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I have a wireless router (buffalo airstation) and several boxes connected to it by wire. I can ssh between them, e.g.:

box1$ ssh box2

if, however, box1 is connected wirelessly, ssh box2 fails with No route to host. (ssh, wget, firefox &c to the internet work fine with both wireless and wired connections). ping box2 fails with Destination Host Unreachable. (name box2 is resolved to the correct IP address by both ping and ssh, probably because they are specified in /etc/hosts).

when box1 is connected by wire ifconfig prints:

eth0      Link encap:Ethernet  HWaddr 00:90:f5:80:d8:dc  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::290:f5ff:fe80:d8dc/64 Scope:Link


wlan0     Link encap:Ethernet  HWaddr 00:21:5c:46:e6:a5  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::221:5cff:fe46:e6a5/64 Scope:Link

note that this is for the client box1 which initiates the connection; the server box2 which is pinged is always wired:

eth0      Link encap:Ethernet  HWaddr 00:50:ba:c8:0d:c7
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::250:baff:fec8:dc7/64 Scope:Link

Again, note that both wired and wireless connections work perfectly when accessing the internet behind the the router.

So, how come I cannot connect to the wired box2 from wireless box box1?

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Can you post a netstat -rn from box when connected by wireless? – Paul Sep 23 '11 at 6:00

Check the settings on your router, look in the wireless setup, or advanced wireless setup, look for an option possibly named "WLAN Partitioning". (my DIR-655 has this) It prevents wireless systems from seeing or contacting any other computers on the router. So wired machines see each other, but wireless machines are 'partitioned' off and prevented from talking except to internet.

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on my buffalo airstation I unchecked the box "Separate feature" under "wireless config"/"basic" and it works now! – sds Sep 23 '11 at 22:30

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