Enabling access to outside SMTP server

I've seen a Cisco Pix 501 and use it to access the Internet. It is configured to use PPPoE and is linked to an ADSL line. It works very well, however I'm trying to configure it to allow access to my internal mail server. I read this previous post:

https://supportforums.Cisco.com/thread/72060

I followed all the instructions, but it still does not work. What I am doing wrong?

Here is my configuration:

6.3 (4) version PIX

interface ethernet0 10baset

interface ethernet1 100full

ethernet0 nameif outside security0

nameif ethernet1 inside the security100

activate the password * encrypted

passwd * encrypted

somehost hostname

domain abcd.ef

clock timezone EDT 0

clock to summer time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 02:00

fixup protocol dns-maximum length 1500

fixup protocol ftp 21

fixup protocol h323 h225 1720

fixup protocol h323 ras 1718-1719

fixup protocol http 80

no correction protocol rsh 514

fixup protocol rtsp 554

fixup protocol sip 5060

fixup protocol sip udp 5060

fixup protocol 2000 skinny

fixup protocol smtp 25

fixup protocol tftp 69

names of

name 10.1.1.19 mailserver

out2in tcp allowed access list any interface outside eq smtp

pager lines 24

debug logging in buffered memory

Outside 1500 MTU

Within 1500 MTU

IP address outside pppoe setroute

IP address inside 10.1.1.2 255.255.255.0

alarm action IP verification of information

alarm action attack IP audit

history of PDM activate

NAT (inside) 1 0.0.0.0 0.0.0.0 0 0

public static tcp (indoor, outdoor) interface smtp server e-mail smtp netmask 255.255.255.255 0 0

Access-group out2in in interface outside

Timeout xlate 03:00

Timeout conn 01:00 half-closed 0:10:00 udp 0: CPP 02:00 0:10:00 01:00 h225

H323 timeout 0:05:00 mgcp 0: sip from 05:00 0:30:00 sip_media 0:02:00

Timeout, uauth 0:05:00 absolute

GANYMEDE + Protocol Ganymede + AAA-server

AAA-server GANYMEDE + 3 max-failed-attempts

AAA-server GANYMEDE + deadtime 10

RADIUS Protocol RADIUS AAA server

AAA-server RADIUS 3 max-failed-attempts

AAA-RADIUS deadtime 10 Server

AAA-server local LOCAL Protocol

No snmp server location

No snmp Server contact

SNMP-Server Community public

No trap to activate snmp Server

enable floodguard

Telnet 10.1.1.17 255.255.255.255 inside

Telnet timeout 5

SSH 10.1.1.17 255.255.255.255 inside

SSH timeout 5

management-access inside

Console timeout 0

VPDN group PRMM request dialout pppoe

VPDN group PRMM localname [email protected] / * /

VPDN group PRMM ppp authentication pap

VPDN username [email protected] / * / password * local store

dhcpd dns 10.1.1.18 10.1.1.8

dhcpd outside auto_config

password to user auser name * encrypted privilege 2

Terminal width 80

Cryptochecksum: *.

: end

Here are the lines of interest:

name 10.1.1.19 mailserver

out2in tcp allowed access list any interface outside eq smtp

public static tcp (indoor, outdoor) interface smtp server e-mail smtp netmask 255.255.255.255 0 0

Access-group out2in in interface outside

What I am doing wrong?

TIA

Daniel,

How do you test the access to this server?

For example, what happens if you Telnet from outside your public IP address on port 25? If you can telnet to port 25, then the PIX config is fine and you should start looking at the server config.

Now if this does not work what do I you see if you're doing a "show xlate | Inc. 10.1.1.19.

In addition, you can try to activate a capture and see if the packets are making it through the PIX:

access-list 199 permit tcp any host 10.1.1.19 eq 25

access-list 199 permit tcp host 10.1.1.19 eq 25 all

capture the interface access-list 199 emailserver inside the length of the package-1300

Then try again to establish the connection and check what capture:

See capture emailserver

Try it and tell us how it goes.

Raga

Tags: Cisco Security

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