What does:
ip addr show
shows?
Is there a cble plugged to that interface?
ET 

Mark Phillips writes: 

> My Debian testing laptop running gnome has two interfaces - eth0 and wlan0.
> When I switch to wlan0, the routing table has an entry for eth0, so I
> cannot access my local network. 
> 
> root@orca:/home/mark# route
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> default         gateway         0.0.0.0         UG    0      0        0
> wlan0
> link-local      *               255.255.0.0     U     1000   0        0
> wlan0
> 192.168.25.0    *               255.255.255.0   U     0      0        0 eth0
> 192.168.25.0    *               255.255.255.0   U     0      0        0
> wlan0 
> 
> if I remove the eth0 line, I can connect to my local lan. 
> 
> How do I permanently remove this route? I can do it manually with route del
> -net....., but that does not survive reboot. I have no idea where this
> setting is created. 
> 
> When I switch to eth0 (ie plug in a cable), I get this routing table, which
> is correct. 
> 
> root@orca:/etc/network# route
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> default         gateway         0.0.0.0         UG    0      0        0 eth0
> link-local      *               255.255.0.0     U     1000   0        0 eth0
> 192.168.25.0    *               255.255.255.0   U     0      0        0 eth0 
> 
> Thanks, 
> 
> Mark
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