RE: Ping the subnet address

From: Guilherme Correia (razzolini80@hotmail.com)
Date: Fri Jul 02 2004 - 12:02:15 GMT-3


Ken,

The subnet ip address (172.24.18.4/30) is not on the arp table; and yes, I
can ping it from that router with a directed connected interface as well..
See the debug:
Apparently, the router is somehow changing the destination ip address for
one of the hosts on the subnet; all routers interfaces have proxy-arp
disabled..

7204-1 IP:172.24.18.6/30 <<--------->>3745 IP: 172.24.18.5/30

7204-1#ping 172.24.18.4

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.24.18.4, timeout is 2 seconds:

01:30:08: ICMP: echo reply rcvd, src 172.24.18.5, dst 172.24.18.6
Reply to request 0 from 172.24.18.5, 1 ms
01:30:10: ICMP: echo reply rcvd, src 172.24.18.5, dst 172.24.18.6
Reply to request 1 from 172.24.18.5, 1 ms
01:30:12: ICMP: echo reply rcvd, src 172.24.18.5, dst 172.24.18.6
Reply to request 2 from 172.24.18.5, 1 ms
01:30:14: ICMP: echo reply rcvd, src 172.24.18.5, dst 172.24.18.6
Reply to request 3 from 172.24.18.5, 1 ms
01:30:16: ICMP: echo reply rcvd, src 172.24.18.5, dst 172.24.18.6
Reply to request 4 from 172.24.18.5, 1 ms

any idea?

tia

From: "Kenneth Wygand" <KWygand@customonline.com>
Reply-To: "Kenneth Wygand" <KWygand@customonline.com>
To: "Ricardo Ferreira" <ricardo.ferreira@quadcomm.com.br>, "Guilherme
Correia" <razzolini80@hotmail.com>, <ccielab@groupstudy.com>
Subject: RE: Ping the subnet address
Date: Fri, 2 Jul 2004 10:16:53 -0400

Guilherme,

Check your arp cache to see what MAC address your IP address is resolving
to. Can you ping this network address from the local router that is directly
attached to this network as well?

Ken

________________________________

From: nobody@groupstudy.com on behalf of Ricardo Ferreira
Sent: Fri 7/2/2004 10:07 AM
To: Guilherme Correia; ccielab@groupstudy.com
Subject: Re: Ping the subnet address

So your question is why there's a reply to such request....
My understanding is because of the proxy arp hehaviour of the router that
will try to respond to an arp request on behalf of that 172.24.18.4 host....
So my suggestion to help u investigate this issue try to turn proxy arp off
at the routers and see what happens with the protocol analyzer and pls let
us know what happened....
But anyway that is my guess sure somebody at the group can help calrify this
issue much better than me....
----- Original Message -----
From: "Guilherme Correia" <razzolini80@hotmail.com>
To: <ricardo.ferreira@quadcomm.com.br>; <ccielab@groupstudy.com>
Sent: Friday, July 02, 2004 10:57 AM
Subject: Re: Ping the subnet address

> Hi
>
> This issue came to my attention when I used a network monitor software to
> discover the network and the subnet Ip's came up as answering the pings.
I
> dont have a connectivity issue at this point and pinging the
> network/broadcast is not my intention, but the fact is that this is
> happening and I dont know why.
>
> TIA
>
>
> From: "Ricardo Ferreira" <ricardo.ferreira@quadcomm.com.br>
> To: "Guilherme Correia"
<razzolini80@hotmail.com>,<ccielab@groupstudy.com>
> Subject: Re: Ping the subnet address
> Date: Fri, 2 Jul 2004 10:45:41 -0300
>
> Hi,
>
> 172.24.18.4/30 is the subnet address and not an address host( 172.24.18.5
> and 172.24.18.6 and 172.24.18.7 the broadcast address of such subnet
)....
> Can u pls clarify exaclty what u are trying to get....
> You should use ping to reach the hosts and even the broadcast address but
> the network address I do not see a reason for doing that....
> ----- Original Message -----
> From: "Guilherme Correia" <razzolini80@hotmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Friday, July 02, 2004 10:35 AM
> Subject: Ping the subnet address
>
>
> > Hi
> >
> > I am experiencing this weird issue that when I ping the subnet
address,
> one
> > of the routers respond.
> > For example, when I ping 172.24.18.4 (subnet 172.24.18.4/30) one of
the
> > routers with an interface on the subnet responds:
> >
> > 7204-1#ping 172.24.18.4
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 206.24.18.4, timeout is 2 seconds:
> >
> > Reply to request 0 from 172.24.18.5, 1 ms
> > Reply to request 1 from 172.24.18.5, 1 ms
> > Reply to request 2 from 172.24.18.5, 1 ms
> > Reply to request 3 from 172.24.18.5, 1 ms
> > Reply to request 4 from 172.24.18.5, 1 ms
> >
> > How can I stop this?
> >
> > TIA
> >
> > _________________________________________________________________
> > MSN Premium includes powerful parental controls and get 2 months FREE*
> >
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> >
> >



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