3 computers 1-1 can't talk??? SSH or Ping

[grandrigo]

Lets say I have 3 computers all hooked up in the network:
Linux1
Linux2
LiveDuo

1. In Linux1, I can ssh and ping Linux2 with no problem
2. In Linux2, I can ssh and ping Linux1 with no problem

3. In Linux1, I can ssh and ping LiveDuo with no problem
4. In Linux2, I CAN'T ssh or ping LiveDuo ??? Why ??

I restarted ssh in Linux2 and didn't work. I also found that in arp -n the IP address of LiveDuo was listed in Linux2 so I deleted and it didn't help.
Any other suggestions??

[The Cog]

I would start by using tcpdump to watch what packets go between the machines.
Run this command on linux2 and then try the ping in another prompt:

sudo tcpdump -npe

And perhaps compare with the same test on linux1 or post the trace here if you're having difficulty with it.

Edit:
Is it possible that another PC has the same IP address as linux2, and LiveDuo is forwarding to the other one? I don't know what LiveDuo is.

[grandrigo]

LiveDuo is like a time machine but acts as another computer since I can ssh to it back and forth from linux1. Which files are specific for Ubuntu that might have that IP block or something strange?

[grandrigo]

Any other suggestions?

[grandrigo]

Hello all,
I have some trouble with my Ubuntu machine using ssh. I was wondering what files are executed/read/needed during the ssh process? For example: /etc/host.cong or ~/.ssh/*

Thanks in advance,

[Lars Noodén]

Are you talking about the client or the server?

For the client, no files are really needed, but if they exist ~/.ssh/config and /etc/ssh/ssh_config will be read.

[grandrigo]

There is something wrong with my ssh command in one of my specific computer http://ubuntuforums.org/showthread.p...6#post12859326

I was wondering what files are being accessed when I execute this command? Or what files are needed for it?
For example:
~/.ssh*
/etc/host.conf

??

[jonobr]

Hello


Just wondering what makes you think there is something wrong with the command on that computer.
I recommend running the command the cog suggested.
It should show you if ssh packets are going to the target and id they are being received.

If you really suspect ssh is a problem you could always remove and readd it

[bab1]

There is something wrong with my ssh command in one of my specific computer http://ubuntuforums.org/showthread.p...6#post12859326

Not impossible but mot likely the problem is somewhere other than ssh

I was wondering what files are being accessed when I execute this command? Or what files are needed for it?

The ssh binary is what is called. It is located at /usr/bin/ssh. You can see it by using strace. The very first this called is this: execve("/usr/bin/ssh"

For example:
~/.ssh*
/etc/host.conf

??

Not sure what the last thing is.

If you can't ping the device then you won't be able to ssh to it either. What do you get when you ping the device. Do you use the IP address or hostname?

Since this is really an extension of the first question why did you start a second thread?

[cariboo]

Please don't start multiple threads on the same subject, I have merged 3 of your threads.