT rules.

vrouter running config# vrf <vrf> cg-nat rule <uint16>

Id and priority of the rule. Higher number means lower priority.

match¶

Match parameters.

vrouter running config# vrf <vrf> cg-nat rule <uint16> match

outbound-interface (mandatory)¶

Interface to match on outbound.

vrouter running config# vrf <vrf> cg-nat rule <uint16> match
vrouter running match# outbound-interface OUTBOUND-INTERFACE

OUTBOUND-INTERFACE

An interface name.

source¶

Match on source address.

vrouter running config# vrf <vrf> cg-nat rule <uint16> match source

address¶

Match on source address.

vrouter running config# vrf <vrf> cg-nat rule <uint16> match source
vrouter running source# address ADDRESS

ADDRESS

An IPv4 prefix: address and CIDR mask.

translate-to¶

Translate to.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to

pool-name (mandatory)¶

Name of IP address pool used for translation.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# pool-name <leafref>

max-conntracks-per-user¶

Maximum number of conntracks assigned to a user. When set to 0, the number of conntracks is not limited.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# max-conntracks-per-user <uint32>

max-blocks-per-user¶

Maximum number of port blocks assigned to a user.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# max-blocks-per-user <uint16>

active-block-timeout¶

Interval during which the the current block is used to allocate sessions. When set to 0, the current block is always used.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# active-block-timeout <uint16>

user-timeout¶

Interval during which the current block remains active after all user flows have expired.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# user-timeout <uint16>

port-algo¶

Port allocation algorithm for new mappings.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# port-algo PORT-ALGO

`PORT-ALGO` values	Description
parity	Preserve port parity: an even port will be mapped to an even port, and an odd port will be mapped to an odd port.
random	Choose port randomly.

endpoint-mapping¶

NAT endpoint mapping behavior.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# endpoint-mapping ENDPOINT-MAPPING

`ENDPOINT-MAPPING` values	Description
dependent	Reuse port mapping for subsequent packets sent from the same internal IP address and port to the same external IP address and port.
independent	Reuse the port mapping for subsequent packets sent from the same internal IP address and port to any external IP address and port.

endpoint-filtering¶

NAT endpoint filtering behavior.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# endpoint-filtering ENDPOINT-FILTERING

`ENDPOINT-FILTERING` values	Description
dependent	Inbound packets from external endpoints are filtered out if they don’t fully match an existing mapping (IP/port src/dst).
independent	Inbound packets from external endpoints are filtered out only if their destination IP address and port don’t match an existing mapping (IP/port src can differ).

hairpinning¶

Enable communication between two hosts on the internal network, using their mapped endpoint.

vrouter running config# vrf <vrf> cg-nat rule <uint16> translate-to
vrouter running translate-to# hairpinning true|false

conntrack¶

Conntrack options.

vrouter running config# vrf <vrf> cg-nat conntrack

behavior¶

Specific TCP options.

vrouter running config# vrf <vrf> cg-nat conntrack
vrouter running conntrack# behavior <behavior> enabled true|false

`<behavior>` values	Description
tcp-window-check	TCP window check.
tcp-rst-strict-order	TCP rst strict order.

enabled (mandatory)¶

Enable option.

enabled true|false

timeouts¶

Timeouts for the different events/protocols.

vrouter running config# vrf <vrf> cg-nat conntrack timeouts

icmp¶

Conntrack options for ICMP.

vrouter running config# vrf <vrf> cg-nat conntrack timeouts
vrouter running timeouts# icmp <icmp> <uint32>

`<icmp>` values	Description
new	State NEW.
established	State ESTABLISHED.
closed	State CLOSED.

<uint32> (mandatory)¶

Timeout in seconds.

<uint32>

udp¶

Conntrack options for UDP.

vrouter running config# vrf <vrf> cg-nat conntrack timeouts
vrouter running timeouts# udp <udp> <uint32>

`<udp>` values	Description
new	State NEW.
established	State ESTABLISHED.
closed	State CLOSED.

<uint32> (mandatory)¶

Timeout in seconds.

<uint32>

gre-pptp¶

Conntrack options for GRE-PPTP.

vrouter running config# vrf <vrf> cg-nat conntrack timeouts
vrouter running timeouts# gre-pptp <gre-pptp> <uint32>

`<gre-pptp>` values	Description
new	State NEW.
established	State ESTABLISHED.
closed	State CLOSED.

<uint32> (mandatory)¶

Timeout in seconds.

<uint32>

tcp¶

Conntrack options for TCP.

vrouter running config# vrf <vrf> cg-nat conntrack timeouts
vrouter running timeouts# tcp <tcp> <uint32>

`<tcp>` values	Description
syn-sent	State SYN-SENT.
simsyn-sent	State SIMSYN-SENT.
syn-received	State SYN-RECEIVED.
established	State ESTABLISHED.
fin-sent	State FIN-SENT.
fin-received	State FIN-RECEIVED.
closed	State CLOSED.
close-wait	State CLOSE-WAIT.
fin-wait	State FIN-WAIT.
last-ack	State LAST-ACK.
time-wait	State TIME-WAIT.

<uint32> (mandatory)¶

Timeout in seconds.

<uint32>

logging¶

CG-NAT log configuration.

vrouter running config# vrf <vrf> cg-nat logging

enabled¶

Enable log.

vrouter running config# vrf <vrf> cg-nat logging
vrouter running logging# enabled true|false