What firewall rules to set for an internal network?

hello

the internet connection is made by  LinkSys modem router Zyxel Prestige 600 series

 LinkSys modem router Zyxel Prestige 600 series

the linksys is connected with dlink router DSR-500N

the computer inside the network go to the internet, use outlook (smpt pop default port)

there no database connection to internet

I post a screenshot for the DLINK router

and a screenshot for the prestige linksys (it seems there are not firewall rules in the linksys)

Regards
Dlink Firewall rules setupMr THOMAS Patrice
zyxel.JPG
patrocle_runAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
Based on your update, I can see the the computer in LAN network can connect internet?

Exactly what is the issue in your network?

//there no database connection to internet//   -- what does it mean?  does the database server not able to connect internet
0
patrocle_runAuthor Commented:
hello

yes, the all computer in network connect to internet without problem

the server also.

the database not need to connect to internet

patrice
0
NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
@patrice  -- currently whats the issue in your network?

can you elaborate a bit please?
0
What were the top attacks of Q1 2018?

The Threat Lab team analyzes data from WatchGuard’s Firebox Feed, internal and partner threat intelligence, and a research honeynet, to provide insightful analysis about the top threats on the Internet. Check out our Q1 2018 report for smart, practical security advice today!

patrocle_runAuthor Commented:
there are no problem in the network

i thought is was not normal that there are not firewall rules
0
patrocle_runAuthor Commented:
The good firewall rules is :

- block all ports

- list all application we need (HTTP,FTP,POP,SMTP,etc...)

- open only ports needed (80,8080,443,20,21,110,...etc)


Generally, it needs :

internet ( port 80,8080 HTTP) , HTTPS : port 443
ftp ( port 20,21)
mail (SMTP,POP  : port 110,25)

It needs to be ensured that all ports (used by applications that connect to internet) are opened

note : SMTP secured and POP secured use other ports
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
patrocle_runAuthor Commented:
this is answer for the question.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Network Security

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.