Frustrating network issue

[Igor Pruchanskiy]

On Mon 18 Jun 2001, John Oliver wrote:
> On a machine I set up to be a firewall... Red Hat 6.2, patched, 2.2.19
> kernel, two NICs.  Worked fine with a single interface up and running at
> home and work.  When I took it to the colo room, though, it didn't. 
> After swapping cabled between interfaces, monkeying with the ifcfg-ethX
> files, etc. I finally noticed that netstat -rn showed a device for the
> default gateway as well as an address.  Even though eth0 was configured
> to be 216.120.58.10/29, the default gw 216.120.58.9 was on eth1  I
> couldn't find where that would be set, so I swapped interfaces again. 

/etc/sysconfig/network

GATEWAY=216.120.58.9
GATEWAYDEV=eth0

And yes, RedHats netowrking settings have ghosts. I have seen many many
many redhat 6.2 boxes doing that. reboot usually helped, BUT right after
the reboot network HAD to be restarted

> Still didn't work.  While troubleshooting, I found that after I pinged
> the interface on the box from the Catalyst, it started working!  Of
> course, it didn't *stay* working.  I figured that might be a NIC issue
> (the cards were 3Com 3C900s, old 10 Mb only guys).  So I bought a couple
> of NetGear FA311s (couldn't get any drivers that came with the kernel to
> work, but the drivers on the floppy worked like a charm, at least to
> bring the interfaces up), and had the same problem, except now even
> pinging from the Catalyst doesn't bring it up.  ifconfig always shows
> both interfaces running happily.  Everything that I've looked at seems
> OK.  But trying to ping anything that isn't local gets "Destination host
> unreachable".  GRRRRR!  What am I missing? :-)
> 
> -- 
> John Oliver, System Administrator        http://www.allegiancetele.com
> ConnectNet, an Allegiance Telecom company    http://www.connectnet.com
> 6370 Lusk Blvd. Ste F103                                (858) 638-2020
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> 
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> 

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