Dual nic issues...

[John Seth]

I'm doing the ping from the server itself, and can ping that devide 
internally from another source.  The external isn't abled to be pinged 
from the server or externally...

I did try switching the cables on the cards, which if improperly 
segmented would mean both are on the internal network (hence not getting 
out on the external network), but it didn't come up with that config.

I'm thinking two things at the moment... my admin hardcoded the port to 
only accept a certain mac id, which my last network admin was notorious 
for (and I won't describe that headache)... or that the port is shot. I 
know there is at least one or two bad ports on the switch, but no one 
bothered to label or block them off, so it's a matter of hit and miss. 
Tomorrow when I go back in, I'll rerun the tests you decribe, and I'm 
going to make sure I try a few different ports, if I can find some empty 
ones.

- Tony


Dave Andruczyk wrote:
> --- John Seth <johnseth at phoenixwing.com> wrote:
> 
> 
>>I've got a temperamental old HP Netserver running slackware linux (10.1),
>>which has two ethernet cards in it.  One nic, eth1, has the internal IP of
>>192.168.1.x and a netmask of 255.255.255.0.  The second nic, eth0, is to
>>be the external connection w/ gateway.  For example... I have an IP of
>>206.x.x.4, which Class C is split in two with a netmask of
>>255.255.255.128, and gateway of 206.x.x.1.
>>
>>I can ping ANY internal IP 192.168.1.1, or whatever... but I cannot ping
>>any external IP, including the gateway IP.  I've tried setting the
>>/etc/modules.conf to alias the module for each specific card, nothing. 
>>I've switched ethernet cables around and switched the IP's for each card
>>around. The only that happens then is that the internal network becomes
>>unreachable. I check the kernel routing tables, and everything is fine...
>>ifconfig shows the correct IP and shows it as 'UP'.  However, the external
>>card shows about 24 packets TX and 0 for RX.  One card is a Tulip, the
>>other uses MII with the EEPro100 module.
>>
> 
> 
> OK where are you pinging from, the server, or a device on the internal network,
> or the external one?  (Makes a big difference)
> 
> I would first off, try 1 interface at a time.  on the server configure 1 nic to
> run (disable the config for the other one).  Set it for the internal network,
> and plug it into a switch/hub on the internal network.  ping some device ON
> that internal network from the server (see if it works), if it does go to a
> device on that internal LAN and ping the server (see if that works)
> If it does,  then adjust the configs to swap the ethernet cards. (i.e. disable
> this card and move all the configs to the other card and repeats the tests.  If
> all tests pass, then both cards seem to work OK.
> 
> Then if all tests pass (both nics work) configure ONLY the outside one (disable
> the internal)  and ping a device on theexternal subnet and from an external
> device ping the server,  if this FAILS, the port may be blocked, Offline, or on
> the wrong VLAN (if you are using them). Then you can go to your network admin.
> 
> =====
> Dave J. Andruczyk