Re: diffrent Subnet IPs on same VLAN and Proxy-Arp

From: Fahad Khan (fahad.khan@gmail.com)
Date: Tue Oct 21 2008 - 04:52:04 ARST

Raheel,

Which IOS are you using? There should not be any problem in doing so. After
configuring static route, outgoing interface is defined for both R1 and R2;
very straight forward. I labbed this scenario before and I didnt have any
problem. are you simulating this on Dynamips??

Best regards,

On 10/21/08, Raheel Itrat <syedraheel@gmail.com> wrote:
>
> Michael
>
> There are 3 devices in total two routers connected to the same switch.( I
> mistakenly wrote BB1...there is no BB1). I have tried enabling local proxy
> arp as well....but still getting the encaps failed message... Below is the
> config
>
> R1:
> int e0
> ip local-proxy-arp
> ip address 101.1.1.1 255.255.255.0
> ip route 102.1.1.1 255.255.255.255 e0
>
> R2:
> int e0
> ip local-proxy-arp
> ip address 102.1.1.1 255.255.255.0
> ip route 101.1.1.1 255.255.255.255 e0
>
> SW1:
> int e1/1
> switch mode acc
> switch acc vlan 10
> int e1/2
> switch mode acc
> switch acc vlan 10
>
>
> On Tue, Oct 21, 2008 at 12:30 AM, Michael Dorion <dorionm@gmail.com>
> wrote:
>
> > The example is a little confusing without configs. Looks like you listed
> 4
> > device but only 2 IPs and no masks. But to do proxy-arp on the same
> > interface, the router needs to have local proxy arp enable. This is not
> > enabled by default, and you can verify with the "sho ip interface
> > <interface>" command. You should see proxy arp enabled but not local
> proxy
> > arp. The router would also need a route to the destination, or a wider
> mask.
> >
> >
> > On Mon, Oct 20, 2008 at 2:05 PM, <syedraheel@gmail.com> wrote:
> >
> >> Hi!
> >> While doing some labing I came accross an interesting scenario,,,,
> >>
> >> R1 and BB1 are connected to the same switch SW1 in same vlan 10. But the
> >> IPs of
> >> their interfaces which connect to the switch are of different subnets
> like
> >> 101.1.1.1 and 102.1.1.1
> >>
> >> its like R1(e0)-----(e1/1)SW1(e1/2)-----(e0)R2 , where e1/1 and e1/2 are
> >> configured in the same access vlan10
> >>
> >> Now, I cant ping between the two router interfaces, I set a static route
> >> 102.1.1.1 255.255.255.255 e0 on R1 and similarly a route back on
> >> R2.......I
> >> still see encapsulation failed on the debug.
> >>
> >> So whats happening is that when its arping for the destination address
> its
> >> not
> >> getting a reply back with a mac-address rite?...
> >>
> >> Can anyone explain this behaviour? How can I enable communication
> between
> >> the
> >> two routers?
> >>
> >> May be its too simple for a ccie forum ....but still we tend to forget
> the
> >> basics while studying for advance topics sometimes
> >>
> >>
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> >>
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-- 
Fahad Khan

Blogs and organic groups at http://www.ccie.net

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