Please please advise!!
I have a problem with inter-vlan routing and using the correct gateway.
I have a network configured with 8 Vlans, each vlan is in a different subnet and resides in separate buildings in the campus.
VLAN 10 - 10.217.6.0/24 - ICT BLOCK
VLAN 20 - 10.217.7.0/24 - N-BLOCK
VLAN 30 - 10.217.8.0/24 - LIFT BLOCK
VLAN 40 - 10.217.9.0/24 - ADMIN BLOCK
VLAN 50 - 10.217.13.0/24 -TEC-BLOCK
VLAN 60 - AIRSPACE NETWORK
VLAN 70 -N 10.217.12.0/24 - SERVERS
VLAN 100 - 10.217.20.0/24 - MANAGEMENT VLAN
The network core comprises of 2 x 3750G-12S switches trunked together via 2 x fibre links and is configured as a collapsed core/distribution.
Each vlan has a trunk configured on each of the cores and also SVI interfaces for each vlan.
I have created 1 virtual address for both the core switches on the 10.217.12.0/24 network, where Core_sw_1 has an address of 10.217.12.21/24 and Core_sw_2 has an address of 10.217.12.22/24, they now share a virtual address of 10.217.12.50/24.
This 10.217.12.50 address is being used as a default gateway for all the vlans and servers. With this gateway in place and the use of a few IP Helper-address commands, every vlan/subnet can communicate with each other, log into the servers on the 10.217.12.0/24 network and also access the internet perfectly.
Butâ¦ 4 of the servers (Webmail, Webserver, etc) require inbound access from outside the LAN. But if I have these servers configured with the gateway of 10.217.12.50/24 then nothing can connect or access from the outside, but the LAN works good. If I change these servers DG to 10.217.12.1/24 (which is the address of the companies ISP owned/managed router) then remote and webserver access works perfectly but every other vlan on the LAN can no longer log into or even ping these servers, with the exception of the 10.217.12.0/24 network (vlan 70).
How can I get all vlans/subnets to communicate with the servers when the servers are using a DG of 10.217.12.1/24 and everything else uses a DG of 10.217.12.50/24?
Please help as it is causing a lot of downtime and not to mention frustration!