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09.16.2008 at 04:58AM PDT, ID: 23734754
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9.0

How to add additional Lines to an ACL to accept inbound SMTP Traffic

Asked by PeterHing in Network Software Firewalls, Simple Mail Transfer Protocol (SMTP), Cisco PIX Firewall

Tags: , , ,

How can I add additional lines/entries to an existing access list on our CISCO Pix to enable inbound SMTP traffic from a range of IP Addresses.

An extract of the config is as follows: What is the function of the fixup protocol smtp 25 entry.

I have some experience with cisco devices 3750 switched amongst others. When creating/editing access lists I needed to convert subnet masks
into wildcard mask to identify a range of addresses.

For example I need to enable smtp traffic from the following ranges

216.82.240.0 255.255.240.0 i.e 216.82.240.0 - 216.82.255.255.
85.158.136.0 255.255.248.0 i.e 85.158.136.0 - 85.158.143.255

I assume I can just add lines to the "access-list outside_in" acl

Would I need to convert any values to a wildcardmask.

E.g.

access-list outside_in permit tcp 216.82.240.0 255.255.240.0 host 68.236.65.132 eq smtp
access-list outside_in permit tcp 85.158.136.0 255.255.248.0 host 68.236.65.132 eq smtp

I have several other entries to add aswell
On a switch/router to save the config I use the command "wr mem" is this supported, added to this do I assume commands are immediate?

Many thanks

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Extract of Config
 
PIX Version 6.3(3)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password jeLykmnuWn2p6Wa7 encrypted
passwd xDTkHRALrwwFgM6/ encrypted
hostname pixboston
domain-name xxxxxxxx.com
clock timezone EST -5
clock summer-time EDT recurring
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list vpn permit ip 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.0 
access-list nonat permit ip 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.0 
access-list nonat permit ip 192.168.2.0 255.255.255.0 10.4.0.0 255.255.0.0 
access-list nonat permit ip 192.168.2.0 255.255.255.0 10.5.0.0 255.255.0.0 
access-list nonat permit ip 192.168.2.0 255.255.255.0 10.3.0.0 255.255.0.0 
access-list nonat permit ip 192.168.2.0 255.255.255.0 10.2.0.0 255.255.0.0 
access-list outside_in permit tcp any host 68.236.65.132 eq https 
access-list outside_in permit tcp any host 68.236.65.133 eq pptp 
access-list outside_in permit gre any host 68.236.65.133 
access-list outside_in permit tcp any host 68.236.65.134 eq 3101 
access-list vpn_cp permit ip 192.168.2.0 255.255.255.0 10.4.0.0 255.255.0.0 
access-list vpn_wgc permit ip 192.168.2.0 255.255.255.0 10.5.0.0 255.255.0.0 
access-list vpn_prince permit ip 192.168.2.0 255.255.255.0 10.3.0.0 255.255.0.0 
access-list vpn_toot permit ip 192.168.2.0 255.255.255.0 10.2.0.0 255.255.0.0
[+][-]09.16.2008 at 05:16AM PDT, ID: 22487488

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About this solution

Zones: Network Software Firewalls, Simple Mail Transfer Protocol (SMTP), Cisco PIX Firewall
Tags: Cisco, PIX, 6.3(3), ACL Configuration
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Solution Provided By: lrmoore
Participating Experts: 1
Solution Grade: A
 
 
[+][-]09.16.2008 at 05:17AM PDT, ID: 22487500

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[+][-]09.16.2008 at 05:36AM PDT, ID: 22487665

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[+][-]09.16.2008 at 05:40AM PDT, ID: 22487690

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

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