[K12OSN] new install help needed

[Terrell Prudé, Jr.]

Glad to hear it's working.  You can in fact set your DNS manually, but
if DHCP can do it for you, yep, it's easier.

However, as I suspected, there is a potential routing issue here.  Both
of your interfaces are in the 192.168.0.0/24 subnet.  That's bad news,
because you may find in the future that your server doesn't know which
packets to route out which interface.  It is possible that your server
could send out half the X11 packets out eth0 and the other half out
eth1!

The last time I made this particular mistake, which was with K12LTSP
4.2.1 (FC3-based) and a very late night so that I was tired (that's my
story and I'm stickin' to it), my clients could connect to my server
just fine, but my server couldn't get out.  Why?  My main LAN also
happens to use 192.168.0.0/24, and eth1 was configured for DHCP (the
default K12LTSP setting).  The server thought that the default gateway
for my network, 192.168.0.1, was reachable from eth0 and thus sent
packets out eth0 to the Internet!  Oops....

Did I mention that I was really, REALLY tired that night?  :-)  

Note that many home routers are pre-configured for 192.168.0.0/24.  The
problem is that the K12LTSP default on eth0 is also 192.168.0.0/24.
Thus, you have *two* possible paths to the default gateway--eth0 *and*
eth1.  Now the server's gotta pick which one.  Basically, you got lucky,
because, as your netstat -rn output shows, your server happened to
choose eth1, but don't expect to be able to hook up a thick client to
your eth0 segment and have things work.  What should be done during a
dual-NIC LTSP server of any sort (including K12LTSP) is to choose an IP
subnet for the clients that is different from the main LAN.  The server
that I use for demos at schools currently uses 172.31.0.0/24, since
nobody seems to choose that range (fingers crossed!).

BTW, despite the existence of OpenOffice.org, it's probably a good idea
to submit attachments in something other than the proprietary MS Word
doc format (e. g. RTF or even plain text).  This is, after all, a Free
Software mailing list.  :-)

--TP
--Microsoft Free Since 2003

On Sun, 2005-11-06 at 14:28 -0500, Dick Kempton wrote:

> Thank you for your reply.  It seems that by not automatically setting
> the DNS, all is well. Thanks again. This was a small but bugging
> problem.
> 
>  
> 
> -----Original Message-----
> From: k12osn-bounces at redhat.com [mailto:k12osn-bounces at redhat.com]On
> Behalf Of Terrell Prudй, Jr.
> Sent: Sunday, November 06, 2005 11:40 AM
> To: Support list for opensource software in schools.
> Subject: Re: [K12OSN] new install help needed
> 
>  
> 
> On Sun, 2005-11-06 at 11:25 -0500, Dick Kempton wrote:
> 
> 
> 
> I recently installed version 4.4.1 on my computer that only had one
> NIC. All worked fine and I was able to connect to my Road Runner
> connection thru a cable modem.  
> 
>  
> 
> When I installed a second NIC, a 3com 3cSOHO100-TX, the default set up
> connected to my client computer correctly.  But…now neither client nor
> server can connect to Internet.  Eth1 is set to DHCP and eth0 is set
> statically to 192.168.0.254.
> 
>  
> 
> I even did a fresh install with both cards installed and used all of
> the defaults.  I still have no Internet access. How can I get eth1 to
> connect as it did previously before the second card was installed???
> 
>  
> 
> Thanks for any help.
> 
>  
> 
> DK
> 
> 
> Shoot us a copy of your "/sbin/ifconfig" and "netstat -rn" outputs.  I
> suspect a routing issue.
> 
> --TP 
> 


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