[linux-help] Re: Ethernet problem

[Ryan Claycamp <claycamp@xxxxxxxxxxxxxxxxxxxx>]

At 11:10 AM 9/1/2000 -0500, you wrote:
> Here are some questions that might help myself, others, or even you
> find the answer to the question?
>
> 1. What kind of machine is the one that you can't ping? Windows,
>    Linux, Mac, etc.
Both machines in question are running Linux

> 2. Are both machines on the same Ethernet segment (plugged in to the
>    same hub/switch)? Is there any kind of router or firewall between
>    the two?
Same hub, no router

> 3. What are the IP addresses and net masks of each?
cad1: 192.168.168.1 & 255.255.255.0
mail: 192.168.168.2 & 255.255.255.0

mail can ping cad1, but cad1 cannot ping mail

> 4. When you try to ping the one machine, does it show up in the arp
>    table on the samba server (just type arp at a root prompt)?
Here is cad1's arp table:
Address         HWtype  HWaddress           Flags Mask            Iface
ryan.lan.guernsey       ether   00:60:97:52:A3:AE   C                     eth0
mail.lan.guernsey               (incomplete)                              eth0

> 5. Can you establish any type of connection between the two, in either
>    direction? Like telnet, ssh, or something else?
Everyone, except cad1, can talk to mail.  Telnet is turned off, but ssh, 
pop, ping, etc. all get to and from mail.  I tricked cad1 into talking to 
mail by sshing into cad2 and then sshing into mail.  Mail cannot talk to 
cad1.  I just discovered that mail must think it is cad1.  I sshed from 
mail to cad1 and got mail's login screen and my directory on 
mail.  Depending on how cad1 is "feeling" connections to it can be made, 
but get dropped in a short time.  A minute or two later they can be made again.
> 6. What type of name resolution do you use? Host files, or DNS. Are
>    the host/DNS records setup correctly for both machines?
Host files.  They are correct as far as I know.

> That might be a start...
Hope this helps.

Ryan

> On Fri, Sep 01, 2000 at 10:10:18AM -0500, Ryan Claycamp wrote:
> > I have an interesting problem at work that started a few days ago.  One of
> > our file/print servers started dropping connections, both Samba and ssh
> > sessions.  It has the strange ability to ping everyone on the intranet
> > except one box.  However, that box can ping the questionable server.
> >
> > I replaced the NIC but nothing changed.  I can't think of anything that
> > would have changed; no new programs, upgrades, etc.  It just sat in the
> > corner serving files until a few days ago.  I can't find anything
> > suggestive in the logs, but maybe I don't know what to look for.  What
> > would cause a computer to be able to ping everyone, except for one
> > computer?  Could this be related to the dropped connections.
> >
> > Ryan
> > --
> > Visit the Guernsey Aviation web site: http://www.guernseyaviation.com/
> >
> >
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