PIX 515E will not route SMTP traffic

[JezEling]

Hi All,

I'm the process of replacing one PIX firewall with another and have hit an issue that is driving me around the bend. I have done a basic configuration on a PIX 515E (6.3(4))which will replace my exisiting PIX 515 (6.3(3)), and have added in the usual static and access-list commands for my SMTP server. However I don't recieve any email at all, if I put the old PIX back online all works well.

Config as follows: -

PIX Version 6.3(4)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password ******** encrypted
passwd ********** encrypted
hostname pixfirewall
domain-name ************
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 rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
no fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list 100 permit tcp any host {Server IP} eq smtp
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside {IP address} 255.255.255.0
ip address inside {IP Address} 255.255.252.0
ip audit info action alarm
ip audit attack action alarm
arp timeout 14400
global (outside) 10 interface
nat (inside) 10 0.0.0.0 0.0.0.0 0 0
static (inside,outside) {IP Address} {IP Address} netmask 255.255.255.255 0 0
access-group 100 in interface outside
route outside 0.0.0.0 0.0.0.0 {IP Address} 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80

Has anyone ever experienced this before or can anyone offer any suggestions as to how I may resolve this issue?

Many Thanks In Advance

Jez

 

[baddos]

Where is access-list 100?

 

[JezEling]

How do you mean?

It's under the names command in the config: -

fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list 100 permit tcp any host {Server IP} eq smtp
pager lines 24
mtu outside 1500
mtu inside 1500

Jez

 

[baddos]

It's hard to determine it without seeing the address... Your access-list needs to show the public address and not the private address... I mean by hiding your addresses in your config on this website, it's hard to tell what you have in it.

 

[JezEling]

I see, sorry about that. In the config file I can confirm that the access-list does show the public address and not the private address.

 

[Triplejolt]

Is ACL 100 located on your outside interface?

A firm beleiver of the "Keep it Simple" philosophy
Cheers
/T

 

[JezEling]

Yes - access-group 100 in interface outside.

Jez

 

[Triplejolt]

Verify these statement:

static (inside,outside) {IP Address - outside public address} {IP Address - inside mailserver address} netmask 255.255.255.255 0 0

and...

access-list 100 permit tcp any host {Server IP - outside public address} eq smtp

This should allow SMTP traffic to flow unhindered towards your mailserver host-address.

A firm beleiver of the "Keep it Simple" philosophy
Cheers
/T