Inter Vlan Routing

5 pts.
Tags:
Cisco 3750
Cisco Routers
Cisco switches
DHCP
Proxy server
Subinterface
VLAN configuration
Wireless in 2010
Hello. I have 5 vlans working on my network i.e 192.168.80.0, 81.0, 82.0, 83.0, 84.0, 85.0 . i have one core switch where all L2 switches are connected. and router is connected with L2 switch. caz its in another building so cant connect with L3 3750 switch. and i have configured 5 subinterfaces in routers and all clients has DG of its own vlan subinterface router. i have dhcp server in my vlan 81.0 . i have also configured helper address whcih is pointed to that DHCP server in 81.0 . my proxy server address is 81.20 . now the question is this that how could my clients from other vlans use internet from proxy server. caz for proxy server it must be DG. and for inter vlan routing the DG must be routers subinterface. plz help me in this regard if someone could. thanx in advance

Software/Hardware used:
Cisco Router 2621, CIsco Switch 3750

Answer Wiki

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This depends on the proxy server in use. “easiest” way is to set the proxy address in clients browsers, either hardcoded, or BETTER by having them load a proxy.pac (a little more work up-front, but the first time you have to change something you’ll realize the value of a .pac file).

Within the proxy.pac, basically determine if the address is internal or not. If internal, go direct. If not, then send traffic to the proxy server.

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