Problems with Local Network

shell_ramix · n00b Joined: 03 Mar 2003 Posts: 17 Location: Mexico

Hi, I'm experimenting some problems with Local Network on my Gentoo Gateway Machine.... It's a strange behavior that is turning me crazy..!!!

I used to have my gentoo system installed along 2 years ago, 24 hrs x 365 without no mayor problems. Recently, I made up an update from the old 1.4.x profile system to a brand new 2004.3 profile. Everything was well: NATing and Routing along the Internet interface (eth0 to a ADSL line) to my local Network subsystem and services (eth1 to LAN) like samba, cups, etc, etc....(both NICs are RealTeck 8139 with 8139too driver, both tested with 2.6.10-love sources and even with 2.6.9-gentoo dev sources) When I rebooted my system with the updated -/etc- files and updated packages from the new profile system, my eth1 (Local Network Subsystem) appears apparently correct reported by ifconfig, but no communication with my inner computers was well from then. (pinging from outside to the gateway and backwards gives me a "Destination Host Unreachable" response) My routing table appears valid, my iptables script is the same and even without iptables activated, the comunication still unsuccessful ! The strange thing here is that this could not be a Kernel Level error, because the NIC plugged with the ADSL is working fine.! In fact, I have swaped the NICs each other in order to find hardware issues, but the two NIC's play well with ADSL but Not with Local Network.

If I Made a ping request to the IP address binded at local NIC from the gateway machine (eth1 - local network), this bring me successful response, but not if Im trying to communicate with my other computers to this one, even hardlinking the MAC address to the inet address via ARP from the local network computers !

I made tests with vanilla kernels as well, and the problem persist..!!! I am very desesperated now, cause I have no luck to find where the problem is !!!

PLEASE HELP !!!!

P.D. I am using "stable branch" packages at this computer, none of the "~x86 Keywords" are used here.... This is a very strange behaivour !!!!

Hope to find a quick solution !!!

pjp · Administrator Joined: 16 Apr 2002 Posts: 20586

Is the LAN NIC receiving an ip address? If not, is it configured dhcp, or static?

Posting the output of ifconfig and /etc/conf.d/net may be helpful.
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Quis separabit? Quo animo?

shell_ramix · n00b Joined: 03 Mar 2003 Posts: 17 Location: Mexico

No no, It is static... Remember this is a GATEWAY machine bringing NAT to my Local Network. The address given for this interface is 192.168.1.1 broadcasting to it's subnet 192.168.1.0.

This is the /etc/conf.d/net file:

pjp · Administrator Joined: 16 Apr 2002 Posts: 20586

EDIT: See this thread, and try using modules for your NIC if its compiled into the kernel now.

I have a vague recollection of a problem with two NICs using the same driver. Just a couple of troubleshooting suggestions since I don't recall the problem or solution.

First, configure eth0 to work as the LAN interface, and eth1 to be the public interface. Does the problem remain the same, or does it change at all?

Next, physically remove one of the NICs. Configure the remaining NIC to operate on the LAN. Does it work? Swap NICs, and verify results (both work/don't work, one does, etc.)
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Quis separabit? Quo animo?

Taladar · Posted: Wed Dec 22, 2004 8:16 pm Post subject:

I use several 8139too NICs as well and have the driver built into the kernel and it works without problems (modules work too) so I guess you recall something about a different driver.

Everything looks just fine and all evidence suggests some hardware issue. Have you tried using a differend cable?