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Date:      Tue, 5 Jun 2001 11:34:19 -0700 (PDT)
From:      bannai@pacbell.net
To:        freebsd-gnats-submit@FreeBSD.org
Subject:   kern/27891: Cannot assign a IP address to a interface when a route to the same subnet exists in the routing table
Message-ID:  <200106051834.f55IYJL18409@freefall.freebsd.org>

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>Number:         27891
>Category:       kern
>Synopsis:       Cannot assign a IP address to a interface when a route to the same subnet exists in the routing table
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jun 05 11:40:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Vinay Bannai
>Release:        4.2
>Organization:
Luminous Networks
>Environment:
FreeBSD ernestbsd.luminousnetworks.com 4.2-RELEASE FreeBSD 4.2-RELEASE #0: Mon Nov 20 13:02:55 GMT 2000     jkh@bento.FreeBSD.org:/usr/src/sys/compile/GENERIC  i386

>Description:
When assigning a IP address to a interface, you get a error when a route to the
same subnet already exists in the routing table. This can happen usually 
when running OSPF (or any routing protocol) when a route is learnt from
a neighbor. This populates the kernel routing table.

At a later stage when you add a interface on the subnet that is learnt from 
the neighbor, you get a error. We tried this by using a static route. I am not
sure if using a static route causes this problem.
>How-To-Repeat:
- Add a static route to the kernel routing table (eg. 172.16.0.0/16)
- Set the IP address of a interface (eg 172.16.100.10)

This causes the ifconfig to fail
>Fix:
I am not sure, but could this be related to using a static route. I will 
try with a dynamic routing protocol..

>Release-Note:
>Audit-Trail:
>Unformatted:

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