routing - ssh connection sometimes prints "No route to host", other times it connects normally -


i have 2 laptops : - first debian squeeze , connected via ethernet , has ip address 192.168.0.2 - second ubuntu 12.10 connected via wlan , has ip address 192.168.0.9

the problem is: - if try use ssh first second result :

laptop1@192.168.0.2:~$ ssh laptop2@192.168.0.9 "ssh : connect host 192.168.0.9 port 22: no route host "

  • if try use ssh second first , connects first.

    laptop2@192.168.0.9:~$ ssh laptop1@192.168.0.1

  • and if try again connect first second , connects second

    laptop1@192.168.0.2:~$ ssh laptop2@192.168.0.9

but after few minutes if try use ssh first second , still result :

"ssh : connect host 192.168.0.9 port 22: no route host ".

typing command arp on laptop1 noticed cannot connect laptop1 laptop2 when disappears ip address of laptop2.

laptop1@192.168.0.2:~$ sudo arp  address       hwtype   hwaddress        flags  mask  iface 192.168.0.1   ether   00:1b:2f:3f:b5:a2   c           eth0 192.168.0.9   ether   e4:d5:3d:03:3b:ed   c           eth0

after few minutes...

laptop1@192.168.0.2:~$ sudo arp  address       hwtype   hwaddress        flags  mask  iface 192.168.0.1   ether   00:1b:2f:3f:b5:a2   c           eth0

someone understands why happens? , how can fix it?

i post more information of 2 laptops:

  • for laptop1:

    laptop1@192.168.0.2:~$ sudo ifconfig eth0      link encap:ethernet  hwaddr 20:cf:30:08:e0:82     inet addr:192.168.0.2  bcast:192.168.0.255  mask:255.255.255.0   inet6 addr: fe80::22cf:30ff:fe08:e082/64 scope:link   broadcast running multicast  mtu:1500  metric:1   rx packets:29290 errors:0 dropped:0 overruns:0 frame:0   tx packets:28325 errors:0 dropped:0 overruns:0 carrier:0   collisions:0 txqueuelen:1000    rx bytes:20301572 (19.3 mib)  tx bytes:11035023 (10.5 mib)   interrupt:30   lo        link encap:local loopback     inet addr:127.0.0.1  mask:255.0.0.0   inet6 addr: ::1/128 scope:host   loopback running  mtu:16436  metric:1   rx packets:1440 errors:0 dropped:0 overruns:0 frame:0   tx packets:1440 errors:0 dropped:0 overruns:0 carrier:0   collisions:0 txqueuelen:0    rx bytes:166450 (162.5 kib)  tx bytes:166450 (162.5 kib)  wlan0     link encap:ethernet  hwaddr 74:f0:6d:76:79:93     inet6 addr: fe80::76f0:6dff:fe76:7993/64 scope:link   broadcast multicast  mtu:1500  metric:1   rx packets:42 errors:0 dropped:0 overruns:0 frame:0   tx packets:81 errors:0 dropped:0 overruns:0 carrier:0   collisions:0 txqueuelen:1000    rx bytes:10888 (10.6 kib)  tx bytes:16236 (15.8 kib)    laptop1@192.168.0.2:~$ sudo route -n kernel ip routing table destination     gateway         genmask         flags metric ref    use iface 192.168.0.0     0.0.0.0         255.255.255.0   u     1      0        0 eth0 169.254.0.0     0.0.0.0         255.255.0.0     u     1000   0        0 eth0 0.0.0.0         192.168.0.1     0.0.0.0         ug    0      0        0 eth0

  • for laptop2:

    laptop2@192.168.0.9:~$ sudo ifconfig eth0      link encap:ethernet  hwaddr 04:7d:7b:1e:47:8b     broadcast multicast  mtu:1500  metric:1   rx packets:0 errors:0 dropped:0 overruns:0 frame:0   tx packets:0 errors:0 dropped:0 overruns:0 carrier:0   collisions:0 txqueuelen:1000    rx bytes:0 (0.0 b)  tx bytes:0 (0.0 b)  lo        link encap:local loopback     inet addr:127.0.0.1  mask:255.0.0.0   inet6 addr: ::1/128 scope:host   loopback running  mtu:16436  metric:1   rx packets:124 errors:0 dropped:0 overruns:0 frame:0   tx packets:124 errors:0 dropped:0 overruns:0 carrier:0   collisions:0 txqueuelen:0    rx bytes:10373 (10.3 kb)  tx bytes:10373 (10.3 kb)  wlan0     link encap:ethernet  hwaddr e4:d5:3d:03:3b:ed     inet addr:192.168.0.9  bcast:192.168.0.255  mask:255.255.255.0   inet6 addr: fe80::e6d5:3dff:fe03:3bed/64 scope:link   broadcast running multicast  mtu:1500  metric:1   rx packets:1434 errors:0 dropped:0 overruns:0 frame:0   tx packets:1329 errors:0 dropped:0 overruns:0 carrier:0   collisions:0 txqueuelen:1000    rx bytes:1274245 (1.2 mb)  tx bytes:188474 (188.4 kb)    laptop2@192.168.0.9:~$ sudo route -n kernel ip routing table destination     gateway         genmask         flags metric ref    use iface 0.0.0.0         192.168.0.1     0.0.0.0         ug    0      0        0 wlan0 169.254.0.0     0.0.0.0         255.255.0.0     u     1000   0        0 wlan0 192.168.0.0     0.0.0.0         255.255.255.0   u     9      0        0 wlan0


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