tun interface address conflict

[Max Laier]

On Friday 03 December 2004 18:19, Giovanni P. Tirloni wrote:
> Hi,
>
>   I tried to connect two ADSL lines from the same telco using ppp but
> it breaks when setting the second interface. The problem seems an
> address conflict between them, like this:
>
> # ifconfig tun1 192.168.100.1 192.168.100.254 netmask 255.255.255.255
> # ifconfig tun2 192.168.100.2 192.168.100.254 netmask 255.255.255.255
> ifconfig: ioctl (SIOCAIFADDR): File exists
>
>   "File exists" is the same error that I find on /var/log/ppp.log. Is
> there anything that can be done to use both at the same time?

As a quick fix you can just delete the route table entry created from tun1 
before you ifconfig tun2. In your example you'd do:
 # route delete 192.168.100.254
Of course you have to take care of the routing for yourself.

Alternatively (assumeing you are on RELENG_5) you can try to apply the 
following patch:
   http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/in.c.diff?r1=1.77&r2=1.80
to src/sys/netinet/in.c which should fix the problem altogether. Please tell 
me if you have troubles with it as I am going to MFC this shortly.

-- 
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