topic ASA inside <----> outside not working in Network Security

ASA inside <----> outside not working

Caue W — Tue, 12 Mar 2019 07:51:08 GMT

Guys, I´m new to ASA FW, Im facing some difficults to get it work correctly.

Issue is, this was moved by customer and he has no documentation at all. All cables everything was disconnected.

Anyway, right now I cabled it like this:

SWITCH <-------> FIREWALL INSIDE (G0/0 - BVI1) <-----> FIREWALL OUTSIDE (G0/1 -BVI1) <-----> ROUTER INTERNET

Ping tests:

Firewall (BVI1 - 192.168.100.3) - Switch (192.168.100.6) - OK

Firewall - Router (192.168.100.1) - OK

Firewall - Internet (8.8.8.8) - OK

Switch (192.168.100.6) - Firewall (BVI1 - 192.168.100.3) - OK

Switch (192.168.100.6) - Router (192.168.100.1) - Not Working

Switch (192.168.100.6) - Internet (8.8.8.8) - Not working

Router (192.168.100.1) - Firewall (BVI1 - 192.168.100.3) - OK

Router (192.168.100.1) - Switch (192.168.100.6) - Not Working

Router (192.168.100.1) - Internet (8.8.8.8) - OK

Basically inside to outside is not working.

If I remove the firewall and plug the Router on the switch, everything works.

Am I missing something? Configuration is attached.

Thanks!

Hi

Francesco Molino — Mon, 06 Jun 2016 16:31:15 GMT

You have some acls thatbare not attached to your interfaces. If you have a look through asdm you will not see acls attached.

Try to do:

access-group inside_access_in in interface inside

Access-group outside_access_in in interface outside

Afterwards let's do your ping from switch to router and let me know.

Sorry, check acl to be sure that names are correct because I'm with my mobile and not able to copy/paste.

Hello Francesco, how are you?

Caue W — Mon, 06 Jun 2016 17:12:29 GMT

Hello Francesco, how are you?

Thanks for the input!

In fact, I tried to remove just to make sure it wasn´t blocking.

Just configured the access-group back, it still the same, no access from switch to router.

Those are the lines I´ve added (pretty much the same you sent to me):

access-group outside_access_in in interface outside
access-group inside_access_in in interface inside

Any ideas?

Also, the firewall is in the middle between switch and router, I´ve no topology, but Im assuming this is the way it should be, right?

Thanks!

Ok. I'm back on a laptop to

Francesco Molino — Mon, 06 Jun 2016 18:34:43 GMT

Ok. I'm back on a laptop to have a better view of your config file. Both interfaces have the same security-level. I don't know if this is correct or not.

If the outside security-level has not to be 100 but less then you need to activate the line of outside acl that's deactivated right now.

If security-level are set correctly, you need to add the command same-security-traffic permit inter-interface.

It should works after this change.

Let me know

Hi,

Francesco Molino — Wed, 08 Jun 2016 22:51:36 GMT

Hi,

Does the solution I gave you was fine?

If your problem is solved don't forget to rate answers and mark it at correct answer.

Thanks