[NBLUG/talk] Networking newbie

[Dean A. Roman]

William,

  I'm not sure how your pinging, but it sounds like your doing a 
broadcast ping (ping 10.0.0.255) which will just about always return 
packets because your sending the ping to every host on the network.

To help out more, you should include the following info:
-  ifconfig from each box
-  actual command line you are trying to run and from what box.


Here is a good starting point in Debian to configure 
interfaces/networks/routes...it's not the purist approach using ifconfig 
however it does use the debian mechanism for bringing interfaces up and 
down.

#On the server (I'm assuming your gateway/router is 10.0.0.1..change it 
to whatever it really is):
vi /etc/network/interfaces
#ENTER THIS INFO INTO FILE==>
   auto eth0
   iface eth0 inet static
        address 10.0.0.12
        netmask 255.255.255.0
        network 10.0.0.0
        broadcast 10.0.0.255
        gateway 10.0.0.1

#TO START THE INTERFACE
ifup eth0

#TO STOP THE INTERFACE
ifdown eth0

#TO VIEW ROUTES
netstat -rn
  or
route

#TO RUN TEST PINGS
#FROM WORKSTATION/CLIENT (the machine getting a dhcp address)
#This will test connectivity between the two machines
ping 10.0.0.12

#FROM THE SERVER MACHINE (the machine running dhcpd)
# x.x.x.x is whatever the dhcp server handed out to the client machine 
(probably 10.0.0.200)
ping x.x.x.x

#TO SSH FROM MACHINE TO MACHINE
#MAKE SURE sshd in config file /etc/ssh/sshd_config is set to allow 
connections from outside the localhost by setting "ListenAddress 0.0.0.0".
#MAKE SURE SSHD IS RUNNING (ps -ax | grep "sbin/sshd" | grep -v 
grep)...There's probably an easier way to do this
# IF NOT, THEN START IT  (/etc/init.d/sshd start)
#FROM WORKSTATION/CLIENT
ssh 10.0.0.12
#FROM THE SERVER (replace x.x.x.x with the actually address et. 10.0.0.200)
ssh x.x.x.x

#TO CHANGE THE hostname to work correctly when doing "hostname -i"
vi /etc/hosts
#CHANGE IN FILE
#OLD LINE# 127.0.0.1  localhost   servername
#NEW LINE# 127.0.0.1  localhost
#NEW LINE#10.0.0.12  servername

#MAKE SURE "/etc/hostname" has the correct name in it.


I hope that helped,
   ---Dean.



A'fish'ionado wrote:

>>ifconfig eth0 10.0.0.12 netmask 255.255.255.0 broadcast 10.0.0.255
>>    
>>
>
>There we go. :-)
>
>OK, I'm to the point where I have a network of two Debian boxes. I
>fire up the server, and it gets the address 10.0.0.255. ifup eth0 on
>the laptop registers it on the network as 10.0.0.200. Each box can ssh
>into itself on its address.
>
>However, when I try to ssh into the opposite box, I fail.
>
>Right now, the laptop gives me:
>ssh: connect to host 10.0.0.255 post 22: Network is unreachable
>
>The desktop/server gives me:
>ssh: connect to host 10.0.0.200 port 22: No route to host
>
>At the moment, though, I seem to be able to ping each box from the
>other, which is a good sign. :-)
>
>Finally--hostname -i still prints 127.0.0.1 on each box. Is this
>fixable/something to worry about?
>
>I'm *almost* there. ;-) Thanks for bearing with me instead of justing
>yelling at me to RTFM.
>
>William
>
>_______________________________________________
>talk mailing list
>talk at nblug.org
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>
>
>  
>

-- 
Dean A. Roman
President
Roman Computer Systems
Office: 707-237-6798
Fax   : 707-237-2649
E-mail: droman at romansys.com
Web   : http://www.romansys.com