topic Re: dmz unable to access the internet in Network Security

dmz unable to access the internet

ronshuster — Mon, 11 Mar 2019 18:07:04 GMT

I have DMZ interface with 192.168.1.0\24with the following config on the firewall:

nat (dmz) 2 192.168.1.0 255.255.255.0

global (outside) 2 <publicIP>

the dmz interface on the firewall is 192.168.1.1 and it can ping all dmz servers, so routing is not the issue

and no access-group for the dmz interface.

yet dmz servers are unable to access the internet.

is there anything missing in this config?

when I run a capture I see the traffic hitting the dmz interface yet nothing coming back, ie:

158: 06:27:07.126000 192.168.1.13 > 4.2.2.2: icmp: echo request
159: 06:27:12.625822 192.168.1.13 > 4.2.2.2: icmp: echo request
160: 06:27:18.125771 192.168.1.13 > 4.2.2.2: icmp: echo request
161: 06:27:23.625639 192.168.1.13 > 4.2.2.2: icmp: echo request
162: 06:27:29.125573 192.168.1.13 > 4.2.2.2: icmp: echo request

Re: dmz unable to access the internet

Michael Dombek — Fri, 02 Jul 2010 20:14:32 GMT

Looks good from my point.

Please check the security lvl of your interfaces.

Maybe you need to assign a higher security lvl to your DMZ interface

HTH (if so please rate )

cheers Michael

Re: dmz unable to access the internet

Jennifer Halim — Fri, 02 Jul 2010 22:52:08 GMT

If you are testing with ping, please make sure that icmp inspection has been turned on/enabled.

If you are using the default policy map on the ASA, the configuration will be as follows:

policy-map global_policy
class inspection_default

inspect icmp

Hope that helps.

Re: dmz unable to access the internet

Nagaraja Thanthry — Tue, 06 Jul 2010 04:48:09 GMT

Have you enabled ICMP traffic on the outside interface of the firewall? If no, please try "icmp permit any outside". Also, which firewall you are using? Is it 5505? If it is 5505, you might have license limitations.