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Step-by-Step Configuration and Troubleshooting Best Practices for the NGFW, NGIPS and AMP Technologies A Visual Guide to the Cisco Firepower Threat Defense (FTD)
Community Member

Pix security level

Hi

We use security level 0 outside and 100 in inside. but when we use security level other interface (dmz) then 50 or 30 or 20. so my question is what is security difference 50 ,30, 20 ?.

when i use 50 or 30 or 20 ??

thanks

Biplob

4 REPLIES
Hall of Fame Super Blue

Re: Pix security level

Hi

By default the pix allows traffic to flow from a higher to a lower interface. If you want traffic to flow from a lower to higher you need to allow that traffic with an access-list.

So the difference in security numbers are eg.

You create a dmz (DMZ1) with a security number of 50

You create a dmz (DMZ2) with a security number of 40.

Traffic from DMZ1 is allowed to go through the outside interface and through DMZ2 without an access-list.

To go from DMZ1 to the inside would require an access-list.

Traffic from DMZ2 is allowed to go through the outside interface without an access-list.

To go from DMZ2 to DMZ1 or to the inside requires an access-list.

So you choose the numbers for your DMZ's based on how secure that DMZ is in relation to the other DMZ's.

HTH

Jon

Community Member

Re: Pix security level

Hi

your explation clear but not full clear.

you give example DMZ1 and DMZ2.

example : I have 1 Pix.

first time I configure:

if I have out o inside 100 and DMZ50

2nd Time I configure:

and again I aasign out 0 inside 100 and Dmz 40

so difference 50 and 40 what i get advantage or disadvantage.

thanks

Biplob

Hall of Fame Super Blue

Re: Pix security level

Hi

If you only have one DMZ it really makes no difference. 40 or 50 are both greater than 0 and less than 100 (your outside and inside interfaces) so whichever number you use it will have the same effect.

HTH

Jon

Community Member

Hello Guys,

Hello Guys,

Thanks for your information, it was really helpful for me in such a case.

Regards

Milad

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