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Configure NAT

Configure NAT

Created: Yesterday 11:17Latest reply: Apr 20, 2022 15:21:03 84 4 0 0 0
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Hi all ,

I want some IP addresses that can normally access the Internet not to perform NAT, so we made the following configuration. But after the configuration, the IPs that do not perform NAT can't access the public network. 

This is my configuration.

Where is the problem?


acl number 3001
 rule 5 deny ip source 204.xx.xx.xx 0
 rule 10 deny ip source 204.xx.xx.yy 0

 rule 15 permit ip

interface GigabitEthernet1/0/1
 undo shutdown

 ip address xx.xx.xx.xx xx.xx.xx.xx

 nat bind acl 3001 instance nat1



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DDSN
Admin Created Yesterday 12:25

Hi hasanarcas,

The deny rule in the ACL will directly discard packets. If you do not want to perform NAT for some addresses, you can configure two ACLs, one ACL permits the addresses that do not need NAT, and the other ACL is used for NAT.

The script is as follows:

acl number 3001
rule 5 permit ip source 203.xx.xx.xx 0
rule 10 permit ip source 203.xx.xx.yy 0
#
acl 3002
rule 5 permit ip source xx.xx.xx.xx xx
#
traffic classify NoNAT
 If match acl 3001
#
traffic classify NAT
 If match acl 3002
#
traffic behavior NoNAT
permit
#
traffic behavior NAT
 nat bind instance 3333
#
traffic policy NAT
Classify NoNAT behavior NoNAT
Classify NAT behavior NAT
#

interface GigabitEthernet1/0/1
undo shutdown

traffic-policy NAT outbound


I hope it helps!

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liqiang185
liqiang185 Admin Created Yesterday 11:24

Dear friend! Please rest assured that we'll be back with an answer shortly.
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hasanarcas
hasanarcas Created Yesterday 11:25

Posted by liqiang185 at 2022-04-20 11:24 Dear friend! Please rest assured that we'll be back with an answer shortly.
thank you
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4#
DDSN
DDSN Admin Created Yesterday 12:25

Hi hasanarcas,

The deny rule in the ACL will directly discard packets. If you do not want to perform NAT for some addresses, you can configure two ACLs, one ACL permits the addresses that do not need NAT, and the other ACL is used for NAT.

The script is as follows:

acl number 3001
rule 5 permit ip source 203.xx.xx.xx 0
rule 10 permit ip source 203.xx.xx.yy 0
#
acl 3002
rule 5 permit ip source xx.xx.xx.xx xx
#
traffic classify NoNAT
 If match acl 3001
#
traffic classify NAT
 If match acl 3002
#
traffic behavior NoNAT
permit
#
traffic behavior NAT
 nat bind instance 3333
#
traffic policy NAT
Classify NoNAT behavior NoNAT
Classify NAT behavior NAT
#

interface GigabitEthernet1/0/1
undo shutdown

traffic-policy NAT outbound


I hope it helps!

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  • convention：
(0) (0)
5#
hasanarcas
hasanarcas Created Yesterday 15:21

Posted by DDSN at 2022-04-20 12:25 Hi hasanarcas,The deny rule in the ACL will directly discard packets. If you do not want to perform ...
great and clear answer!
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