Invalid 'route change' functioning

[Ruslan Ermilov]

On Mon, Jan 17, 2005 at 06:08:38PM +0300, Vladimir Grebenschikov wrote:
> Hi
> 
> I am try to do following thing - configure another interface with same
> address on same broadcast segment (but wired) and then change route
> entry from one interface to another:
> 
> 
> # ifconfig iwi0
> iwi0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.1.111 netmask 0xfffffe00 broadcast 192.168.1.255
>         ether 00:0e:35:03:82:74
>         media: IEEE 802.11 Wireless Ethernet autoselect (OFDM/54Mbps)
>         status: associated
> 	...
> # netstat -rn
> Routing tables
> 
> Internet:
> Destination        Gateway            Flags    Refs      Use  Netif Expire
> default            192.168.1.1        UGS         0   511183   iwi0
> 127.0.0.1          127.0.0.1          UH          1      626    lo0
> 192.168.0/23       link#3             UC          0        0   iwi0
> 192.168.1.111      127.0.0.1          UGHS        0        0    lo0
> 192.168.1.255      ff:ff:ff:ff:ff:ff  UHLWb       0        1   iwi0
> #
> 
> All is ok so far, then configure same address on another interface (not wireless):
> 
> # ifconfig fxp0 192.168.1.111/23
> # ifconfig fxp0 
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         options=8<VLAN_MTU>
>         inet 192.168.1.111 netmask 0xfffffe00 broadcast 192.168.1.255
>         ether 08:00:46:c8:45:b3
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> 
> Ok, routing not changed, now I whant to change route entry 192.168.0/23 -> iwi0, to 192.168.0/23 -> fxp0
> 
> # route change 192.168.0/23 -iface fxp0 -cloning 
> change net 192.168.0: gateway fxp0
> #
> 
> looks like ok, but:
> 
> # netstat -rn
> Routing tables
> 
> Internet:
> Destination        Gateway            Flags    Refs      Use  Netif Expire
> default            192.168.1.1        UGS         0   511317   iwi0
> 127.0.0.1          127.0.0.1          UH          1      661    lo0
> 192.168.0/23       link#3             UC          0        0   iwi0
> 192.168.1.111      127.0.0.1          UGHS        0        0    lo0
> #
> 
> nothing changed, delete + add works as expected:
> 
> # route delete 192.168.0/23 && route add 192.168.0/23 -iface fxp0 -cloning
> delete net 192.168.0
> add net 192.168.0: gateway fxp0
> # netstat -rn
> Routing tables
> 
> Internet:
> Destination        Gateway            Flags    Refs      Use  Netif Expire
> default            192.168.1.1        UGS         0   511336   iwi0
> 127.0.0.1          127.0.0.1          UH          1      663    lo0
> 192.168.0/23       link#1             UCS         0        0   fxp0
> 192.168.1.111      127.0.0.1          UGHS        0        0    lo0
> #
> 
> (default still goes through wireless, as expected)
> 
> Any ideas what wrong with 'route change' ? 
> 
The route(8) manpage says:

: In a change or add command where the destination and gateway are not suf-
: ficient to specify the route (as in the ISO case where several interfaces
: may have the same address), the -ifp or -ifa modifiers may be used to
: determine the interface or interface address.

So try this instead:

route change 192.168.0/23 -ifp fxp0


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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