misc/89979: PPPoE server permit two clients with the same ip address

Frederico Boechat fboechat at yahoo.com
Mon Dec 5 16:10:27 GMT 2005

>Number:         89979
>Category:       misc
>Synopsis:       PPPoE server permit two clients with the same ip address
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 05 16:10:02 GMT 2005
>Originator:     Frederico Boechat
>Release:        FreeBSD 6.0
FreeBSD kukimata.mar.com.br 6.0-STABLE FreeBSD 6.0-STABLE #0: Mon Dec  5 13:39:58 BRST 2005     root at kukimata.mar.com.br:/usr/obj/usr/src/sys/SMP  i386              
We serve PPPoE connections to our wireless clients. The configuration files are the same of our FreeBSD 4.11 PPPoE server. But often we have two or more clients with different tunnels and the same ip address. The ip are dinamically distributed by PPPoE service. In the 4.11, I don´t have this problem, the server reject the connection if the client gave the same ip address of other client.              
set the same ip address in two different logins and then try to connect both...in 4.x series they cannot connect, but in the 5.x and 6.x series, they connect but none of them can ping to no one place.              
I dont´know how to fix this problem. I just know the 4.x series don´t have this bug. I´m not a good C programming...rs               

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