Refuse SMTP traffic outside of everything EXCEPT the mail server

We have a PIX 515E Version 6.3 (3).

I want to warn the entire interior of the IPs to send traffic on port 25, EXCEPT our mail server.

Inside of the 10.10.10.xxx network

Outside IP 63.252.xxx.xxx

Mail server 10.10.10.9

These would work?

smtp_in list of access permitted tcp 10.10.10.9 255.255.255.255 63.252.xxx.xxx 255.255.255.255 eq smtp

smtp_in tcp access list refuse any host 63.252.xxx.xxx eq smtp

You must add

smtp_in list any eq 25 access permit tcp host 10.10.10.9

smtp_in tcp access-list deny any any eq 25

smtp_in ip access list allow a whole

Don't forget to apply the ACL to the inside interface with the command

smtp_in access to the interface inside group

Franco

Tags: Cisco Security

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