How can I block the SMTP for all users but mail server

I can't understand (1) how can I refuse port 25 for all users on the network and allow for Exchange server SMTP, also I have MS Exchange, which manages the web and smtp and in my setup below you can see that there static mapping to publick ip with http/smtp only, then (2) how can we separate the traffic entering a publc IP will outside servers inside ex : (MSexchange public ip address is x.x.x.207-> http = 172.16.2.13, 172.16.2.14 = smtp)

Thank you

___________________________________________________

6.3 (1) version PIX

interface ethernet0 car

Auto interface ethernet1

ethernet0 nameif outside security0

nameif ethernet1 inside the security100

names of

name 172.16.4.10 pdc

name 172.168.4.11 llc

name 172.16.4.11 ftp

object-group service E-mail tcp

port-object eq www

EQ smtp port object

object-group service tcp - udp terminal

3389 3389 port-object range

object-group service mw tcp - udp

Beach of port-object 367 367

radmin tcp service object-group

RemoteAdmin description

4899 4899 object-port Beach

object-group service mw1 tcp

Beach of port-object 367 367

access-list 101 tcp refuse any any eq smtp

access-list 101 permit tcp any host object-group x.x.x.251 terminal

access-list 101 permit tcp any host x.x.x.214 object-group radmin

access-list 101 permit tcp any email host x.x.x.207 object-group

access-list 101 permit tcp any host x.x.x.212 object-group mw1

access-list 101 permit tcp any host x.x.x.211 eq ftp

sheep ip access-list allow any 192.168.101.0 255.255.255.240

IP address outside x.x.x.194 255.255.255.192

IP address inside 172.16.2.1 255.255.0.0

IP verify reverse path to the outside interface

IP verify reverse path inside interface

alarm action IP verification of information

IP audit attack alarm drop action

IP local pool mypool 192.168.101.1 - 192.168.101.20

don't allow no history of pdm

ARP timeout 14400

Global interface 10 (external)

NAT (inside) 0 access-list sheep

NAT (inside) 10 0.0.0.0 0.0.0.0 0 0

static (inside, outside) x.x.x.212 172.16.4.12 netmask 255.255.255.255 0 0

static (inside, outside) x.x.x.251 172.16.4.51 netmask 255.255.255.255 0 0

public static x.x.x.214 (Interior, exterior) pdc netmask 255.255.255.255 0 0

public static x.x.x.211 (Interior, exterior) ftp netmask 255.255.255.255 0 0

"REM # 172.16.2.13's Exchange with Outlook Web servers #

static (inside, outside) x.x.x.207 172.16.2.13 netmask 255.255.255.255 0 0

Access-group 101 in external interface

Route outside 0.0.0.0 0.0.0.0 x.x.x.193 1

enable floodguard

Sysopt connection permit-pptp

VPDN PPTP-VPDN-group accept dialin pptp

VPDN group PPTP-VPDN-GROUP ppp authentication pap

VPDN group PPTP-VPDN-GROUP ppp authentication chap

VPDN group PPTP-VPDN-GROUP ppp mschap authentication

VPDN group PPTP-VPDN-GROUP ppp encryption mppe 40

VPDN group VPDN GROUP-PPTP client configuration address local mypool

VPDN group VPDN GROUP-PPTP client configuration dns 172.16.2.6 172.16.4.6

client PPTP-VPDN-GROUP VPDN group configuration wins nymc_pdc

VPDN group VPDN GROUP-PPTP pptp echo 60

VPDN group VPDN GROUP-PPTP client for local authentication

VPDN username * password *.

VPDN allow outside

This is your problem:

Access-group 101 in external interface

You link this access list to your external interface. This means that the rules are applied to incoming traffic IN your network. The implicit IP any any rule is because you have not bound to an access list on your inside interface.

To prevent users from going out, you will need this:

access list permit tcp host exchange_IP OUTPUT no matter what eq smtp

access list tcp OUTPUT deny any any eq smtp

Access-group interface inside OUT

See how this access list is linked to the inside interface... it will affect traffic leaving your network. Note: Once you apply this inside allow any interface it will remove the implicit.

Tags: Cisco Security

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