SMTP, DNS, HTTP traffic on Pix 501

[cyberfreek]

I just added a Windows and Exchange 2000 server, which are on the same box in a my internal network, and having dificult allowing SMTP, DNS and HTTP traffic. I have tried many options from this site and Ciscos and have not been able to figure it out.

I have restored my configuration back to the way I had it, so can someone please review it and help me understand what I'm missing?

Your support is much appreciated.

My configuration is as follows:

PIX Version 6.1(3)
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd WSgPDQg.Vy73lhFZ encrypted
hostname pixfirewall
domain-name ciscopix.com
fixup protocol ftp 21
fixup protocol http 80
fixup protocol h323 1720
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol sip 5060
fixup protocol skinny 2000
names
access-list 100 permit icmp any any echo-reply
access-list 100 permit icmp any any time-exceeded
access-list 100 permit icmp any any unreachable
access-list 100 permit gre any any
access-list 101 permit ip [local ip] 255.255.255.0 [remote ip] 255.255.255.0
access-list nonat permit ip [local ip] 255.255.255.0 10.0.0.0 255.255.255.0
access-list nonat permit ip [local ip] 255.255.255.0 [remote site] 255.255.255.0
access-list acl_out0 permit gre any any
pager lines 24
logging on
logging buffered errors
logging trap notifications
logging history notifications
interface ethernet0 10baset
interface ethernet1 10full
mtu outside 1500
mtu inside 1500
ip address outside x.x.x.x x.x.x.x
ip address inside x.x.x.x x.x.x.x
ip audit info action alarm
ip audit attack action alarm
ip local pool pptp-pool 10.0.0.1-10.0.0.5
pdm location x.x.x.x x.x.x.x inside
pdm location x.x.x.x x.x.x.x inside
pdm location x.x.x.x x.x.x.x outside
pdm location x.x.x.x x.x.x.x outside
pdm location x.x.x.x x.x.x.x outside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 x.x.x.x-x.x.x.x
global (outside) 1 interface
nat (inside) 0 access-list nonat
nat (inside) 1 x.x.x.x x.x.x.x 0 0
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
access-group 100 in interface outside
route outside 0.0.0.0 0.0.0.0 x.x.x.x 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 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
http server enable
http x.x.x.x x.x.x.x outside
http 19x.x.x.x x.x.x.x inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
no floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
no sysopt route dnat
crypto ipsec transform-set tm1 esp-3des esp-md5-hmac
crypto map xxx 1 ipsec-isakmp
crypto map xxx 1 match address 101
crypto map xxx 1 set peer x.x.x.x
crypto map xxx 1 set transform-set tm1
crypto map xxx interface outside
isakmp enable outside
isakmp key ******** address x.x.x.x netmask x.x.x.x
isakmp identity address
isakmp policy 1 authentication pre-share
isakmp policy 1 encryption 3des
isakmp policy 1 hash md5
isakmp policy 1 group 1
isakmp policy 1 lifetime 1000
telnet x.x.x.x x.x.x.x outside
telnet x.x.x.x x.x.x.x outside
telnet x.x.x.x x.x.x.x inside
telnet timeout 5
ssh timeout 5
vpdn group 1 accept dialin pptp
vpdn group 1 ppp authentication pap
vpdn group 1 ppp authentication chap
vpdn group 1 ppp authentication mschap
vpdn group 1 ppp encryption mppe auto
vpdn group 1 client configuration address local pptp-pool
vpdn group 1 pptp echo 60
vpdn group 1 client authentication local
vpdn username ******* password ********
vpdn enable outside
dhcpd address 192.168.2.10-192.168.2.40 inside
dhcpd dns 63.200.115.40 206.13.31.12
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
dhcpd enable inside
terminal width 80
Cryptochecksum:dcb4aee680d1d3695000f72a4df90731

 

[routerman]

In which direction are you having the problem? After looking at your configuration I note the following.

You have 2 NAT (inside) 1 statements, I'm not sure this is valid, may cause a problem. I would use NAT (INSIDE) 1 0 0
This will NAT every inside address apart from those specified in the NAT 0 ACL.

This line, access-list acl_out0 permit gre any any if applied will stop all outbound traffic apart from the GRE.

You ACL 100 is only permitting some ICMP and GRE, any other packets will be dropped.

If the problem is allowing this traffic in then you need to add a static translation:

static (inside,outside) outside-IP inside-server-IP

And you need to allow outside connections to be made to the outside address you specify in the static command.

access-list 100 permit any outside-IP eq smtp
access-list 100 permit any outside-IP eq domain
access-list 100 permit any outside-IP eq http

The outside address you pick has to be an unused address in your outside address space, dont use the interface address.

Finally you'll may need a static route on the PIX pointing at your internal server, unless its on the same newtork as the PIX inside interface. Also you'll neeed a default route on your server pointing the way to the PIX.

Hope that helps,

Andy

 

[cyberfreek]

routerman

Thanks for your response. Please bare with me fo I am trying to understand the pix language. I received this error when I attempted to create the static translation:

static (inside,outside) outside-IP inside-server-IP


ERROR: static overlaps with 67.117.67.224 to 192.168.2.2
Command failed

Please help.

 

[routerman]

This means that you already have a static configured or that one of the addresses you have use is allocated elsewhere in your configuration.

When you got your external IP address allocation, you should have a range, a minimum of 6 useable addresses. Two of these will be allocated to the PIX and your Internet facing router, leaving at least 4 spare. You need one of these for the Internet facing IP address for your smtp/web/ftp server. This address would be used to translate to your internal server address.