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 ?

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AXISHKAsked:
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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
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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
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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,
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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?
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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
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AXISHKAuthor Commented:
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