Proxy ARP Interesting

[sachin]

Scenerio is like this --

L3 Router(6509)

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Interface Vlan1

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192.168.1.x/24 Primary IP

10.3.3.1/24 secondary IP

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|---10.3.3.2/24-----7200Router---192.168.1.y/24

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I have added static routes on 6509 for 192.168.1.y IPs reachable through 10.3.3.2.Now the problem is I am not able to reach machines with IPs 192.168.1.x to machines 192.168.1.y until I add static routes in machine itself.I am able to reach any of IP of 192.168.1.y from 10.3.3.x IPs.

Now my question it should work without adding static routes on machine with the Proxy ARP feature enabled on routers.

As earlier it was working but only change was Cisco 3660 router is replaced L3 Router 6509.

Is there any difference with proxy arp functioning when it comes to Software interface( interface Vlan 1) and hardware interface (interface fastEthernet 0) ?

I also understand that Proxy ARP will reply only when if the request is coming on other interfaces. But how it was working with Cisco 3600 router (interface fastEthernet 0).

Is there any solution for this problem ?

Thanks,

[dnewell24]

To what machines and what static routes did you add for this to start working?

How was the 3660 connected to the LAN before?

Can you post the irrelevant configuration for the 6500 (MSFC and CATOS) and 7200 and the routing table for both routers?

Ryan

[magruder58]

Does the 7200 has the same network as the 6500(192.168.1.xy /24)?

If you have a Layer 3 Switch you can create another vlan for the 7200.

interface Vlan1

ip address 192.168.1.x 255.255.255.0

interface Vlan2

description 7200 interface 1

ip address 10.3.3.1 255.255.255.0

interface Vlan3

description 7200 interface 2

ip address 192.168.2.x 255.255.255.0

The 7200 needs a unique network (192.168.2.x /24) if the 6500 is going to be able to access it.

L3 6509

| | |

| | |

Vlan1 Vlan2 Vlan3

| | |

7200 7200

int1 int2

[sachin]

yes 7200 has the same network as of the 6500 (192.168.1.xy/24).It is discontinuous subnet.

I also thought of this solution. But why it has been working with Cisco 3600 router without any vlan ? Problem started once we replaced Cisco 3600 router with L3 Router 6509.

[forsudhaji]

To find the real cause of the issue, instead of VLAN 1 give the pri and Sec IP to the FE Interface of the L3 switch itself and chk.

IMHO, the packet destined to 192.168.1.y/24 from a PC 192.168.1.x/24 will not come to default gateway at all and hence u find no reachability.