Lost Connectivity DSL Static IP Red Hat 6.2
 

Help! Some how on Saturday I lost connectivity to the Internet. Had no problem for over a year and then for some reason it I lost connectivity.

Ran ifconfig eth0 and it shows as up. Try pinging several addresses, all %100 packet loss

Ran ifconfig eth0 down. Try pinging again, now says Connect: Network unreachable

Ran ifup eth0. Try pinging several addresses, all %100 packet loss.

UP BROADCAST RUNNING MTU 1500 Metric 0
RX packets 0 errors 0 dropped 0 overrun 0
TX packets 1110 errors 0 dropped 0 overrun 1110 <--- Does overrun tell me something?

From this I assume my NIC is good? Is there another way to test the NIC card?

Triple checked my network configuration. Looks the same as it has for over a year.

IP is good, DSL line is good (I have 2 IPs, one for Linux one for windows box. I switched IP addresses and re-booted windows, came up no problem.) I can ping (from windows) the DNS servers.

Any ideas or suggestions?

TIA

-Ward

hUMM
 

Well first always try the simplist.

I guess your setup through a hub or even a switch. Check to see if the ports on them are still good. Check the cable. Can you even ping the windoze box( they should by assumption be on the same subnet).

The card seems to be receiving bad packets. Also try netstat -n to see if its listing to somthing

Thx for the response.

OK,

Pinging my windows box I get DESTINATION HOST UNREACHABLE

I switched the cable line to windows and works fine. Switched port on the DSL router, again it works fine with my windows connection


# netstat ?r (note this is hand copied)

Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
64.81.50.241 * 255.255.255.255 UH 0 0 0 eth0
64.81.50.0 * 255.255.255.0 U 00 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 64.81.50.1 0.0.0.0 UG 0 0 0 eth0
default 64.81.50.1 0.0.0.0 UG 0 0 0 eth0

TIA

Test if NIC card is good
 

Does anyone know how to dertermine if a NIC card is good other than what I posted yesterday? I have an Intel PCI EtherExpress Pro 100 ( 82557 controller )

TIA

-Can you ping the localhost (127.0.0.1)?
-Can you ping the card's IP?
-Can you ping the card's IP from the windows box?
-Have you reset the DSL router and verified its setup?

-Setup and diagnostic utilities for PCI Ethernet cards can be found at
Scyld.

What exactly were you doing on the box just prior to your connection failure?
I know the answer to this question is always: "Nothing at all", but think carefully...
;)

<<-Can you ping the localhost (127.0.0.1)?

yes

<<-Can you ping the card's IP?

Barely. Sent 296 packets, 4 received, 98% packet loss
Time 0.1 ms
Time 79000.2 ms
Time 158000.1 ms --I know that is not right, but what does that tell me?

<<-Can you ping the card's IP from the windows box?

No

<<-Have you reset the DSL router and verified its setup?

I have recycled it several time. Windows IP works fine. One DSL line into router, 4 ports; one to Linux, one to windows. Have switched ports and cables between the two. Windows works, Linux don?t


<<What exactly were you doing on the box just prior to your connection failure?
<<I know the answer to this question is always: "Nothing at all", but think carefully...

I configured sendmail about 2 months ago. It along with everything else was working fine.

I DID un-plug the Ethernet cable to hook up my laptop for about 30 minutes on Saturday. I can?t see how that would affect my connectivity.

TIA

No, neither can I; maybe your NIC really has gone belly-up. Did you try any of the diagnostics from scyld that I linked to in my last post? I haven't had to use them myself, but they look like they could help eliminate some of the variables.

It was the NIC!!
 

Thanks guys for the help & input. Turns out it WAS the NIC card after all!

Thanks again!

-Ward