Re: [Gumstix-users] gumstix-users Digest, Vol 30, Issue 36

[Bill C. <bcu...@oc...>]

"No route to host" is a routing/network issue, so that's where you have
to look.  (instead of a nameserver thing)

This troubleshooting needs to be done on both sides of the cable (on
your gumstix and on your debian host).

1) is your usb network interface kernel modules loaded?
 - if you see your usb device in the output of ifconfig, you should be
ok, otherwise figure out how to do that (look for
modprobe/insmod/modules.conf inside any usbnet documentation you may
have)

2) are the two interfaces seeing each other?
  - I'm not familiar with the usbnet driver, but it probably has a way
of knowing that there's something on the other side.  Look at the output
of 'dmesg' or 'tail /var/log/messages' immediately after plugging the
cable.  This might also tell you if the other guy's network module isn't
loaded properly.

3) is your interface setup correctly?  
 - again, with the ifconfig command, you can figure this out : ip
address, network mask, and if the interface is "up" or not.

4) routing
4a) is this the only interface on the 192.168.0.x network? (look at the
output of '/sbin/ifconfig')
  - if not, choose another network (i.e. 192.168.1.x), or change the
other interfaces.
4b) extra routes?
 - if you don't know about this, then this probably isn't the problem,
but just in case:
 - "/sbin/route -n" will give you a hint here:
 You should only have one route for that ip/netmask combination : in
other words, that interface should be the preferred way to the
192.168.0.x network.
 If you have an interface setup for 192.168.0.0/255.255.0.0 and this one
is setup for 192.168.0.0/255.255.255.0, you're ok, but if there's
another 192.168.0.x/255.255.255.x, you need to fix stuff here.  If this
is where you are and can't figure it out, send the output of
'/sbin/route -n' on both your gumstix and debian host.  More than likely
I'd tell you to use another network ip/mask for your usb interfaces
anyhow. (such as 10.0.0.0/255.255.255.0)

Hope this helps.

Bill

-----Original Message-----
Message: 7
Date: Tue, 14 Oct 2008 17:21:49 +0800
From: "Nyan Myo Naing" <mp...@nu...>
Subject: Re: [Gumstix-users] ssh:  No route to host
To: <gum...@li...>
Message-ID:
	<6E7DB9984051D44D9B235574354DA37E071A2AEB@MBX03.stf.nus.edu.sg>
Content-Type: text/plain;	charset="us-ascii"


>>Dear Gumstix Users,
>>My gumstix has usb0 inet address 192.168.0.202.
>>I set my host computer 192.168.0.201.
>>Then I did
>>ssh root@192.168.0.202
>>The error is
>>root@debian:~# ssh root@192.168.0.202
>>ssh: connect to host 192.168.0.202 port 22: No route to host
>>Can I get some hints how to solve the problem?
>>Best regards,
>>Nyan


>Check your dns settings /etc/resolve.conf or whatever. (sorry in a
rush).
>Rgds,
>Drew


Hi Drew,
I checked /etc/resolve.conf at host.
But there is no address related to usb0.
I found
search nus.edu.sg
nameserver 137.132.0.254
nameserver 137.132.0.252 

rgds,
nyan