ping request timeout on LAN

I don't know how to correct or edit the question. I want to connect to a Ubuntu server on the local NETWORK over ssh.

m is a short domain in the hosts file on my mac. It's ip is 192.168.0.13 as you can see it in the ping log.

When I ping for a longer time I get an other message:

Request timeout for icmp_seq 198

ping: sendto: Host is down

Request timeout for icmp_seq 199

ping: sendto: Host is down

Request timeout for icmp_seq 200

ping: sendto: Host is down

Request timeout for icmp_seq 201

Request timeout for icmp_seq 202

In these cases below I removed the m and used the IP address of the server. On the macbook I'm using MacOSX, on the lenovo I'm using Ubuntu 14.04.

I think the underlying cause is on the Mac, because the ping and the ssh is working on the lenovo. Any idea what can be the underlying cause? (The firewall on the mac is Off).

on the macbook:

janos@macbook:~/work/anpr$ ping 192.168.0.13

PING 192.168.0.13 (192.168.0.13): 56 data bytes

Request timeout for icmp_seq 0

Request timeout for icmp_seq 1

Request timeout for icmp_seq 2

Request timeout for icmp_seq 3

Request timeout for icmp_seq 4

ping: sendto: No route to host

Request timeout for icmp_seq 5

^C

--- 192.168.0.13 ping statistics ---

7 packets transmitted, 0 packets received, 100.0% packet loss

janos@macbook:~/work/anpr$ ssh 192.168.0.13

ssh: connect to host 192.168.0.13 port 22: Operation timed out

---

on an other laptop:

janos@lenovo:~$ ping 192.168.0.13

PING 192.168.0.13 (192.168.0.13) 56(84) bytes of data.

64 bytes from 192.168.0.13: icmp_seq=1 ttl=64 time=63.2 ms

64 bytes from 192.168.0.13: icmp_seq=2 ttl=64 time=86.4 ms

64 bytes from 192.168.0.13: icmp_seq=3 ttl=64 time=8.11 ms

64 bytes from 192.168.0.13: icmp_seq=4 ttl=64 time=29.7 ms

64 bytes from 192.168.0.13: icmp_seq=5 ttl=64 time=53.0 ms

64 bytes from 192.168.0.13: icmp_seq=6 ttl=64 time=175 ms

^C

--- 192.168.0.13 ping statistics ---

6 packets transmitted, 6 received, 0% packet loss, time 5004ms

rtt min/avg/max/mdev = 8.118/69.280/175.041/53.358 ms

janos@lenovo:~$ ssh 192.168.0.13

You have new mail.

Last login: Wed Sep 23 23:38:30 2015 from 192.168.0.12

How can I boot into recovery mode?

I found this in my Routing tables. What do you think, is there a problem with this?

Internet:

Destination Gateway Flags Refs Use Netif Expire

default 192.168.0.1 UGSc 22 0 en1

127 localhost UCS 0 0 lo0

localhost localhost UH 6 6269 lo0

169.254 link#5 UCS 0 0 en1

192.168.0 link#5 UCS 1 0 en1

192.168.0.1/32 link#5 UCS 1 0 en1

192.168.0.1 ca:11:22:33:44:55 UHLWIir 24 116 en1 166

192.168.0.11/32 link#5 UCS 0 0 en1

m link#5 UHRLWI 0 2574 en1 16

Do you know what is link#5 in it? I can't delete it.

janos@macbook:~$ sudo route delete m link#5

route: bad address: link#5

janos@macbook:~$ sudo route delete m 'link#5'

route: bad address: link#5

janos@macbook:~$ sudo route delete m

route: writing to routing socket: not in table

delete host m: not in table

I rebooted into recovery mode and it didn't changed anything. After it I rebooted into normal mode and there wasn't default route, so I didn't had internet connection and I couldn't add it with the "route add default 192.168.0.1" command. I rebooted into normal mode again and there is internet and a default route again.

I was pinging

192.168.0.18

route delete m

192.168.0.13

ssh m