eth0 does not see other nodes
 

Dear linux gurus,

I have a linuxbox (REDHAT 8.0) that has two ethernet cards. eth1 points to the "world" and eth0 points to a switch box that has seven other nodes with linux also connected. The problem is that although the eth1 connection works perfectly well, eth0 does not see any node. I have switch off firewall but this did not help. The strange think is that when I fisrt installed REDHAT8.0 evrything worked fine but after about two weeks the problems started to arise.

The configuration of the etherenet cards is:

eth0 Link encap:Ethernet HWaddr 00:C1:28:01:8F:41
inet addr:10.0.0.1 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:221 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 b) TX bytes:19246 (18.7 Kb)
Interrupt:11 Base address:0xf000

eth1 Link encap:Ethernet HWaddr 00:C1:28:01:87:3C
inet addr:195.251.6.169 Bcast:195.251.6.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:69621 errors:0 dropped:0 overruns:0 frame:0
TX packets:51514 errors:0 dropped:0 overruns:0 carrier:0
collisions:7364 txqueuelen:100
RX bytes:28799073 (27.4 Mb) TX bytes:26536982 (25.3 Mb)
Interrupt:5 Base address:0x1000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:289 errors:0 dropped:0 overruns:0 frame:0
TX packets:289 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:24836 (24.2 Kb) TX bytes:24836 (24.2 Kb)

Any help would be greatly appreciated.


Demetres

Moved: This thread is more suitable in Linux-Networking and has been moved accordingly to help your thread/question get the exposure it deserves.

What are the IP addresses/subnet masks of the other computers?

Two things I see right right off the bat:

1) eth0 has a Class A subnet mask (255.0.0.0). That's why I was wondering about the other computer's IP addresses.

2) eth0 isn't receiving any packets. Might have something to do with the subnet mask, but would need more information first.

The network juts came back!!!!!!!!!! for eth0 on its own!!!!!!!!!!!!!!

For a node here is the information from ifconfig:

eth0 Link encap:Ethernet HWaddr 00:C1:28:01:8F:EF
inet addr:10.0.0.2 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:563660 errors:0 dropped:0 overruns:0 frame:0
TX packets:1503337 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:11 Base address:0xd000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:679 errors:0 dropped:0 overruns:0 frame:0
TX packets:679 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0

OK, so does that mean you're all set, or do you still need help?

Thus, far I am O.K.

Many thanks for all your effort. However, the mystery of waht happened still remains unsolved. But since everything is working I do not bother.