Ubuntu:No Route To Host

th1bill · 12-31-2011, 09:17 PM

I have a desktop and a laptop running Ubuntu 11.10 and have installed ssh on both but all I return is no route to host. Its my laptop that is trying to connect with the desktop.

camorri · 01-01-2012, 06:47 AM

You probably do not have a default route set. 'netstat -r' in a command prompt will tell you.

Quote:

netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
localnet * 255.255.255.0 U 0 0 0 eth0
loopback * 255.0.0.0 U 0 0 0 lo
default cisco 0.0.0.0 UG 0 0 0 eth0

This is from my system, the second column, 'cisco' is my router. The 'route add' command will add a default route. See this link for its use. -->http://www.cyberciti.biz/faq/linux-route-add/

What you point it at depends on the network. If you have a router, point it there. If this is a point to point config, or through a hub, create a route in each system pointing at the others IP address.

Then you should be able to ping. No more 'no route to host' message.

th1bill · 01-01-2012, 11:26 PM

Quote:

Originally Posted by camorri

You probably do not have a default route set. 'netstat -r' in a command prompt will tell you.

This is from my system, the second column, 'cisco' is my router. The 'route add' command will add a default route. See this link for its use. -->http://www.cyberciti.biz/faq/linux-route-add/

What you point it at depends on the network. If you have a router, point it there. If this is a point to point config, or through a hub, create a route in each system pointing at the others IP address.

Then you should be able to ping. No more 'no route to host' message.

Here is the return;

Quote:

willis@willis-laptop:~$ netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
default 192.168.10.1 0.0.0.0 UG 0 0 0 wlan0
link-local * 255.255.0.0 U 0 0 0 wlan0
192.168.10.0 * 255.255.255.0 U 0 0 0 wlan0

The 192.168.10.1 is my Trend Net wireless switch and is connected to my gateway, 192.168.1.254, by wire. I can connect by ssh to my laptop from the desktop but really need to connect back the other way so I can use the printer there. Thanks for the assist.

jamesf · 01-02-2012, 03:14 AM

What does netstat -r look like on the desktop?

Try doing a

Code:

hostname -f

on each machine to see if they have the same fqdn.

One more question: are you trying to ssh by name or ip address? Are they both using ipv4 or is one ipv4 and one ipv6?

camorri · 01-02-2012, 08:17 AM

When I first answered your post, I had no idea you had a switch with routing capability.

Are the desktop and laptop on the same, or different sub-nets? Is it possible to define a static router between the two?

th1bill · 01-03-2012, 12:33 AM

Quote:

Originally Posted by jamesf

What does netstat -r look like on the desktop?

Try doing a.

Code:

hostname -f

on each machine to see if they have the same fqdn.

One more question: are you trying to ssh by name or ip address? Are they both using ipv4 or is one ipv4 and one ipv6?

I am currently on wire for both and still trying to find an answer. These results are under this config. and from the desktop it reads willis-MS-7309
willis@willis-laptop:~$ hostname -f
willis-laptop
willis@willis-laptop:~$

th1bill · 01-03-2012, 12:40 AM

Quote:

Originally Posted by camorri

When I first answered your post, I had no idea you had a switch with routing capability.

Are the desktop and laptop on the same, or different sub-nets? Is it possible to define a static router between the two?

when they are both on wire they are on the same switch but when I go wireless the wireless switch is plugged into the 8 port wired switch placing another switch into the mix.

sorry for not being clear enough, you would think that after doing computers since the VIC 20 and having become a legal senior citizen I should have learned by now... must be getting feeble minded to match my body.

overprotected · 01-03-2012, 04:13 AM

Can you netstat -r from desktop and paste the result here?

th1bill · 01-03-2012, 11:36 PM

Quote:

Originally Posted by overprotected

Can you netstat -r from desktop and paste the result here?

Quote:

willis@willis-MS-7309:~$ netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
default 192.168.10.1 0.0.0.0 UG 0 0 0 eth0
link-local * 255.255.0.0 U 0 0 0 eth0
192.168.10.0 * 255.255.255.0 U 0 0 0 eth0
willis@willis-MS-7309:~$

I hope this helps

overprotected · 01-04-2012, 03:18 AM

Quote:

Originally Posted by th1bill

I hope this helps

Can you connect both the laptop and the desktop to a Switch through a wire and then try to ping laptop to desktop and vice versa?

PS: Use IP instead of hostname when you ping.