Hi, I have this issue, i need to configure a LAN with 2 "dumbs" ADSL modems, separating the lan with 2 VLANs.
i have a 3Com 5500G Switch and two ADSL modems. Ppl here wont buy me another equipment.
DESIRED CONFIG:
1. Each VLAN must be able to use the internet using its own modem link.
2. VLANs should communicate with each other.
VLAN 2 - 192.168.2.0 /24, VLAN 2 interface 192.168.2.1, ADSL Modem 2 IP 192.168.2.250
VLAN 3 - 192.168.3.0 /24, VLAN 3 interface 192.168.3.1, ADSL Modem 3 IP 192.168.3.250
I do understand PC on a VLAN should use the Vlan interface IP to communicate with other VLANS but how do i do to tell a VLAN to route internet traffic through a MODEM on the VLAN not through the vlan interface.
Ive done this at the switch but i dont know how to route internet traffic PER VLAN using a defined IP at that VLAN.
SETTING UP VLAN AND VLAN INTERFACE
vlan 2
int vlan2
ip address 192.168.2.1 24
quit
vlan 3
int vlan3
ip add 192.168.3.1 24
quit
SETTING UP PORTS UNTAGGED TO DESIRED VLAN :
For those at VLAN 2
int giga1/0/1
port link-ty hybrid
port hybrid vlan 2 untagged
For those at VLAN 3
int gi1/0/13
port link-ty hy
port hy vlan 3 un
Everything is fine here with PC configuring its Default Gateway with the IP of their VLAN interface, but what about internet link i CANT hit the internet.
Plz remember i have TWO Modems, one per VLAN. MODEM 2 should connect VLAN 2, MODEM 3 should connect VLAN 3 to the internet.
One modem serving two subnets its NOT an option.
While im writting this i could imagine a DENY ACL at the switch port where the modem plugs telling smt like this pseudo but i dont know that much to configure an ACL, too dumb YET:
@modem2 port: VLAN 3 TRAFFIC IS NOT ALLOWED @ 192.168.2.250, VLAN 2 TRAFFIC COME IN
@modem3 port: VLAN 2 TRAFFIC IS NOT ALLOWED @ 192.168.3.250, VLAN 3 TRAFFIC COME IN
thanks...
The LG
