Facing Natting Problem...

[Manas Behera]

Hi folks,

I have configured PAT from lan interface to wan interface and its working. LAN ip address is 172.16.0.0/16 and NATTED ip address is 125.19.11.145.  i  have configured static pat from wan to lan interface for mail service.   External mail is hit to my 172.16.1.20 ip which is spam filtering  server and then come to my mail server (IP 172.16.1.11).  My incoming  mail is working fine and i receive mail from 125.19.11.146 IP.  but when  i send mail from my lan to outside it is showing IP address  125.19.11.145 and some time it not reach to destination.  Due to this  problem my 125.19.11.146 IP has registered in RBL block list. I want to  use same IP address for incoming and outgoing mail. 

Configuration:-

access-list 1 permit 172.16.0.0 0.0.255.255

ip nat pool MMTC 125.19.11.145 125.19.11.145 prefix-length 30

ip nat inside source list 1 pool MMTC overload

interface FastEthernet0/0

ipnat inside

interface Serial0/2/1

ipnat outside

ip nat inside source static tcp 172.16.1.20 25 125.19.11.148 25 extendable

ip nat inside source static tcp 172.16.1.11 80 125.19.11.148 80 extendable

ip nat inside source static tcp 172.16.1.11 443 125.19.11.148 443 extendable

Router IOS:  c2800nm-advsecurityk9-mz.124-

15.XZ2.bin

i have attached the config file please check and provide solution on this as soon as possible. 

[Latchum Naidu · Accepted solution]

Hi Manas,

As I understand that your spam filter server 172.16.1.20 is your email Gateway and 172.16.1.11 is your exchange server.

From internet you are getting hits to 172.16.1.20 which have a record with IP 125.19.11.148

As per process... email from external domain will come first to your gateway which is (172.16.1.20 PI: 125.19.11.148) then it will route to your exchange server which is 172.16.1.11

Do you agree with above?

If yes for what purpose your internal exchange server have NAT?

Please rate the helpful posts.
Regards,
Naidu.

[Manas Behera]

Hi Naidu,

I aggred on your question.

i will change the configuration and give you the feedback.

Regards,

Manas Ranjan Behera

+91-9560499888

[Latchum Naidu]

Hi Manas,

I hope that will solve your problem, if not leve me know.
Do remember to rate the all helpfull posts as well.

Please rate the helpful posts.
Regards,
Naidu.

[Manas Behera]

Hi Naidu,

Thank you for your reply.

i am agreed on your question.

Today i will remove the command and give you the feedback.

On Thu, Sep 29, 2011 at 1:17 PM, naiduccnp <

[antognius]

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