From: Antonio Soares (amsoares@netcabo.pt)
Date: Thu Sep 06 2007 - 11:52:36 ART
That will be true if the backbone routers have not been configured to avoid
it. For example, try to add this config to you BB router:
++++++++++++++++++++++++
!
interface Ethernet0
ip address xxx.xxx.xxx.xxx 255.255.255.0
ip access-group 101 in
no ip unreachables
no ip proxy-arp
no cdp enable
!
access-list 101 deny icmp any 0.0.0.255 255.255.255.0
access-list 101 deny icmp any 0.0.0.0 255.255.255.0
access-list 101 deny icmp any 0.0.255.255 255.255.0.0
access-list 101 deny icmp any 0.0.0.0 255.255.0.0
access-list 101 deny icmp any 0.255.255.255 255.0.0.0
access-list 101 deny icmp any 0.0.0.0 255.0.0.0
access-list 101 permit ip any any
!
++++++++++++++++++++++++
I had this question in the past and the only solution i know is via tcl
scripts. Of course, it will be feasible for /24 or less networks.
Regards,
Antonio Soares
CCIE #18473, CCNP, CCIP
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Bit
Gossip
Sent: quarta-feira, 5 de Setembro de 2007 13:03
To: ccielab@groupstudy.com
Subject: Re: how to identify host ip from routes comming from Backbone
Usually I ping the network address, usually the router with an interface
configured for this network replies.
Bit.
R6#show ip bgp
BGP table version is 11, local router ID is 54.1.2.6 Status codes: s
suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 28.119.16.0/24 54.1.2.254 0 54 i
*> 28.119.17.0/24 54.1.2.254 0 54 i
*> 112.0.0.0 54.1.2.254 0 0 54 50 60 i
*> 113.0.0.0 54.1.2.254 0 0 54 50 60 i
*> 114.0.0.0 54.1.2.254 0 0 54 i
*> 115.0.0.0 54.1.2.254 0 0 54 i
*> 116.0.0.0 54.1.2.254 0 0 54 i
*> 117.0.0.0 54.1.2.254 0 0 54 i
*> 118.0.0.0 54.1.2.254 0 0 54 i
*> 119.0.0.0 54.1.2.254 0 0 54 i
R6#debug ip icmp
ICMP packet debugging is on
R6#ping 28.119.16.0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 28.119.16.0, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 76/76/77 ms R6#
*Mar 2 06:58:14.923: ICMP: echo reply rcvd, src 172.16.4.3, dst 54.1.2.6
*Mar 2 06:58:15.003: ICMP: echo reply rcvd, src 172.16.4.3, dst 54.1.2.6
R6#ping 112.0.0.0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 112.0.0.0, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/16 ms R6#
*Mar 2 07:00:50.293: ICMP: echo reply rcvd, src 54.1.2.254, dst 54.1.2.6
----- Original Message -----
From: "NITIN NITIN" <ccie_study_123@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Friday, August 31, 2007 8:01 PM
Subject: how to identify host ip from routes comming from Backbone
> Hi Experts ,
>
> please suggest -----
>
> IF in lab I have routes comming from BB routers --- Now to check
> connectivity to those ips
> like 1.1.1.0/24
>
> Which host ip to ping ???? how to identify that ???
>
>
>
>
> ---------------------------------
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This archive was generated by hypermail 2.1.4 : Sat Oct 06 2007 - 12:01:09 ART