Cisco Switch VLAN design

A switch has two VLANs, VLAN 3 and 4.

The internet router will be connect to VLAN 3. A firewall with one leg will connect to VLAN 3 while the other leg will connect to VLAN 4. Internal servers will be plugged into VLAN 4.

1. Is it common way to split the internet and internal with two separate VLANs ?
2. Once there is a device (say a firewall) plugged into the internet and internal internet, can two IP be pingable if nothing is configured with the firewall. (ie. inter-vlan routing within switch)
3. Providing the firewall rule has been setup for mapping from public IP to internal web server, will the routing always go through the firewall routing ? Does I need to explicitly setup any ACL on the switch ?

Tks
AXISHKAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
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:
1. Is it common way to split the internet and internal with two separate VLANs ?   -- Yes. That's indeed too. If you separated both internet and intranet networks, its easy to filter/safe the lan network from internet by applying policies(firewall/acl/nat etc)

2. Once there is a device (say a firewall) plugged into the internet and internal internet, can two IP be pingable if nothing is configured with the firewall. (ie. inter-vlan routing within switch)  -- Nope.. If nothing is configured on the Firewall, then you can't ping


3. Providing the firewall rule has been setup for mapping from public IP to internal web server, will the routing always go through the firewall routing ? Does I need to explicitly setup any ACL on the switch ?  -- That's your wish. either you can apply acl in the switch or you can leave, But in Firewall, you have/should to apply proper firewall rules to safe your webserver from internet
AXISHKAuthor Commented:
#2 if a device with(no firewall between them) public IP in vlan 2, another device with internal ip in vlan 3, they are pingable with each other, correct?

#3 no acl need, only setup the firewall rule, correct
NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
#2 if a device with(no firewall between them) public IP in vlan 2, another device with internal ip in vlan 3, they are pingable with each other, correct?

Yes.  The public ip can be pingable from the LAN ip provided, if you have the NAT/routing/switching/cabling between the devices.


#3 no acl need, only setup the firewall rule, correct  -- Yes. setting up firewall rules is enough. Still you can apply acl on the switch too.that's your wish. but not mandatory,
Cloud as a Security Delivery Platform for MSSPs

Every Managed Security Service Provider (MSSP) needs a platform to deliver effective and efficient security-as-a-service to their customers. Scale, elasticity and profitability are a few of the many features that a Cloud platform offers. View our on-demand webinar to learn more!

AXISHKAuthor Commented:
for #2, a. workstation with public ip in vlan 2 and another workstation in internal vlan 3 ,  they are pingable by default under cisco switch without further configuration, correct?
NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
for #2, a. workstation with public ip in vlan 2 and another workstation in internal vlan 3 ,  they are pingable by default under cisco switch without further configuration, correct?   -- Yes; They can ping each other, provided if the inter vlan routing is enabled in the cisco switch

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
AXISHKAuthor Commented:
Tks
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
Networking

From novice to tech pro — start learning today.