unable to ping or ssh in ubuntu 9.04

Seem you need to specify a valid DNS on your configuration...

How have you set your network layer configuration as dhcp or with fixed ip... ? Please tell us something more...

Can you surf the net using Firefox...?

Thank you

I thing DNS is set properly. I have set the network layer configuration as fixed ip.. and I am able to surf the net using Firefox...

ssh -vv option outputs---
"OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
"

Hi marcobra,
I think DNS is set properly. I have set the network layer configuration as fixed ip.. and I am able to surf the net using Firefox...

ssh -vv server_name outputs---
"OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
ssh: Could not resolve hostname **************: Name or service not known
"

even if i use the ip of the ssh server,i.e. "ssh -vv server_ip" the output is----
"OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 10.20.5.2 [10.20.5.2] port 22.
debug1: connect to address 10.20.5.2 port 22: Connection timed out
ssh: connect to host 10.20.5.2 port 22: Connection timed out
"

(10.20.5.2 is the server's ip i am connecting to...)

there is definitely no problem with the server as i can ssh it from windows.

thanks

I think you must dress the ssh options...

man ssh

Using ssh in my private network... works

ssh -vv ubuntu@192.168.1.64

But with your

ssh -vv option outputs--- ubuntu@192.168.1.64

I get dns error...

 ssh -vv option outputs--- ubuntu@192.168.1.64
OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
ssh: Could not resolve hostname option: Name or service not known

Hope this helps

Plase also check the nat and port redirection rules of your router and or firewall if there are any...

Hope this helps

Hi,
10.20.5.2 is my college's server ip which is accessible only from inside the campus. thats why you cant ssh to it...besides i cannot ssh to any other server also not just 10.20.5.2.. also , "-v" option is just for more debugging information as the man pages says.

Can you please tell me some detail about the nat and port redirection rules of router / firewall u mentioned. One thing is for sure that the problem is only in my system as i am able to ssh through putty in windows (as mentioned earlier)

Thanks for ur help...

I think there is some problem in my kernel IP routing table as the destination shows 10.160.0.0 while my ip (statically set) is 10.160.0.5 and the gateway should have shown 10.160.1.1..... How do I correct this and what could be the reasons for the table showing wrong entries??

$-netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.160.0.0 0.0.0.0 255.255.254.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 10.160.1.1 0.0.0.0 UG 0 0 0 eth0

Thanx for any help ...

Hi, please ignore the above message as netstat -nr shows the same entries in my friends laptop (ubuntu 8.04) although it can successfully ping and ssh.

Please somebody help me as i have been struggling for a long time to get these working....

If it is an internal server i think you must not ( i mean: you cannot ) play with some router under your control.

Can you send here the complete terminal command you type when you try to access to it...

Thank you

:~$ ssh 10.20.5.2

and the output is "ssh: connect to host 10.20.5.2 port 22: Connection timed out"

I am using just this command. What bugs me is that it was working perfect when i was using ubuntu installed inside windows and now it doesn't. besides ssh, ping is also not working .

When I "ping google.com" it says "ping: unknown host google.com"
and when i ping google's ip i.e. "ping 66.102.9.147" the output is
 "PING 66.102.9.147 (66.102.9.147) 56(84) bytes of data.
^C
--- 66.102.9.147 ping statistics ---
134 packets transmitted, 0 received, 100% packet loss, time 133987ms
"

I am sorry if I am bothering you too much but please bear considering i am total newbie...

zagg what do you mean install inside/outside windows?
did your network use proxy?

inside windows means WUBI
outside windows means a general dual boot with windows
yes my network does use proxy.

I changed the dns and ssh has started working .... although ping for systems outside my campus still not working... all the packets are lost.. does that have something to do with the proxy. ?? ...

try set auto detect proxy/or you campus spesific proxy at
system>preference>network proxy and apply it for system wide
i think its related to proxy since you can surf through firefox, test it by
telnet google.com 80

hope this will help

i have dont that but no success.telnet google.com 80 says

"Trying 74.125.45.100...
Trying 74.125.67.100...
Trying 74.125.127.100...
telnet: Unable to connect to remote host: Connection refused"

anyways my ssh problem has been solved ..