Nothing from Dmz to Outside Works

[rrgg]

Hy all.
This is my network:
Inside: 172.18.0.0 255.255.0.0
Dmz: 192.168.50.0 255.255.255.0
Outside: 80.80.80.112 255.255.255.240

This is my problem:
I need access from Dmz to Internet (Outside) (now don't work also icmp don't work)
(One must is the access from Inside to Dmz but not from Dmz to Inside, now this work correctly)

This is my configuration:
PIX Version 6.3(1)
interface ethernet0 10baset
interface ethernet1 auto
interface ethernet2 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 dmz security10
enable password *** encrypted
passwd ****encrypted
hostname PIX
domain-name intranet
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
names
access-list outside permit icmp any any echo-reply
access-list outside permit tcp any host 80.80.80.126 eq 8020
access-list nonat permit ip 172.18.0.0 255.255.0.0 10.0.4.0 255.255.255.0
access-list nonat permit ip 192.168.50.0 255.255.255.0 10.0.1.0 255.255.255.0
access-list nonat permit ip 172.18.0.0 255.255.0.0 192.168.50.0 255.255.255.0
access-list dmz permit icmp any any echo-reply
pager lines 21
mtu outside 1500
mtu inside 1500
mtu dmz 1500
ip address outside 80.80.80.114 255.255.255.240
ip address inside 172.18.1.254 255.255.0.0
ip address dmz 192.168.50.254 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool Comm1 10.0.1.1-10.0.1.20
ip local pool Networking 10.0.4.1-10.0.4.20
pdm location 172.18.0.0 255.255.0.0 inside
pdm location 172.18.0.0 255.255.255.255 inside
pdm location 192.168.50.0 255.255.255.0 inside
pdm location 10.0.1.0 255.255.255.0 outside
pdm location 10.0.4.0 255.255.255.0 outside
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list nonat
nat (inside) 1 172.18.0.0 255.255.0.0 0 0
nat (dmz) 0 access-list nonat
nat (dmz) 1 192.168.50.0 255.255.255.0 0 0
static (inside,outside) 80.80.80.126 172.18.1.4 netmask 255.255.255.255 0 0
access-group outside in interface outside
access-group dmz in interface dmz
route outside 0.0.0.0 0.0.0.0 80.80.80 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 RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http 172.18.0.0 255.255.255.255 inside
http 172.18.0.0 255.255.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set TRSET esp-3des esp-sha-hmac
crypto dynamic-map dynmap 10 set transform-set TRSET
crypto map VPN 10 ipsec-isakmp dynamic dynmap
crypto map VPN interface outside
isakmp enable outside
isakmp identity address
isakmp nat-traversal 20
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption 3des
isakmp policy 10 hash sha
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
vpngroup Comm1 address-pool Comm1
vpngroup Comm1 idle-time 1800
vpngroup Comm1 password ********
vpngroup Networking address-pool Networking
vpngroup Networking dns-server 172.18.1.5 172.18.1.2
vpngroup Networking wins-server 172.18.1.5 172.18.1.2
vpngroup Networking default-domain intranet
vpngroup Networking idle-time 1800
vpngroup Networking password ********
telnet 172.18.0.0 255.255.0.0 inside
telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80

 

[routerman]

Remove the access list on the DMZ port,

access-list dmz permit icmp any any echo-reply
access-group dmz in interface dmz

All this list is allowing is echo reply packets into the PIX from the DMZ, anything else will be dropped. Remember the implicit deny statement in a Cisco ACL.

 

[rrgg]

Tanks for answer now all works fine.
**********************************************************************************
I have another question:
in my configuration all requests from Inside to Dmz are allowed and all requests from Dmz to Inside are Dropped.

Now I need only for Tcp Port 25 allow trafic from Dmz to same Inside hosts.
Is possible?

Best regards
RRGG

 

[yizhar]

HI.

You have an internal mail server on "inside", and a mail-relay on "dmz". Right?

If so, then access from dmz to internal mail server can be established like this:

static (inside,dmz) 192.168.50.??? 172.18.1.???
OR:
static (inside,dmz) 172.18.1.??? 172.18.1.???

access-list fromdmz permit tcp host mail-relay host 192.168.50.??? eq 25
access-list fromdmz deny ip any 172.18.0.0 255.255.0.0
access-list fromdmz permit ip any any

You will also need to allow smtp traffic from outside to mail relay using static and access-list.



Yizhar Hurwitz

http://come.to/yizhar

http://teachers.sivan.co.il/yizhar