PIX 506E PDM 3.0(1) PIX 6.3(3) NAT/PAT


I have an PIX 506E, seems to be a wonderfull thing... but i can't seem to get it working properly... This is the situation:

I have as a modem the Zyxel Prestige 660HW wich is used as modem, but it will NAT the public ip.

Zyxel WAN : Internet (public ip natted, DMZ is LAN : mask

Cisco WAN : mask LAN : mask

What i want is that form the outside everything is blocked and from the inside lan ( all allowed to outside (internet), then here it comes i want to PIX to allow several services, for example WEB and SMTP but als more, i only used WEB and SMTP as examples in my configuration. This last thing is not working... The internet from inside to the outside is working perfectly, and the PIX is with every test STEALTH. So no problems with that. My config with the mapping and allowings of SMTP and WEB are not working properly. When i connect from the outside with SMTP by a telnet program, it connects, it also gives the message my mailserver should give, only corrupted... so the data it gives is not readable...

Does anyone have any idea that seems to be the problem...? or someone able to give me a working config in my situation so i can put it in and then change the defaults...?

I have made the configuration below with PDM 3.0(1), and more or less i have no idea how to make the rules by commandline so that is why i am using PDM. Though when i have a working config i can see in PDM how it is supposed to be.

Sincerely, Michiel

P.S. When i use instead of the PIX 506E a more simple or other firewall/cable router in the same config then it is working fine. P.S. Below here is the config of the PIX 506E Building configuration... : Saved : PIX Version 6.3(3) interface ethernet0 auto interface ethernet1 auto nameif ethernet0 outside security0 nameif ethernet1 inside security100 enable password xxxxxxxxxxxxxpasswd xxxxxxxxxxxxx hostname pixfirewall domain-name test.local 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 outside_access_in permit icmp any any access-list outside_access_in remark smtp access-list outside_access_in permit tcp any any eq smtp access-list outside_access_in remark HTTP access-list outside_access_in permit tcp any any eq www access-list outside_access_in deny ip any any pager lines 24 mtu outside 1500 mtu inside 1500 ip address outside ip address inside ip audit info action alarm ip audit attack action alarm pdm location inside pdm logging informational 100 pdm history enable arp timeout 14400 global (outside) 1 interface nat (inside) 1 0 0 static (inside,outside) tcp interface smtp smtp netmask 0 0 static (inside,outside) tcp interface www www netmask 0 0 access-group outside_access_in in interface outside route outside 1 timeout xlate 0:05:00 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 RADIUS protocol radius aaa-server LOCAL protocol local http server enable http inside floodguard enable telnet timeout 5 ssh timeout 5 console timeout 0 terminal width 80 : end [OK]
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Does the HTTP work or is that broken as well?

The SMTP could be because the fixup smtp is on in your configuration. That denies any ESMTP commands and only accepts regular smtp commands through. This may or may not be the problem.


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Thanks SAto! ;)...

I have tested that, and that seems to be working fine... ;)... When i use telnet i see normal IIS html... so that is right!

But how can i get the ESMTP/SMTP working properly then...?

Will i need any special configuring for DNS/VPN/WEB/SMTP/POP/RDP traffic...? I am running on the LAN side my own DNS/VPN/WEB/SMTP/POP/RDP for public use. I have this as a temporary situation... because later i am going to have an connection with an ip block of at minumum 8 ip's... But for now i just need this to get working... ;)...


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enter config mode enable conf t no fixup smtp

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Chad Mahoney

Thanks Chad,

But i knew how to do it by console... after a few minutes of searching in the PDM i found the option... removed it, and DONE! ;)

The PIX is now good up and running! ;)...

I have another question, but make a new post on that...

Sincerely, Michiel

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