Archive for August, 2010

Hostname X is not a legal LAT node name

Posted on August 23, 2010. Filed under: cisco ios, Uncategorized | Tags: |

Interesting error message occurred when changing host name on a Cisco router, 1841:

old-router-name-is-here(config)#hostname my-new-router-name-here
% Hostname "MY-NEW-ROUTER-          " is not a legal LAT node name, Using "CISCO_CADD00"
my-new-router-(config)#

If the host name being configured is longer than sixteen characters the router will advise that it will use a new host name, however the configuration will still display the one that you intended to use.

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IOS Object Groups

Posted on August 18, 2010. Filed under: cisco ios | Tags: , |

The feature is first available in IOS version 12.4.20T, more information can be found here http://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/sec_object_group_acl.html

Simplifies ACL configuration (and QoS, or other features), by grouping networks or services, e.g.

permit tcp object-group source-networks host 10.1.1.1 eq www 8080
!
object-group network source-networks
 host 10.1.99.1
 network 192.168.1.0 /24
 range 172.16.1.1 172.16.1.5

Object-groups can also be used to group services (protocols), e.g.

permit tcp object-group service-ip-telephony object-group source-networks host 10.1.1.1 eq www 8080
!
object-group service service-ip-telephony
permit udp eq tftp
permit tcp eq www 2000
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