From: Erick (erickbe@xxxxxxxxx)
Date: Sat Apr 22 2000 - 19:34:49 GMT-3
With classful routing, if theres a directly connected
network that matches the destination you're attempting
to get to the router will use these directly connected
networks. The packet will be dropped if one of the
directly connected networks doesn't match the
destination. Other routes in the table will not be
looked at.
Classless routing needs to be enabled to use other
routes in the table.
--- Aaron DuShey <adushey@yahoo.com> wrote:
> do you have ip classless configured? If not, you the
> router if seeing a
> match for the classfull network, then looking for a
> subnet of 137.20.x.x.
> When not finding the .60 subnet, it will drop the
> packet. IP classless
> allows the router to match the closest supernet if
> no subnet match is found,
> in this case the candidate default of 200.x.x.x.
> notice link-
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/n
> p1_r/1ripadr.htm#xtocid2512611
>
> Aaron DuShey-GE Capital Net Solutions
> Consulting Systems Engineer
> (760)500-1707
> CCNP - CNX - MCSE - CNE - Citrix Specialist - ASE-
> HP Star
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> Nnanna Obuba
> Sent: Saturday, April 22, 2000 9:23 AM
> To: Hedlund, Brad; 'Michael Needham';
> CCIELAB@groupstudy.com
> Subject: ip default network puzzle
>
>
>
> Hi all,
>
> I wonder if any one could give me a clue as to
> what's happening here..
> I have configured igrp with an ip
> default-network..but each time I try to
> ping an 'unknown' network (with debug ip packet on)
> I get an 'unroutable'
> message.
> Here's the routing table + error message.
>
> TIA
>
> Nnanna
>
>
> Gateway of last resort is 137.20.200.17 to network
> 200.200.200.0
>
> I 172.168.0.0/16 [100/8576] via 137.20.200.17,
> 00:00:35, Serial0
> 137.20.0.0/28 is subnetted, 2 subnets
> C 137.20.200.16 is directly connected, Serial0
> C 137.20.40.16 is directly connected,
> Ethernet0
> I* 200.200.200.0/24 [100/8576] via 137.20.200.17,
> 00:00:35, Serial0
>
>
>
> r4#ping 137.20.60.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 137.20.60.1,
> timeout is 2 seconds:
> .....
> Success rate is 0 percent (0/5)
> r4#
> IP: s=137.20.40.17 (local), d=137.20.60.1, len 100,
> unroutable
> IP: s=137.20.40.17 (local), d=137.20.60.1, len 100,
> unroutable
> IP: s=137.20.40.17 (local), d=137.20.60.1, len 100,
> unroutable
> IP: s=137.20.40.17 (local), d=137.20.60.1, len 100,
> unroutable
> IP: s=137.20.40.17 (local), d=137.20.60.1, len 100,
> unroutable
>
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:23:15 GMT-3