[c-nsp] HSRP

[Pawlowski, Maciej]

Do you see correct mac addresses and arp entries on the host ?

Cheers,

Maciek


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mohammad Khalil
Sent: Thursday, June 09, 2011 3:29 PM
To: p.mayers at imperial.ac.uk; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] HSRP


I am trying from the same hosts connected to the HSRP

> Date: Thu, 9 Jun 2011 13:37:40 +0100
> From: p.mayers at imperial.ac.uk
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] HSRP
> 
> On 09/06/11 13:28, Mohammad Khalil wrote:
> >
> > hi
> >
> > i have configured HSRP between 2 7606-S and an ASN Gateway the 
> > standby group is up and one of the routers is active and the other 
> > one is standby the issue , i cannot ping the HSRP virtual IP address 
> > or the configured IP addresses under the vlan interface
> 
>  From where? What can't ping it?
> 
> > is that normal ?
> 
> Perhaps. It depends on your config.
> 
> uRPF often causes these packets to drop, because each router 
> advertises the subnet, so for example in the following topology:
> 
> host ---- router1 ---<link> --- router2
>   192.0.1.2  |                     | 192.0.1.3
>              \---- <192.0.1.1> ----/
> 
> If "host" tried to ping 192.0.1.3, the packet would be received by 
> router1, emitted into the HSRP subnet, arrive at router2 with:
> 
>   src=host
>   dst=192.0.1.3
> 
> ...and fail the RPF check
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